{"id":232,"date":"2025-10-31T00:25:51","date_gmt":"2025-10-31T00:25:51","guid":{"rendered":"https:\/\/vibromera.eu\/glossary\/shaft-bow\/"},"modified":"2026-05-23T23:06:20","modified_gmt":"2026-05-23T23:06:20","slug":"shaft-bow","status":"publish","type":"glossary","link":"https:\/\/vibromera.eu\/mr\/glossary\/shaft-bow\/","title":{"rendered":"What is Shaft Bow? Causes, Detection, and Correction"},"content":{"rendered":"<h1>\u092b\u093f\u0930\u0923\u093e\u0931\u094d\u092f\u093e \u092f\u0902\u0924\u094d\u0930\u0938\u093e\u092e\u0917\u094d\u0930\u0940\u0924\u0940\u0932 \u0936\u093e\u092b\u094d\u091f \u092c\u094b \u0938\u092e\u091c\u0942\u0928 \u0918\u0947\u0923\u0947<\/h1>\n\t\t<section class=\"woocommerce hestia-shop products is-shortcode\" id=\"products\" data-sorder=\"hestia_shop\" >\n\t\t\t\t\t\t<div class=\"\">\n\t\t\t\t\t\t<div class=\"hestia-shop-content\">\n\t\t\t<div class=\"row\" data-aos=\"fade-up\" >\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/balanset-1\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/balanset-1\/\" title=\"\u092a\u094b\u0930\u094d\u091f\u0947\u092c\u0932 \u092c\u0945\u0932\u0928\u094d\u0938\u0930 \u0906\u0923\u093f \u0915\u0902\u092a\u0928 \u0935\u093f\u0936\u094d\u0932\u0947\u0937\u0915 Balanset-1A\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A \u0938\u0902\u092a\u0942\u0930\u094d\u0923 \u0915\u093f\u091f \u092a\u094b\u0930\u094d\u091f\u0947\u092c\u0932 \u0938\u0902\u0924\u0941\u0932\u0915 \u0906\u0923\u093f \u0915\u0902\u092a\u0928 \u0935\u093f\u0936\u094d\u0932\u0947\u0937\u0915\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-272x182.webp 272w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mr\/product-category\/devices\/\" rel=\"tag\">Devices<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mr\/product\/balanset-1\/\" title=\"\u092a\u094b\u0930\u094d\u091f\u0947\u092c\u0932 \u092c\u0945\u0932\u0928\u094d\u0938\u0930 \u0906\u0923\u093f \u0915\u0902\u092a\u0928 \u0935\u093f\u0936\u094d\u0932\u0947\u0937\u0915 Balanset-1A\">\u092a\u094b\u0930\u094d\u091f\u0947\u092c\u0932 \u092c\u0945\u0932\u0947\u0928\u094d\u0938\u0930 &#038; \u0935\u094d\u0939\u093e\u092f\u092c\u094d\u0930\u0947\u0936\u0928 \u0905\u200d\u0945\u0928\u093e\u0932\u093e\u092f\u091d\u0930 Balanset-1A<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>1,975.00<\/span> + VAT (\u0932\u093e\u0917\u0942 \u0905\u0938\u0932\u094d\u092f\u093e\u0938)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mr\/wp-json\/wp\/v2\/glossary\/232?add-to-cart=986\" data-quantity=\"1\" data-product_id=\"986\" data-product_sku=\"BS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mr\/wp-json\/wp\/v2\/glossary\/232?add-to-cart=986\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_986\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"986\" data-product_sku=\"BS-1\" aria-label=\"Add to cart: \u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d\" rel=\"nofollow\" data-success_message=\"\u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_986\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/vibration-sensor\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/vibration-sensor\/\" title=\"\u0915\u0902\u092a\u0928 \u0938\u0902\u0935\u0947\u0926\u0915\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A \u0915\u0902\u092a\u0928 \u0938\u0902\u0935\u0947\u0926\u0928\u0936\u0940\u0932 \u091c\u0935\u0933\u0942\u0928\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3.webp 1280w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mr\/product-category\/parts\/\" rel=\"tag\">Parts<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mr\/product\/vibration-sensor\/\" title=\"\u0915\u0902\u092a\u0928 \u0938\u0902\u0935\u0947\u0926\u0915\">\u0915\u0902\u092a\u0928 \u0938\u0902\u0935\u0947\u0926\u0915<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>90.00<\/span> + VAT (\u0932\u093e\u0917\u0942 \u0905\u0938\u0932\u094d\u092f\u093e\u0938)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mr\/wp-json\/wp\/v2\/glossary\/232?add-to-cart=1820\" data-quantity=\"1\" data-product_id=\"1820\" data-product_sku=\"VS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mr\/wp-json\/wp\/v2\/glossary\/232?add-to-cart=1820\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1820\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1820\" data-product_sku=\"VS-1\" aria-label=\"Add to cart: \u201cVibration sensor\u201d\" rel=\"nofollow\" data-success_message=\"\u201cVibration sensor\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1820\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/optical-sensor-for-balanset-and-arbalance\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"\u0911\u092a\u094d\u091f\u093f\u0915\u0932 \u0938\u0947\u0928\u094d\u0938\u0930 (\u0932\u0947\u091d\u0930 \u091f\u0945\u0915\u094b\u092e\u0940\u091f\u0930)\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"\u0911\u092a\u094d\u091f\u093f\u0915\u0932 \u0938\u0947\u0928\u094d\u0938\u0930 (\u0932\u0947\u091d\u0930 \u091f\u0945\u0915\u094b\u092e\u0940\u091f\u0930)\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-1536x1023.webp 1536w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU.webp 1600w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mr\/product-category\/parts\/\" rel=\"tag\">Parts<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mr\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"\u0911\u092a\u094d\u091f\u093f\u0915\u0932 \u0938\u0947\u0928\u094d\u0938\u0930 (\u0932\u0947\u091d\u0930 \u091f\u0945\u0915\u094b\u092e\u0940\u091f\u0930)\">\u0911\u092a\u094d\u091f\u093f\u0915\u0932 \u0938\u0947\u0928\u094d\u0938\u0930 (\u0932\u0947\u091d\u0930 \u091f\u0945\u0915\u094b\u092e\u0940\u091f\u0930)<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>124.00<\/span> + VAT (\u0932\u093e\u0917\u0942 \u0905\u0938\u0932\u094d\u092f\u093e\u0938)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mr\/wp-json\/wp\/v2\/glossary\/232?add-to-cart=1832\" data-quantity=\"1\" data-product_id=\"1832\" data-product_sku=\"Tach-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mr\/wp-json\/wp\/v2\/glossary\/232?add-to-cart=1832\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1832\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1832\" data-product_sku=\"Tach-1\" aria-label=\"Add to cart: \u201cOptical Sensor (Laser Tachometer)\u201d\" rel=\"nofollow\" data-success_message=\"\u201cOptical Sensor (Laser Tachometer)\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1832\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/balanset-4\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/balanset-4\/\" title=\"Balanset-4\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Vibromera \u0930\u094b\u091f\u0930 \u0938\u0902\u0924\u0941\u0932\u0928 \u0915\u093f\u091f: \u0935\u0939\u0928 \u0915\u0947\u0938, \u092c\u0939\u0941-\u091a\u0945\u0928\u0932 \u0938\u093f\u0917\u094d\u0928\u0932 \u0915\u0902\u0921\u093f\u0936\u0928\u0930, \u0939\u093e\u0925 \u092a\u0915\u0921\u0928\u0947 \u0935\u093e\u0932\u0940 \u0935\u093f\u0936\u094d\u0932\u0947\u0937\u0915, \u091a\u0941\u0902\u092c\u0915\u0940\u092f \u0906\u0927\u093e\u0930, \u0915\u0902\u092a\u0928 \u0938\u0902\u0935\u0947\u0926\u0915, \u0906\u0923\u093f \u0915\u0949\u0907\u0932 \u0915\u0947\u092c\u0932.\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4.webp 640w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mr\/product-category\/devices\/\" rel=\"tag\">Devices<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mr\/product\/balanset-4\/\" title=\"Balanset-4\">Balanset-4<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>6,803.00<\/span> + VAT (\u0932\u093e\u0917\u0942 \u0905\u0938\u0932\u094d\u092f\u093e\u0938)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mr\/wp-json\/wp\/v2\/glossary\/232?add-to-cart=1833\" data-quantity=\"1\" data-product_id=\"1833\" data-product_sku=\"BS-4\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mr\/wp-json\/wp\/v2\/glossary\/232?add-to-cart=1833\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1833\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1833\" data-product_sku=\"BS-4\" aria-label=\"Add to cart: \u201cBalanset-4\u201d\" rel=\"nofollow\" data-success_message=\"\u201cBalanset-4\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1833\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div><!-- \/.row --><div class=\"row\">\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/magnet-stand\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/magnet-stand\/\" title=\"\u092e\u0945\u0917\u094d\u0928\u0947\u091f\u093f\u0915 \u0938\u094d\u091f\u0901\u0921 Insize-60-kgf\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Magnet base.\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36.webp 1280w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mr\/product-category\/parts\/\" rel=\"tag\">Parts<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mr\/product\/magnet-stand\/\" title=\"\u092e\u0945\u0917\u094d\u0928\u0947\u091f\u093f\u0915 \u0938\u094d\u091f\u0901\u0921 Insize-60-kgf\">\u092e\u0945\u0917\u094d\u0928\u0947\u091f\u093f\u0915 \u0938\u094d\u091f\u0901\u0921 Insize-60-kgf<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>46.00<\/span> + VAT (\u0932\u093e\u0917\u0942 \u0905\u0938\u0932\u094d\u092f\u093e\u0938)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mr\/wp-json\/wp\/v2\/glossary\/232?add-to-cart=1852\" data-quantity=\"1\" data-product_id=\"1852\" data-product_sku=\"MS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mr\/wp-json\/wp\/v2\/glossary\/232?add-to-cart=1852\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1852\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1852\" data-product_sku=\"MS-1\" aria-label=\"Add to cart: \u201cMagnetic Stand Insize-60-kgf\u201d\" rel=\"nofollow\" data-success_message=\"\u201cMagnetic Stand Insize-60-kgf\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1852\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/reflective-tape\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/reflective-tape\/\" title=\"\u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0915 \u091f\u0947\u092a\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"\u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0915 \u091f\u0947\u092a\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-16x12.webp 16w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-272x182.webp 272w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mr\/product-category\/parts\/\" rel=\"tag\">Parts<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mr\/product\/reflective-tape\/\" title=\"\u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0915 \u091f\u0947\u092a\">\u092a\u0930\u093e\u0935\u0930\u094d\u0924\u0915 \u091f\u0947\u092a<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>10.00<\/span> + VAT (\u0932\u093e\u0917\u0942 \u0905\u0938\u0932\u094d\u092f\u093e\u0938)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mr\/wp-json\/wp\/v2\/glossary\/232?add-to-cart=2329\" data-quantity=\"1\" data-product_id=\"2329\" data-product_sku=\"rt-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mr\/wp-json\/wp\/v2\/glossary\/232?add-to-cart=2329\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_2329\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"2329\" data-product_sku=\"rt-1\" aria-label=\"Add to cart: \u201cReflective tape\u201d\" rel=\"nofollow\" data-success_message=\"\u201cReflective tape\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_2329\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/dynamic-balancer-balanset-1a\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/mr\/product\/dynamic-balancer-balanset-1a\/\" title=\"\u0921\u093e\u092f\u0928\u093e\u092e\u093f\u0915 \u092c\u0945\u0932\u0928\u094d\u0938\u0930 \u201cBalanset-1A\u201d OEM\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A \u0915\u093f\u091f \u0938\u093e\u092e\u0917\u094d\u0930\u0940 \u0907\u0902\u091f\u0930\u092b\u0947\u0938 \u092f\u0941\u0928\u093f\u091f, \u0938\u0902\u0935\u0947\u0926\u0915, \u091f\u0945\u0915\u094b\u092e\u0940\u091f\u0930 \u0906\u0923\u093f \u0905\u0928\u0941\u0937\u0902\u0917\u0940 \u0938\u0939\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-1024x683.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-1536x1024.webp 1536w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-2048x1366.webp 2048w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-e1732998877834.webp 708w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/mr\/product-category\/devices\/\" rel=\"tag\">Devices<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/mr\/product\/dynamic-balancer-balanset-1a\/\" title=\"\u0921\u093e\u092f\u0928\u093e\u092e\u093f\u0915 \u092c\u0945\u0932\u0928\u094d\u0938\u0930 \u201cBalanset-1A\u201d OEM\">\u0921\u093e\u092f\u0928\u093e\u092e\u093f\u0915 \u092c\u0945\u0932\u0928\u094d\u0938\u0930 \u201cBalanset-1A\u201d OEM<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>1,735.00<\/span> + VAT (\u0932\u093e\u0917\u0942 \u0905\u0938\u0932\u094d\u092f\u093e\u0938)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/mr\/wp-json\/wp\/v2\/glossary\/232?add-to-cart=4193\" data-quantity=\"1\" data-product_id=\"4193\" data-product_sku=\"BS-1OEM\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/mr\/wp-json\/wp\/v2\/glossary\/232?add-to-cart=4193\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_4193\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"4193\" data-product_sku=\"BS-1OEM\" aria-label=\"Add to cart: \u201cDynamic balancer \u201cBalanset-1A\u201d OEM\u201d\" rel=\"nofollow\" data-success_message=\"\u201cDynamic balancer \u201cBalanset-1A\u201d OEM\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_4193\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/section>\n\t\t\n<p><strong>\u0936\u093e\u092b\u094d\u091f \u092c\u094b<\/strong> (\u092f\u093e\u0932\u093e shaft bending, rotor bow, \u0915\u093f\u0902\u0935\u093e \u092b\u0915\u094d\u0924 &#8220;bow&#8221; \u0905\u0938\u0947\u0939\u0940 \u092e\u094d\u0939\u0923\u0924\u093e\u0924) \u0939\u0940 \u0905\u0936\u0940 \u0905\u0935\u0938\u094d\u0925\u093e \u0906\u0939\u0947 \u091c\u094d\u092f\u093e\u092e\u0927\u094d\u092f\u0947 <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/rotor\/\">rotor<\/a> shaft has developed a permanent or semi-permanent curvature, causing its geometric centreline to deviate from a straight line between the bearing journals. Unlike temporary <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/run-out\/\">\u0930\u0928-\u0906\u0909\u091f<\/a> caused by a loose component or an eccentric mounting, shaft bow represents an actual deformation of the shaft material itself. It produces <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/vibration\/\">vibration<\/a> \u0935\u0930\u0935\u0930 \u092a\u093e\u0939\u0924\u093e \u091c\u094d\u092f\u093e\u0902\u091a\u0940 \u0932\u0915\u094d\u0937\u0923\u0947 \u0938\u093e\u092e\u094d\u092f \u0926\u093e\u0916\u0935\u0924\u093e\u0924 <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/unbalance\/\">unbalance<\/a> \u2014 strong, synchronous, once-per-revolution motion \u2014 yet it cannot be cured by conventional <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/balancing\/\">balancing<\/a>. Recognising that distinction early is what separates a quick repair from days of fruitless balancing on a shaft that was never going to respond.<\/p>\n<h2>1. \u0935\u094d\u092f\u093e\u0916\u094d\u092f\u093e: \u0936\u093e\u092b\u094d\u091f \u092c\u094b \u0916\u0930\u094b\u0916\u0930 \u0915\u093e\u092f \u0906\u0939\u0947<\/h2>\n<p>A perfectly healthy rotor has a mass axis and a geometric axis that are both straight and very nearly coincident. Shaft bow breaks that picture by bending the geometric axis into an arc. The bend may be small \u2014 a few hundredths of a millimetre is enough to matter on a high-speed machine \u2014 but because the bowed centreline no longer passes through the bearing centres, the rotor is forced to whirl about a line it does not naturally want to spin around.<\/p>\n<p>It is worth separating bow from its close relatives. A <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/bent-shaft\/\">\u0935\u093e\u0915\u0932\u0947\u0932\u093e \u0936\u093e\u092b\u094d\u091f<\/a> is essentially the same fault described from the mechanical side, while <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/eccentricity\/\">\u0935\u093f\u0915\u0947\u0902\u0926\u094d\u0930\u0924\u093e<\/a> describes a rotor whose mass centre is offset without the shaft itself being curved. True <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/run-out\/\">\u0930\u0928-\u0906\u0909\u091f<\/a> can be mechanical (a real geometric deviation) or electrical (a false reading from a <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/proximity-probe\/\">\u0938\u092e\u0940\u092a\u0924\u093e \u091c\u093e\u091a<\/a> \u0938\u093e\u0939\u093f\u0924\u094d\u092f \u0915\u093f\u0902\u0935\u093e magnetic variation \u0913\u0933\u0916\u0923\u093e\u0931\u094d\u092f\u093e signal\u092e\u0941\u0933\u0947 \u0905\u0938\u0947 \u0926\u093f\u0938\u0942 \u0936\u0915\u0924\u0947. Shaft bow \u0939\u0940 \u0935\u093f\u0936\u0947\u0937\u0924\u0903 shaft body\u091a\u0940 geometric deformation \u0905\u0938\u0924\u0947, \u0906\u0923\u093f \u092e\u094d\u0939\u0923\u0942\u0928\u091a \u0907\u0924\u0930\u0924\u094d\u0930 \u0905\u0924\u093f\u0930\u093f\u0915\u094d\u0924 mass \u0935\u093e\u0922\u0935\u0942\u0928 \u0924\u0947 \u0916\u0930\u094b\u0916\u0930 &#8220;\u092d\u0930\u0942\u0928 \u0928\u093f\u0918\u0947\u0932 \u0907\u0924\u0915\u0947 \u0938\u0902\u0924\u0941\u0932\u093f\u0924&#8221; \u0915\u0930\u0924\u093e \u092f\u0947\u0924 \u0928\u093e\u0939\u0940.<\/p>\n<h2>2. \u0936\u093e\u092b\u094d\u091f \u0927\u0928\u0941\u0937\u094d\u092f\u093e\u091a\u0947 \u092a\u094d\u0930\u0915\u093e\u0930<\/h2>\n<p>Shaft bow is best categorised by its cause and how long it persists, because each type calls for a different response.<\/p>\n<h3>2.1 Permanent Mechanical Bow<\/h3>\n<p>This is plastic (permanent) deformation of the shaft material \u2014 the metal has yielded and will not spring back. Common origins include:<\/p>\n<ul>\n<li>\u092f\u093e\u0902\u0924\u094d\u0930\u093f\u0915 \u0905\u0924\u093f\u092d\u093e\u0930 \u0915\u093f\u0902\u0935\u093e \u0906\u0918\u093e\u0924<\/li>\n<li>\u0926\u0947\u0916\u092d\u093e\u0932\u0940\u0926\u0930\u092e\u094d\u092f\u093e\u0928 \u0905\u092f\u094b\u0917\u094d\u092f \u0909\u091a\u0932 \u0915\u093f\u0902\u0935\u093e \u0939\u093e\u0924\u093e\u0933\u0923\u0940<\/li>\n<li>\u0930\u094b\u091f\u0930 \u092a\u0921\u0923\u0947<\/li>\n<li>\u0915\u093e\u0930\u094d\u092f\u0930\u0924 \u0905\u0938\u0924\u093e\u0928\u093e \u0905\u0924\u093f\u091c\u093e\u0938\u094d\u0924 \u0935\u093e\u0915\u0923\u093e\u0930\u093e \u0924\u093e\u0923<\/li>\n<li>\u0909\u0924\u094d\u092a\u093e\u0926\u0928\u093e\u0924\u0940\u0932 \u0926\u094b\u0937 \u0915\u093f\u0902\u0935\u093e \u0905\u092f\u094b\u0917\u094d\u092f \u0909\u0937\u094d\u0923\u0924\u093e-\u0909\u092a\u091a\u093e\u0930<\/li>\n<\/ul>\n<p>Once the shaft has yielded, the bow remains even when the shaft is at rest and every external load has been removed. This is the signature that separates permanent bow from the thermal kind: it is present cold, and it is present on the bench.<\/p>\n<h3>2.2 Thermal Bow (Transient)<\/h3>\n<p>\u092f\u093e\u0932\u093e \u0905\u0938\u0947\u0939\u0940 \u092e\u094d\u0939\u0923\u0924\u093e\u0924 <strong>\u0925\u0930\u094d\u092e\u0932 \u092c\u094b<\/strong> or <strong>\u0939\u0949\u091f \u092c\u094b<\/strong>, this is a temporary condition caused by uneven heating around the shaft circumference. The hotter side expands more than the cooler side, forcing the shaft into a curve with the hot side on the convex (outer) face. Typical triggers are:<\/p>\n<ul>\n<li>\u0905\u0938\u092e\u092e\u093f\u0924 \u0909\u0937\u094d\u0923\u0924\u093e-\u0938\u094d\u0930\u094b\u0924 (\u090f\u0915\u093e \u092c\u093e\u091c\u0942\u0932\u093e \u0917\u0930\u092e process fluid, \u0926\u0941\u0938\u0931\u094d\u092f\u093e \u092c\u093e\u091c\u0942\u0932\u093e \u0925\u0902\u0921 \u0915\u0930\u0923\u093e\u0930\u0940 \u0939\u0935\u093e)<\/li>\n<li>\u092c\u0947\u0905\u0930\u093f\u0902\u0917 \u0918\u0930\u094d\u0937\u0923\u093e\u092e\u0941\u0933\u0947 \u0936\u093e\u092b\u094d\u091f\u091a\u0940 \u090f\u0915 \u092c\u093e\u091c\u0942 \u0917\u0930\u092e \u0939\u094b\u0923\u0947<\/li>\n<li>Rotor rubs generating localised heating<\/li>\n<li>\u092c\u093e\u0939\u0947\u0930\u0940\u0932 \u0909\u092a\u0915\u0930\u0923\u093e\u0902\u0935\u0930 \u0938\u094c\u0930 \u0924\u093e\u092a\u092e\u093e\u0928\u0935\u093e\u0922<\/li>\n<li>\u092e\u094b\u0920\u094d\u092f\u093e \u091f\u0930\u094d\u092c\u093e\u0907\u0928\u0938\u093e\u0920\u0940 \u0905\u092f\u094b\u0917\u094d\u092f \u0935\u0949\u0930\u094d\u092e-\u0905\u092a \u092a\u0926\u094d\u0927\u0924\u0940<\/li>\n<\/ul>\n<p>Thermal bow normally disappears once the shaft cools uniformly or reaches thermal equilibrium. The full mechanism, prevention, and turning-gear practice are covered in depth under <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/thermal-bow\/\">\u0925\u0930\u094d\u092e\u0932 \u092c\u094b<\/a>. \u092f\u0947\u0925\u0947 \u092e\u0939\u0924\u094d\u0924\u094d\u0935\u093e\u091a\u0940 \u0938\u0942\u091a\u0928\u093e \u0905\u0936\u0940 \u0906\u0939\u0947 \u0915\u0940 repeated thermal-bow cycles \u092e\u0941\u0933\u0947 \u0936\u0947\u0935\u091f\u0940 shaft \u0924\u094d\u092f\u093e\u091a\u094d\u092f\u093e yield point\u092a\u0932\u0940\u0915\u0921\u0947 \u091c\u093e\u090a \u0936\u0915\u0924\u094b \u0906\u0923\u093f \u0924\u094d\u092f\u093e\u0924 permanent set \u0930\u093e\u0939\u0942 \u0936\u0915\u0924\u094b \u2014 \u0924\u094d\u092f\u093e\u092e\u0941\u0933\u0947 \u092c\u0930\u093e\u091a \u0915\u093e\u0933 \u0926\u0941\u0930\u094d\u0932\u0915\u094d\u0937\u093f\u0924 \u0915\u0947\u0932\u0947\u0932\u0940 &#8220;\u0924\u093e\u0924\u094d\u092a\u0941\u0930\u0924\u0940&#8221; \u0938\u092e\u0938\u094d\u092f\u093e \u0915\u093e\u092f\u092e\u091a\u0940 \u092c\u0928\u0924\u0947.<\/p>\n<h3>2.3 \u0905\u0935\u0936\u093f\u0937\u094d\u091f \u0924\u093e\u0923 \u0927\u0928\u0941\u0937\u094d\u092f<\/h3>\n<p>Internal residual stresses left by welding, heat treatment, or machining can cause a shaft to bow slowly over time, particularly when service temperatures or operating loads allow those locked-in stresses to relax. This kind of bow can appear months or years after commissioning, which makes periodic straightness checks worthwhile on critical rotors.<\/p>\n<h2>3. \u0936\u093e\u092b\u094d\u091f \u0927\u0928\u0941\u0937\u094d\u092f \u0915\u093e\u0930\u0923\u0947<\/h2>\n<p>Understanding the root cause both prevents recurrence and points to the right correction. The drivers fall into three families.<\/p>\n<h3>3.1 Mechanical Causes<\/h3>\n<ul>\n<li><strong>\u0905\u0924\u093f-\u092d\u093e\u0930:<\/strong> operating at loads exceeding design limits.<\/li>\n<li><strong>Improper storage:<\/strong> storing shafts horizontally without proper support, allowing creep sag over time \u2014 especially on long, slender rotors left for months on two end supports.<\/li>\n<li><strong>\u091a\u0941\u0915\u0940\u091a\u0940 \u0939\u093e\u0924\u093e\u0933\u0923\u0940:<\/strong> lifting by the shaft instead of the designated lifting points.<\/li>\n<li><strong>Accident or impact:<\/strong> dropping, collision, or foreign-object damage.<\/li>\n<li><strong>Bearing seizure:<\/strong> a seized bearing can cause the shaft to bend under the driving torque.<\/li>\n<\/ul>\n<h3>3.2 Thermal Causes<\/h3>\n<ul>\n<li><strong>Uneven heating:<\/strong> non-uniform temperature distribution around the shaft circumference.<\/li>\n<li><strong>Rapid temperature changes:<\/strong> thermal shock during startup or shutdown.<\/li>\n<li><strong>\u0939\u0949\u091f \u0938\u094d\u092a\u0949\u091f\u094d\u0938:<\/strong> localised heating from friction, rubs, or process conditions.<\/li>\n<li><strong>Inadequate warm-up:<\/strong> starting cold turbines or large machines too quickly.<\/li>\n<li><strong>\u0936\u091f\u0921\u093e\u0909\u0928 \u092a\u094d\u0930\u0915\u094d\u0930\u093f\u092f\u093e:<\/strong> allowing a hot shaft to stop rotating before it cools (thermal sag).<\/li>\n<\/ul>\n<h3>3.3 Material and Manufacturing Causes<\/h3>\n<ul>\n<li><strong>Poor material quality:<\/strong> inclusions, voids, or material inhomogeneities.<\/li>\n<li><strong>\u0905\u092f\u094b\u0917\u094d\u092f \u0909\u0937\u094d\u092e\u093e \u0909\u092a\u091a\u093e\u0930:<\/strong> residual stresses from quenching or tempering.<\/li>\n<li><strong>Welding distortion:<\/strong> asymmetric welding creating residual stresses.<\/li>\n<li><strong>Machining stresses:<\/strong> stresses induced during manufacturing that relax in service.<\/li>\n<\/ul>\n<h2>4. \u0936\u093e\u092b\u094d\u091f \u092c\u094b\u092e\u0941\u0933\u0947 \u0915\u0902\u092a\u0928 \u0915\u0938\u0947 \u0939\u094b\u0924\u0947<\/h2>\n<p>A bowed shaft generates vibration through two distinct but cooperating mechanisms.<\/p>\n<h3>4.1 Geometric Unbalance<\/h3>\n<p>\u091c\u0947\u0935\u094d\u0939\u093e \u0935\u093e\u0915\u0932\u0947\u0932\u093e \u0936\u093e\u092b\u094d\u091f \u092b\u093f\u0930\u0924\u094b, \u0924\u0947\u0935\u094d\u0939\u093e \u0924\u094d\u092f\u093e\u091a\u0940 \u0935\u0915\u094d\u0930 \u0915\u0947\u0902\u0926\u094d\u0930\u0930\u0947\u0937\u093e \u0936\u0902\u0915\u0942 \u0915\u093f\u0902\u0935\u093e \u0907\u0924\u0930 \u0917\u094b\u0932\u093e\u0915\u093e\u0930 \u0928\u0938\u0932\u0947\u0932\u094d\u092f\u093e \u092e\u093e\u0930\u094d\u0917\u093e\u0932\u093e \u0938\u094d\u0935\u0940\u092a \u0915\u0930\u0924\u0947. <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/centrifugal-force\/\">\u0915\u0947\u0902\u0926\u094d\u0930\u093e\u092a\u0938\u093e\u0930\u0915 \u092c\u0932<\/a> that rises with the square of speed, producing strong 1\u00d7 vibration at <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/running-speed\/\">running speed<\/a>. This is precisely why bow masquerades as unbalance in the spectrum.<\/p>\n<h3>4.2 Moment Loading on the Bearings<\/h3>\n<p>The curvature also imposes a static and rotating bending moment that is fed straight into the bearings, causing fluctuating bearing loads and seat vibration. On larger rotors this moment loading is what drives accelerated bearing wear and, in extreme cases, contact between the rotor and stationary seals. A heavily bowed rotor whose bow sits near a <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/critical-speed\/\">critical speed<\/a> can produce an amplified, sometimes alarming, response on run-up.<\/p>\n<h2>5. Detecting Shaft Bow<\/h2>\n<p>Because bow and genuine mass unbalance share the same 1\u00d7 signature, distinguishing them is the crux of the diagnosis. The most powerful discriminator is behaviour at very low speed and during temperature change.<\/p>\n<h3>5.1 Symptom Comparison: Bow vs Unbalance<\/h3>\n<table border=\"1\" style=\"width:100%; border-collapse:collapse;\">\n<tr>\n<th>\u0935\u0948\u0936\u093f\u0937\u094d\u091f\u094d\u092f\u092a\u0942\u0930\u094d\u0923<\/th>\n<th>Unbalance<\/th>\n<th>\u0936\u093e\u092b\u094d\u091f \u092c\u094b<\/th>\n<\/tr>\n<tr>\n<td>\u0915\u0902\u092a\u0928 \u0935\u093e\u0930\u0902\u0935\u093e\u0930\u0924\u093e<\/td>\n<td>\u0967\u00d7 \u091a\u093e\u0932\u0942 \u0917\u0924\u0940<\/td>\n<td>\u0967\u00d7 \u091a\u093e\u0932\u0942 \u0917\u0924\u0940<\/td>\n<\/tr>\n<tr>\n<td>\u092b\u0947\u091c \u0938\u0902\u092c\u0902\u0927<\/td>\n<td>\u0938\u093e\u0924\u0924\u094d\u092f\u092a\u0942\u0930\u094d\u0923, \u0928\u0947\u0939\u092e\u0940 \u0938\u092e\u093e\u0928<\/td>\n<td>\u0935\u0949\u0930\u094d\u092e-\u0905\u092a\u0926\u0930\u092e\u094d\u092f\u093e\u0928 \u092c\u0926\u0932\u0942 \u0936\u0915\u0924\u0947<\/td>\n<\/tr>\n<tr>\n<td>\u0938\u094d\u0932\u094b \u0930\u094b\u0932 \u0915\u0902\u092a\u0928<\/td>\n<td>\u0909\u092a\u0938\u094d\u0925\u093f\u0924 (speed\u00b2 \u091a\u094d\u092f\u093e \u092a\u094d\u0930\u092e\u093e\u0923\u093e\u0924)<\/td>\n<td>\u0909\u092a\u0938\u094d\u0925\u093f\u0924 \u0906\u0923\u093f \u0905\u0917\u0926\u0940 \u0915\u092e\u0940 \u0935\u0947\u0917\u093e\u0924\u0939\u0940 \u0905\u0928\u0947\u0915\u0926\u093e \u0932\u0915\u094d\u0937\u0923\u0940\u092f<\/td>\n<\/tr>\n<tr>\n<td>\u0938\u0902\u0924\u0941\u0932\u0928\u093e\u0932\u093e \u092a\u094d\u0930\u0924\u093f\u0915\u094d\u0930\u093f\u092f\u093e<\/td>\n<td>\u092f\u094b\u0917\u094d\u092f balancing \u0915\u0947\u0932\u094d\u092f\u093e\u0938 \u0915\u0902\u092a\u0928 \u0915\u092e\u0940 \u0939\u094b\u0924\u0947<\/td>\n<td>\u0905\u0924\u094d\u092f\u0932\u094d\u092a \u0915\u093f\u0902\u0935\u093e \u0905\u091c\u093f\u092c\u093e\u0924 \u0938\u0941\u0927\u093e\u0930\u0923\u093e \u0928\u093e\u0939\u0940; \u0905\u0927\u093f\u0915 \u0935\u093e\u0908\u091f \u0939\u094b\u090a \u0936\u0915\u0924\u0947<\/td>\n<\/tr>\n<tr>\n<td>\u0909\u0937\u094d\u0923\u0924\u093e\u091c\u0928\u094d\u092f \u0938\u0902\u0935\u0947\u0926\u0928\u0936\u0940\u0932\u0924\u093e<\/td>\n<td>\u0924\u093e\u092a\u092e\u093e\u0928\u093e\u0938\u0939 \u0924\u0941\u0932\u0928\u0947\u0928\u0947 \u0938\u094d\u0925\u093f\u0930<\/td>\n<td>warm-up\/cool-down \u0926\u0930\u092e\u094d\u092f\u093e\u0928 \u0932\u0915\u094d\u0937\u0923\u0940\u092f \u092c\u0926\u0932\u0924\u0947<\/td>\n<\/tr>\n<tr>\n<td>\u0930\u0928-\u0906\u0909\u091f \u092e\u093e\u092a\u0928<\/td>\n<td>\u0930\u094b\u091f\u0930 \u0938\u094d\u0925\u093f\u0930 \u0905\u0938\u0924\u093e\u0928\u093e \u0915\u092e\u0940<\/td>\n<td>\u0938\u094d\u0925\u093f\u0930 \u0905\u0938\u0924\u093e\u0928\u093e\u0939\u0940 \u091c\u093e\u0938\u094d\u0924 \u0930\u0928-\u0906\u0909\u091f (\u0915\u093e\u092f\u092e\u0938\u094d\u0935\u0930\u0942\u092a\u0940 \u092c\u094b)<\/td>\n<\/tr>\n<\/table>\n<p>The single most telling row is the slow-roll line. Unbalance force collapses toward zero as speed drops because it scales with the square of rotational speed; a permanent bow, being a fixed geometric offset, still shows substantial run-out and 1\u00d7 motion at a crawl. That is the test that breaks the tie.<\/p>\n<h3>5.2 Diagnostic Tests<\/h3>\n<h4>5.2.1 Slow Roll Measurement<\/h4>\n<p>Rotate the shaft very slowly \u2014 typically 5\u201310% of operating speed \u2014 and measure <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/run-out\/\">\u0930\u0928-\u0906\u0909\u091f<\/a> a \u0938\u0939 <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/proximity-probe\/\">\u0938\u092e\u0940\u092a\u0924\u093e \u091c\u093e\u091a<\/a> or a dial indicator. High run-out at slow roll indicates shaft bow or mechanical run-out rather than unbalance, whose centrifugal force is negligible at such low speed. The slow-roll vector is also recorded so it can be subtracted from the running vibration data, isolating the true dynamic response from the static bow component.<\/p>\n<h4>5.2.2 \u0936\u091f-\u0921\u093e\u0909\u0928 \u092b\u0947\u091c \u0936\u093f\u092b\u094d\u091f<\/h4>\n<p>Monitor the vibration <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/phase-angle\/\">\u092b\u0947\u091c \u0915\u094b\u0928<\/a> as the machine coasts down. True unbalance holds a constant <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/phase\/\">phase<\/a> regardless of speed (away from resonance). A thermally bowed shaft tends to show phase that drifts as the rotor cools, and plotting amplitude and phase together on a <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/bode-plot\/\">\u092c\u094b\u0921 \u092a\u094d\u0932\u0949\u091f<\/a> or <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/polar-plot\/\">\u0927\u094d\u0930\u0941\u0935\u0940\u092f \u0906\u0932\u0947\u0916<\/a> makes the difference far easier to read than raw numbers.<\/p>\n<h4>5.2.3 Thermal Bow Test<\/h4>\n<p>For a suspected thermal bow, monitor vibration through startup and warm-up. Thermal bow typically shows vibration <em>increasing<\/em> as the machine heats up, then stabilising or falling once thermal equilibrium is reached \u2014 the mirror image of a fault that grows purely with speed.<\/p>\n<h4>5.2.4 Off-Machine Run-Out Check<\/h4>\n<p>\u0930\u094b\u091f\u0930 \u0915\u093e\u0922\u093e, \u0924\u094d\u092f\u093e\u0932\u093e \u0935\u094d\u0939\u0940-\u092c\u094d\u0932\u0949\u0915\u094d\u0938\u0935\u0930 \u0915\u093f\u0902\u0935\u093e \u0932\u0947\u0925 \u0938\u0947\u0902\u091f\u0930\u094d\u0938\u092e\u0927\u094d\u092f\u0947 \u0906\u0927\u093e\u0930 \u0926\u094d\u092f\u093e \u0906\u0923\u093f \u0921\u093e\u092f\u0932 \u0907\u0902\u0921\u093f\u0915\u0947\u091f\u0930\u0938\u0939 \u0930\u0947\u0921\u093f\u092f\u0932 \u0930\u0928-\u0906\u0909\u091f \u092e\u094b\u091c\u0924\u093e\u0928\u093e \u0939\u0933\u0942 \u0939\u0933\u0942 \u092b\u093f\u0930\u0935\u093e.<\/p>\n<h4>5.2.5 \u0935\u094d\u0939\u093f\u091c\u094d\u092f\u0941\u0905\u0932 \u0924\u092a\u093e\u0938\u0923\u0940<\/h4>\n<p>On large shafts, sighting down the length of the shaft or using optical methods such as <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/laser-shaft-alignment\/\">laser alignment<\/a> equipment can reveal an obvious bow that the eye alone might miss.<\/p>\n<h2>6. \u0926\u0941\u0930\u0941\u0938\u094d\u0924\u0940\u091a\u094d\u092f\u093e \u092a\u0926\u094d\u0927\u0924\u0940<\/h2>\n<p>\u092f\u094b\u0917\u094d\u092f \u0926\u0941\u0930\u0941\u0938\u094d\u0924\u0940 bow\u091a\u094d\u092f\u093e \u0924\u0940\u0935\u094d\u0930\u0924\u0947\u0935\u0930 \u0906\u0923\u093f \u092a\u094d\u0930\u0915\u093e\u0930\u093e\u0935\u0930 \u0905\u0935\u0932\u0902\u092c\u0942\u0928 \u0905\u0938\u0924\u0947. \u092a\u094d\u0930\u0924\u094d\u092f\u0947\u0915 \u092a\u0930\u093f\u0938\u094d\u0925\u093f\u0924\u0940\u0938\u093e\u0920\u0940 \u090f\u0915\u091a \u0909\u092a\u093e\u092f \u092f\u094b\u0917\u094d\u092f \u0920\u0930\u0924 \u0928\u093e\u0939\u0940.<\/p>\n<h3>6.1 For Permanent Mechanical Bow<\/h3>\n<h4>6.1.1 Shaft Straightening<\/h4>\n<p>\u0938\u094c\u092e\u094d\u092f \u0924\u0947 \u092e\u0927\u094d\u092f\u092e \u0927\u0928\u0941\u0937\u094d\u092f\u093e\u0938\u093e\u0920\u0940 \u2014 \u0935\u093f\u0936\u0947\u0937\u0924: 0.005 \u0907\u0902\u091a (125 \u00b5m) \u091a\u094d\u092f\u093e \u0916\u093e\u0932\u0940 \u2014 \u0936\u093e\u092b\u094d\u091f \u0915\u0927\u0940\u0915\u0927\u0940 \u0939\u093e\u092f\u0921\u094d\u0930\u0949\u0932\u093f\u0915 \u0926\u093e\u092c\u093e\u0928\u0947 \u0925\u0902\u0921- \u0915\u093f\u0902\u0935\u093e \u0917\u0930\u092e-\u0938\u0930\u0933 \u0939\u094b\u090a \u0936\u0915\u0924\u094b.<\/p>\n<h4>6.1.2 Thermal Stress Relief<\/h4>\n<p>Heat-treating the shaft to relieve residual stresses can reduce or eliminate bow that originated from locked-in manufacturing or welding stress. This needs proper furnace equipment and tight process control to avoid introducing fresh distortion.<\/p>\n<h4>6.1.3 Shaft Replacement<\/h4>\n<p>For severe bow, or in critical service, replacement is often the most reliable answer. The cost of a new shaft has to be weighed against downtime and the real risk that a straightening attempt fails or relaxes back over time.<\/p>\n<h4>6.1.4 &#8220;Bow\u091a\u094d\u092f\u093e \u0906\u0938\u092a\u093e\u0938 balancing&#8221;<\/h4>\n<p>In some cases \u2014 large turbines in particular \u2014 <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/correction-weight\/\">\u0938\u0941\u0927\u093e\u0930\u0923\u093e \u0935\u091c\u0928<\/a> \u0917\u0923\u0928\u093e \u0915\u0947\u0932\u0940 \u091c\u093e\u090a \u0936\u0915\u0924\u0947 \u0906\u0923\u093f \u092a\u094d\u0930\u0924\u093f\u0915\u093e\u0930 \u0915\u0930\u0923\u094d\u092f\u093e\u0938\u093e\u0920\u0940 \u092b\u093f\u091f \u0915\u0947\u0932\u0947 \u091c\u093e\u090a \u0936\u0915\u0924\u0947 <em>\u092a\u0930\u093f\u0923\u093e\u092e<\/em> of the bow at running speed. This does not straighten the shaft; it merely cancels the 1\u00d7 force the bow produces. It is a limited, generally temporary measure, and it leaves a rotor whose <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/residual-unbalance\/\">\u0905\u0935\u0936\u093f\u0937\u094d\u091f \u0905\u0938\u0902\u0924\u0941\u0932\u0928<\/a> only looks acceptable at one specific speed and temperature.<\/p>\n<h3>6.2 For Thermal Bow<\/h3>\n<h4>6.2.1 Operating Procedure Changes<\/h4>\n<ul>\n<li>Implement slow, staged warm-up procedures.<\/li>\n<li>Maintain continuous turning-gear operation during shutdown to prevent thermal sag.<\/li>\n<li>Control steam admission or process-fluid temperatures more carefully.<\/li>\n<li>Ensure symmetric heating and cooling.<\/li>\n<\/ul>\n<h4>6.2.2 Design Modifications<\/h4>\n<ul>\n<li>Add insulation to reduce thermal gradients.<\/li>\n<li>Install heating jackets for uniform warm-up.<\/li>\n<li>Improve the cooling system to even out the temperature distribution.<\/li>\n<\/ul>\n<h4>6.2.3 Turning Gear Operation<\/h4>\n<p>For large turbines, running the turning gear (a slow-speed rotational drive) during warm-up and cool-down keeps the shaft turning so that heat is distributed evenly around the circumference, preventing the gradient that would otherwise bow the rotor.<\/p>\n<h2>7. Verifying the Rotor in the Field<\/h2>\n<p>Once a shaft has been straightened, replaced, or judged straight enough to run, the rotor still has to be checked dynamically in its own bearings \u2014 bench run-out alone does not prove it will run smoothly at speed. A portable two-channel analyser such as the <a href=\"https:\/\/vibromera.eu\/mr\/product\/balanset-1\/\">Balanset-1A<\/a> makes this practical on site: it captures the slow-roll vector, then measures 1\u00d7 <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/phase\/\">\u092e\u094b\u0920\u0947\u092a\u0923\u093e \u0906\u0923\u093f \u091f\u092a\u094d\u092a\u093e<\/a> through the speed range so an engineer can separate any remaining bow component from genuine mass unbalance. Only once the slow-roll run-out confirms the shaft is acceptably straight does it make sense to proceed to a trim <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/balancing\/\">\u0938\u0902\u0924\u0941\u0932\u0928<\/a> \u2014 at which point the same instrument computes the <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/influence-coefficient\/\">\u0907\u0928\u094d\u092b\u094d\u0932\u0941\u0905\u0928\u094d\u0938 \u0915\u094b\u0907\u092b\u093f\u0936\u0902\u091f\u094d\u0938<\/a> and verifies the final result against an <a href=\"https:\/\/vibromera.eu\/mr\/glossary\/iso-21940-11\/\">ISO 21940-11<\/a> balance grade. You can pre-calculate that permissible residual figure with the <a href=\"https:\/\/vibromera.eu\/mr\/calculators\/residual-unbalance-iso1940\/\">\u0905\u0935\u0936\u093f\u0937\u094d\u091f \u0905\u0938\u0902\u0924\u0941\u0932\u0928 \u0915\u0945\u0932\u094d\u0915\u094d\u092f\u0941\u0932\u0947\u091f\u0930 (ISO 21940-11)<\/a> \u0938\u0941\u0930\u0942 \u0915\u0930\u0923\u094d\u092f\u093e\u092a\u0942\u0930\u094d\u0935\u0940.<\/p>\n<h2>8. Prevention Strategies<\/h2>\n<p>Preventing shaft bow is far cheaper and faster than correcting it.<\/p>\n<h3>8.1 Design and Manufacturing<\/h3>\n<ul>\n<li>Use proper heat-treatment procedures to minimise residual stresses.<\/li>\n<li>Design adequate shaft stiffness for the application.<\/li>\n<li>Specify materials suited to the thermal environment.<\/li>\n<\/ul>\n<h3>8.2 Installation and Maintenance<\/h3>\n<ul>\n<li>Always lift rotors using designated lifting points, never by the shaft.<\/li>\n<li>Store spare rotors with proper support to prevent sag \u2014 ideally rotated periodically or supported near the journals.<\/li>\n<li>Avoid mechanical shock during handling.<\/li>\n<li>shaft\u091a\u0940 \u0938\u0930\u0933\u0924\u093e \u0928\u093f\u092f\u092e\u093f\u0924\u092a\u0923\u0947 \u0924\u092a\u093e\u0938\u093e, \u0935\u0930\u094d\u0937\u093e\u0924\u0942\u0928 \u090f\u0915\u0926\u093e \u0915\u093f\u0902\u0935\u093e \u0928\u093f\u0930\u094d\u092e\u093e\u0924\u093e \u0926\u093f\u0932\u0947\u0932\u094d\u092f\u093e schedule\u0928\u0941\u0938\u093e\u0930.<\/li>\n<\/ul>\n<h3>8.3 \u0915\u093e\u0930\u094d\u092f\u0930\u0924 \u0938\u094d\u0925\u093f\u0924\u0940<\/h3>\n<ul>\n<li>\u0928\u093f\u0930\u094d\u092e\u093e\u0924\u094d\u092f\u093e\u091a\u094d\u092f\u093e warm-up \u0906\u0923\u093f shutdown procedures\u091a\u0947 \u092a\u093e\u0932\u0928 \u0915\u0930\u093e.<\/li>\n<li>Avoid rapid temperature changes.<\/li>\n<li>Monitor for signs of thermal bow during startups.<\/li>\n<li>Investigate any unexplained change in vibration phase promptly.<\/li>\n<\/ul>\n<h2>9. Impact on Balancing Procedures<\/h2>\n<p>Attempting to balance a bowed shaft is generally futile and can be actively counterproductive:<\/p>\n<ul>\n<li><strong>\u0905\u092a\u094d\u0930\u092d\u093e\u0935\u0940 \u0938\u0941\u0927\u093e\u0930\u0923\u093e:<\/strong> weights calculated for mass unbalance cannot correct a geometric bow.<\/li>\n<li><strong>Masking the problem:<\/strong> \u0935\u093e\u0915\u0932\u0947\u0932\u094d\u092f\u093e shaft\u091a\u0947 \u0905\u0902\u0936\u0924\u0903 &#8220;\u092f\u0936\u0938\u094d\u0935\u0940&#8221; balancing \u0915\u093e\u0939\u0940 \u0915\u093e\u0933\u093e\u0938\u093e\u0920\u0940 vibration \u0915\u092e\u0940 \u0915\u0930\u0942 \u0936\u0915\u0924\u0947, \u092a\u0923 \u0916\u0930\u093e \u0926\u094b\u0937 \u2014 \u0906\u0923\u093f \u0924\u094d\u092f\u093e\u0924\u0942\u0928 \u092f\u0947\u0923\u093e\u0930\u0947 bearing loading \u2014 \u0924\u0938\u093e\u091a \u0930\u093e\u0939\u0924\u094b.<\/li>\n<li><strong>Wasted time:<\/strong> repeated balancing runs that refuse to converge are themselves a red flag for bow.<\/li>\n<li><strong>Potential damage:<\/strong> piling large correction weights onto a bowed shaft raises stresses and can drive further damage or even fatigue cracking.<\/li>\n<\/ul>\n<p><strong>\u0938\u0930\u094d\u0935\u094b\u0924\u094d\u0924\u092e \u092a\u0926\u094d\u0927\u0924:<\/strong> always check for shaft bow before you begin balancing, especially if the rotor has any history of rough handling, thermal events, or vibration that no one has been able to explain. A two-minute slow-roll check can save a wasted afternoon and a damaged shaft.<\/p>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/mr\/glossary\/\">\u2190 \u092e\u0941\u0916\u094d\u092f \u0928\u093f\u0930\u094d\u0926\u0947\u0936\u0915\u093e\u0902\u0915\u0921\u0947 \u092a\u0930\u0924<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Learn about shaft bow, a permanent or temporary curvature in a rotor shaft that causes vibration symptoms similar to unbalance but requires different diagnostic and correction approaches.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[109,110],"tags":[],"class_list":["post-232","glossary","type-glossary","status-publish","hentry","category-glossary","category-vibration-diagnostics"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/glossary\/232","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/glossary\/232\/revisions"}],"predecessor-version":[{"id":101458,"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/glossary\/232\/revisions\/101458"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/media?parent=232"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/categories?post=232"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/mr\/wp-json\/wp\/v2\/tags?post=232"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}