{"id":234,"date":"2025-10-31T00:25:51","date_gmt":"2025-10-31T00:25:51","guid":{"rendered":"https:\/\/vibromera.eu\/glossary\/shaft-crack\/"},"modified":"2026-05-23T22:53:50","modified_gmt":"2026-05-23T22:53:50","slug":"shaft-crack","status":"publish","type":"glossary","link":"https:\/\/vibromera.eu\/gu\/glossary\/shaft-crack\/","title":{"rendered":"What is a Shaft Crack? Detection and Diagnosis"},"content":{"rendered":"<h1>Understanding Shaft Cracks in Rotating Machinery<\/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\/gu\/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\/gu\/product\/balanset-1\/\" title=\"\u0aaa\u0acb\u0ab0\u0acd\u0a9f\u0ac7\u0aac\u0ab2 \u0aac\u0ac7\u0ab2\u0ac7\u0aa8\u0acd\u0ab8\u0ab0 \u0a85\u0aa8\u0ac7 \u0a95\u0a82\u0aaa\u0aa8 \u0ab5\u0abf\u0ab6\u0acd\u0ab2\u0ac7\u0ab7\u0a95 \u0aac\u0ac7\u0ab2\u0ac7\u0aa8\u0acd\u0ab8\u0ac7\u0a9f-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 full kit portable balancer and vibration analyzer\" 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\/gu\/product-category\/devices\/\" rel=\"tag\">\u0a89\u0aaa\u0a95\u0ab0\u0aa3\u0acb<\/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\/gu\/product\/balanset-1\/\" title=\"\u0aaa\u0acb\u0ab0\u0acd\u0a9f\u0ac7\u0aac\u0ab2 \u0aac\u0ac7\u0ab2\u0ac7\u0aa8\u0acd\u0ab8\u0ab0 \u0a85\u0aa8\u0ac7 \u0a95\u0a82\u0aaa\u0aa8 \u0ab5\u0abf\u0ab6\u0acd\u0ab2\u0ac7\u0ab7\u0a95 \u0aac\u0ac7\u0ab2\u0ac7\u0aa8\u0acd\u0ab8\u0ac7\u0a9f-1A\">\u0aaa\u0acb\u0ab0\u0acd\u0a9f\u0ac7\u0aac\u0ab2 \u0aac\u0ac7\u0ab2\u0ac7\u0aa8\u0acd\u0ab8\u0ab0 \u0a85\u0aa8\u0ac7 \u0a95\u0a82\u0aaa\u0aa8 \u0ab5\u0abf\u0ab6\u0acd\u0ab2\u0ac7\u0ab7\u0a95 \u0aac\u0ac7\u0ab2\u0ac7\u0aa8\u0acd\u0ab8\u0ac7\u0a9f-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\">\u20ac<\/span>1,975.00<\/span> + VAT (if applicable)<\/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=\"\/gu\/wp-json\/wp\/v2\/glossary\/234?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=\"\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0ab8\u0abe\u0aae\u0ac7\u0ab2 \u0a95\u0ab0\u0acb\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0ab8\u0abe\u0aae\u0ac7\u0ab2 \u0a95\u0ab0\u0acb\" 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=\"\/gu\/wp-json\/wp\/v2\/glossary\/234?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=\"\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0a89\u0aae\u0ac7\u0ab0\u0acb: \u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d\" rel=\"nofollow\" data-success_message=\"\u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d \u0aa4\u0aae\u0abe\u0ab0\u0abe \u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0a89\u0aae\u0ac7\u0ab0\u0ab5\u0abe\u0aae\u0abe\u0a82 \u0a86\u0ab5\u0acd\u0aaf\u0ac1\u0a82 \u0a9b\u0ac7\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0ab8\u0abe\u0aae\u0ac7\u0ab2 \u0a95\u0ab0\u0acb<\/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\/gu\/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\/gu\/product\/vibration-sensor\/\" title=\"\u0ab5\u0abe\u0a87\u0aac\u0acd\u0ab0\u0ac7\u0ab6\u0aa8 \u0ab8\u0ac7\u0aa8\u0acd\u0ab8\u0ab0\">\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 vibration sensor close-up\" 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\/gu\/product-category\/parts\/\" rel=\"tag\">\u0aad\u0abe\u0a97\u0acb<\/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\/gu\/product\/vibration-sensor\/\" title=\"\u0ab5\u0abe\u0a87\u0aac\u0acd\u0ab0\u0ac7\u0ab6\u0aa8 \u0ab8\u0ac7\u0aa8\u0acd\u0ab8\u0ab0\">\u0ab5\u0abe\u0a87\u0aac\u0acd\u0ab0\u0ac7\u0ab6\u0aa8 \u0ab8\u0ac7\u0aa8\u0acd\u0ab8\u0ab0<\/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\">\u20ac<\/span>90.00<\/span> + VAT (if applicable)<\/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=\"\/gu\/wp-json\/wp\/v2\/glossary\/234?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=\"\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0ab8\u0abe\u0aae\u0ac7\u0ab2 \u0a95\u0ab0\u0acb\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0ab8\u0abe\u0aae\u0ac7\u0ab2 \u0a95\u0ab0\u0acb\" 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=\"\/gu\/wp-json\/wp\/v2\/glossary\/234?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=\"\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0a89\u0aae\u0ac7\u0ab0\u0acb: \u201cVibration sensor\u201d\" rel=\"nofollow\" data-success_message=\"\u201cVibration sensor\u201d \u0aa4\u0aae\u0abe\u0ab0\u0abe \u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0a89\u0aae\u0ac7\u0ab0\u0ab5\u0abe\u0aae\u0abe\u0a82 \u0a86\u0ab5\u0acd\u0aaf\u0ac1\u0a82 \u0a9b\u0ac7\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0ab8\u0abe\u0aae\u0ac7\u0ab2 \u0a95\u0ab0\u0acb<\/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\/gu\/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\/gu\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"\u0a93\u0aaa\u0acd\u0a9f\u0abf\u0a95\u0ab2 \u0ab8\u0ac7\u0aa8\u0acd\u0ab8\u0ab0 (\u0ab2\u0ac7\u0ab8\u0ab0 \u0a9f\u0ac7\u0a95\u0acb\u0aae\u0ac0\u0a9f\u0ab0)\">\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=\"\u0a93\u0aaa\u0acd\u0a9f\u0abf\u0a95\u0ab2 \u0ab8\u0ac7\u0aa8\u0acd\u0ab8\u0ab0 (\u0ab2\u0ac7\u0ab8\u0ab0 \u0a9f\u0ac7\u0a95\u0acb\u0aae\u0ac0\u0a9f\u0ab0)\" 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\/gu\/product-category\/parts\/\" rel=\"tag\">\u0aad\u0abe\u0a97\u0acb<\/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\/gu\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"\u0a93\u0aaa\u0acd\u0a9f\u0abf\u0a95\u0ab2 \u0ab8\u0ac7\u0aa8\u0acd\u0ab8\u0ab0 (\u0ab2\u0ac7\u0ab8\u0ab0 \u0a9f\u0ac7\u0a95\u0acb\u0aae\u0ac0\u0a9f\u0ab0)\">\u0a93\u0aaa\u0acd\u0a9f\u0abf\u0a95\u0ab2 \u0ab8\u0ac7\u0aa8\u0acd\u0ab8\u0ab0 (\u0ab2\u0ac7\u0ab8\u0ab0 \u0a9f\u0ac7\u0a95\u0acb\u0aae\u0ac0\u0a9f\u0ab0)<\/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\">\u20ac<\/span>124.00<\/span> + VAT (if applicable)<\/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=\"\/gu\/wp-json\/wp\/v2\/glossary\/234?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=\"\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0ab8\u0abe\u0aae\u0ac7\u0ab2 \u0a95\u0ab0\u0acb\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0ab8\u0abe\u0aae\u0ac7\u0ab2 \u0a95\u0ab0\u0acb\" 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=\"\/gu\/wp-json\/wp\/v2\/glossary\/234?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=\"\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0a89\u0aae\u0ac7\u0ab0\u0acb: \u201cOptical Sensor (Laser Tachometer)\u201d\" rel=\"nofollow\" data-success_message=\"\u201cOptical Sensor (Laser Tachometer)\u201d \u0aa4\u0aae\u0abe\u0ab0\u0abe \u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0a89\u0aae\u0ac7\u0ab0\u0ab5\u0abe\u0aae\u0abe\u0a82 \u0a86\u0ab5\u0acd\u0aaf\u0ac1\u0a82 \u0a9b\u0ac7\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0ab8\u0abe\u0aae\u0ac7\u0ab2 \u0a95\u0ab0\u0acb<\/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\/gu\/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\/gu\/product\/balanset-4\/\" title=\"\u0aac\u0abe\u0ab2\u0aa8\u0acd\u0ab8\u0ac7\u0a9f-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 rotor balancing kit: carry case, multi-channel signal conditioner, handheld analyzer, magnetic base, vibration sensors, and coiled cables.\" 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\/gu\/product-category\/devices\/\" rel=\"tag\">\u0a89\u0aaa\u0a95\u0ab0\u0aa3\u0acb<\/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\/gu\/product\/balanset-4\/\" title=\"\u0aac\u0abe\u0ab2\u0aa8\u0acd\u0ab8\u0ac7\u0a9f-4\">\u0aac\u0abe\u0ab2\u0aa8\u0acd\u0ab8\u0ac7\u0a9f-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\">\u20ac<\/span>6,803.00<\/span> + VAT (if applicable)<\/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=\"\/gu\/wp-json\/wp\/v2\/glossary\/234?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=\"\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0ab8\u0abe\u0aae\u0ac7\u0ab2 \u0a95\u0ab0\u0acb\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0ab8\u0abe\u0aae\u0ac7\u0ab2 \u0a95\u0ab0\u0acb\" 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=\"\/gu\/wp-json\/wp\/v2\/glossary\/234?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=\"\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0a89\u0aae\u0ac7\u0ab0\u0acb: \u201cBalanset-4\u201d\" rel=\"nofollow\" data-success_message=\"\u201cBalanset-4\u201d \u0aa4\u0aae\u0abe\u0ab0\u0abe \u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0a89\u0aae\u0ac7\u0ab0\u0ab5\u0abe\u0aae\u0abe\u0a82 \u0a86\u0ab5\u0acd\u0aaf\u0ac1\u0a82 \u0a9b\u0ac7\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0ab8\u0abe\u0aae\u0ac7\u0ab2 \u0a95\u0ab0\u0acb<\/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\/gu\/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\/gu\/product\/magnet-stand\/\" title=\"\u0aae\u0ac7\u0a97\u0acd\u0aa8\u0ac7\u0a9f\u0abf\u0a95 \u0ab8\u0acd\u0a9f\u0ac7\u0aa8\u0acd\u0aa1 \u0a87\u0aa8\u0acd\u0ab8\u0abe\u0a87\u0a9d-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=\"\u0a9a\u0ac1\u0a82\u0aac\u0a95 \u0a86\u0aa7\u0abe\u0ab0.\" 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\/gu\/product-category\/parts\/\" rel=\"tag\">\u0aad\u0abe\u0a97\u0acb<\/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\/gu\/product\/magnet-stand\/\" title=\"\u0aae\u0ac7\u0a97\u0acd\u0aa8\u0ac7\u0a9f\u0abf\u0a95 \u0ab8\u0acd\u0a9f\u0ac7\u0aa8\u0acd\u0aa1 \u0a87\u0aa8\u0acd\u0ab8\u0abe\u0a87\u0a9d-60-kgf\">\u0aae\u0ac7\u0a97\u0acd\u0aa8\u0ac7\u0a9f\u0abf\u0a95 \u0ab8\u0acd\u0a9f\u0ac7\u0aa8\u0acd\u0aa1 \u0a87\u0aa8\u0acd\u0ab8\u0abe\u0a87\u0a9d-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\">\u20ac<\/span>46.00<\/span> + VAT (if applicable)<\/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=\"\/gu\/wp-json\/wp\/v2\/glossary\/234?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=\"\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0ab8\u0abe\u0aae\u0ac7\u0ab2 \u0a95\u0ab0\u0acb\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0ab8\u0abe\u0aae\u0ac7\u0ab2 \u0a95\u0ab0\u0acb\" 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=\"\/gu\/wp-json\/wp\/v2\/glossary\/234?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=\"\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0a89\u0aae\u0ac7\u0ab0\u0acb: \u201cMagnetic Stand Insize-60-kgf\u201d\" rel=\"nofollow\" data-success_message=\"\u201cMagnetic Stand Insize-60-kgf\u201d \u0aa4\u0aae\u0abe\u0ab0\u0abe \u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0a89\u0aae\u0ac7\u0ab0\u0ab5\u0abe\u0aae\u0abe\u0a82 \u0a86\u0ab5\u0acd\u0aaf\u0ac1\u0a82 \u0a9b\u0ac7\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0ab8\u0abe\u0aae\u0ac7\u0ab2 \u0a95\u0ab0\u0acb<\/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\/gu\/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\/gu\/product\/reflective-tape\/\" title=\"\u0aaa\u0acd\u0ab0\u0aa4\u0abf\u0aac\u0abf\u0a82\u0aac\u0ac0\u0aa4 \u0a9f\u0ac7\u0aaa\">\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=\"\u0aaa\u0acd\u0ab0\u0aa4\u0abf\u0aac\u0abf\u0a82\u0aac\u0ac0\u0aa4 \u0a9f\u0ac7\u0aaa\" 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\/gu\/product-category\/parts\/\" rel=\"tag\">\u0aad\u0abe\u0a97\u0acb<\/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\/gu\/product\/reflective-tape\/\" title=\"\u0aaa\u0acd\u0ab0\u0aa4\u0abf\u0aac\u0abf\u0a82\u0aac\u0ac0\u0aa4 \u0a9f\u0ac7\u0aaa\">\u0aaa\u0acd\u0ab0\u0aa4\u0abf\u0aac\u0abf\u0a82\u0aac\u0ac0\u0aa4 \u0a9f\u0ac7\u0aaa<\/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\">\u20ac<\/span>10.00<\/span> + VAT (if applicable)<\/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=\"\/gu\/wp-json\/wp\/v2\/glossary\/234?add-to-cart=2329\" data-quantity=\"1\" data-product_id=\"2329\" data-product_sku=\"rt-1\" class=\"button 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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\/gu\/product-category\/devices\/\" rel=\"tag\">\u0a89\u0aaa\u0a95\u0ab0\u0aa3\u0acb<\/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\/gu\/product\/dynamic-balancer-balanset-1a\/\" title=\"\u0aa1\u0abe\u0aaf\u0aa8\u0ac7\u0aae\u0abf\u0a95 \u0aac\u0ac7\u0ab2\u0ac7\u0aa8\u0acd\u0ab8\u0ab0 \u201c\u0aac\u0ac7\u0ab2\u0abe\u0aa8\u0acd\u0ab8\u0ac7\u0a9f-1\u0a8f\u201d OEM\">\u0aa1\u0abe\u0aaf\u0aa8\u0ac7\u0aae\u0abf\u0a95 \u0aac\u0ac7\u0ab2\u0ac7\u0aa8\u0acd\u0ab8\u0ab0 \u201c\u0aac\u0ac7\u0ab2\u0abe\u0aa8\u0acd\u0ab8\u0ac7\u0a9f-1\u0a8f\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 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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=\"\/gu\/wp-json\/wp\/v2\/glossary\/234?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=\"\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0a89\u0aae\u0ac7\u0ab0\u0acb: \u201cDynamic balancer \u201cBalanset-1A\u201d OEM\u201d\" rel=\"nofollow\" data-success_message=\"\u201cDynamic balancer \u201cBalanset-1A\u201d OEM\u201d \u0aa4\u0aae\u0abe\u0ab0\u0abe \u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0a89\u0aae\u0ac7\u0ab0\u0ab5\u0abe\u0aae\u0abe\u0a82 \u0a86\u0ab5\u0acd\u0aaf\u0ac1\u0a82 \u0a9b\u0ac7\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">\u0a95\u0abe\u0ab0\u0acd\u0a9f\u0aae\u0abe\u0a82 \u0ab8\u0abe\u0aae\u0ac7\u0ab2 \u0a95\u0ab0\u0acb<\/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>\u0a8f <strong>shaft crack<\/strong> is a fracture or discontinuity in a rotating shaft that grows out of fatigue, stress concentration, or a material flaw. Cracks almost always begin at the surface and propagate inward, advancing perpendicular to the direction of maximum tensile stress. In rotating machinery they are among the most dangerous defects of all, because a crack can travel from an undetectable hairline to complete shaft fracture in a matter of hours or days, with the potential for catastrophic, life-threatening failure. The saving grace is that a developing crack betrays itself in the <a href=\"https:\/\/vibromera.eu\/gu\/glossary\/vibration\/\">vibration<\/a> signal \u2014 most characteristically through a rising 2\u00d7 (twice-per-revolution) component \u2014 so disciplined <a href=\"https:\/\/vibromera.eu\/gu\/glossary\/vibration-analysis\/\">vibration analysis<\/a> offers a genuine chance to catch it before it lets go.<\/p>\n<h2>1. Definition: What is a Shaft Crack?<\/h2>\n<p>Mechanically, a crack is a region where the shaft has lost its continuity and therefore its stiffness. As the shaft rotates, the crack alternately opens and closes under the swinging bending stress, and this &#8220;breathing&#8221; makes the shaft&#8217;s stiffness vary with angular position. That asymmetry is the root of the diagnostic signatures discussed below, and it is what separates a true transverse crack from a permanent <a href=\"https:\/\/vibromera.eu\/gu\/glossary\/shaft-bow\/\">shaft bow<\/a> or a simple <a href=\"https:\/\/vibromera.eu\/gu\/glossary\/unbalance\/\">unbalance<\/a>. The broader phenomenon, when the crack has progressed enough to alter the whole rotor&#8217;s behaviour, is sometimes treated under the heading of a <a href=\"https:\/\/vibromera.eu\/gu\/glossary\/cracked-rotor\/\">cracked rotor<\/a>.<\/p>\n<h2>2. Common Causes of Shaft Cracks<\/h2>\n<h3>Fatigue from cyclic stresses<\/h3>\n<p>The dominant cause in rotating machinery, fatigue accumulates damage one stress cycle at a time:<\/p>\n<ul>\n<li><strong>Bending fatigue:<\/strong> a rotating shaft with uneven stiffness or off-centre loads experiences fully reversed cyclic bending stress.<\/li>\n<li><strong>Torsional fatigue:<\/strong> oscillating torque in power-transmission shafts drives <a href=\"https:\/\/vibromera.eu\/gu\/glossary\/torsional-vibration\/\">torsional vibration<\/a> and fatigue.<\/li>\n<li><strong>High-cycle fatigue:<\/strong> millions of cycles accumulate over years, so even modest stresses can eventually initiate a crack.<\/li>\n<li><strong>Stress concentration:<\/strong> keyways, cross-holes, fillets, and other geometric discontinuities locally magnify stress and are the usual initiation sites.<\/li>\n<\/ul>\n<h3>Operating conditions<\/h3>\n<ul>\n<li><strong>Excessive unbalance:<\/strong> high centrifugal force adds cyclic bending stress.<\/li>\n<li><strong>Misalignment:<\/strong> the bending moments from <a href=\"https:\/\/vibromera.eu\/gu\/glossary\/misalignment\/\">misalignment<\/a> accelerate fatigue.<\/li>\n<li><strong>Resonance operation:<\/strong> running at or near a <a href=\"https:\/\/vibromera.eu\/gu\/glossary\/critical-speed\/\">critical speed<\/a> produces large deflections and stresses.<\/li>\n<li><strong>Overload:<\/strong> operating beyond design limits.<\/li>\n<li><strong>Thermal stress:<\/strong> rapid heating or cooling and steep thermal gradients, which can also produce a transient <a href=\"https:\/\/vibromera.eu\/gu\/glossary\/thermal-bow\/\">thermal bow<\/a>.<\/li>\n<\/ul>\n<h3>Material and manufacturing defects<\/h3>\n<ul>\n<li><strong>Material inclusions:<\/strong> slag, voids, or foreign matter in the shaft material.<\/li>\n<li><strong>Improper heat treatment:<\/strong> inadequate hardening or tempering.<\/li>\n<li><strong>Machining defects:<\/strong> tool marks, gouges, or scratches acting as stress risers.<\/li>\n<li><strong>Corrosion pitting:<\/strong> surface pits that serve as crack-initiation sites.<\/li>\n<li><strong>Fretting:<\/strong> at press-fit interfaces or keyways, where micro-motion damages the surface.<\/li>\n<\/ul>\n<h3>Operational events<\/h3>\n<ul>\n<li><strong>Overspeed events:<\/strong> emergency or accidental overspeed imposing high stresses.<\/li>\n<li><strong>Severe rubs:<\/strong> <a href=\"https:\/\/vibromera.eu\/gu\/glossary\/rotor-rub\/\">rotor rub<\/a> contact generating heat and local stress concentration.<\/li>\n<li><strong>Impact loading:<\/strong> sudden loads from process upsets or mechanical shocks.<\/li>\n<li><strong>Previous repairs:<\/strong> welding or machining that leaves residual stresses behind.<\/li>\n<\/ul>\n<h2>3. Vibration Symptoms of a Cracked Shaft<\/h2>\n<h3>The characteristic 2\u00d7 component<\/h3>\n<p>The hallmark signature of a transverse shaft crack is a prominent <strong>2\u00d7 (second-harmonic)<\/strong> component, and the mechanism behind it is worth understanding precisely:<\/p>\n<ul>\n<li>As the shaft turns, the crack opens and closes twice per revolution.<\/li>\n<li>When the crack is on the compression side (lower in the rotation), it closes and the shaft is stiffer.<\/li>\n<li>When it swings to the tension side (upper in the rotation), it opens and the shaft is more flexible.<\/li>\n<li>This twice-per-revolution swing in stiffness is itself a 2\u00d7 forcing function.<\/li>\n<li>The 2\u00d7 amplitude grows as the crack deepens and the stiffness asymmetry increases \u2014 which is why the <em>trend<\/em> matters as much as the absolute level.<\/li>\n<\/ul>\n<h3>Additional vibration indicators<\/h3>\n<ul>\n<li><strong>1\u00d7 changes:<\/strong> a gradual rise in the 1\u00d7 component as changed stiffness and a residual bow develop.<\/li>\n<li><strong>Higher harmonics:<\/strong> 3\u00d7 and 4\u00d7 may appear as severity grows.<\/li>\n<li><strong>Phase shifts:<\/strong> the <a href=\"https:\/\/vibromera.eu\/gu\/glossary\/phase\/\">phase<\/a> angle changes during startup or coastdown and at different speeds.<\/li>\n<li><strong>Speed-dependent behaviour:<\/strong> vibration can vary non-linearly with speed.<\/li>\n<li><strong>Temperature sensitivity:<\/strong> readings may track thermal expansion as it opens or closes the crack.<\/li>\n<\/ul>\n<h3>Startup and coastdown behaviour<\/h3>\n<ul>\n<li>The 2\u00d7 component behaves unusually during transients.<\/li>\n<li>\u0a8f <a href=\"https:\/\/vibromera.eu\/gu\/glossary\/bode-plot\/\">Bode plot<\/a> may show two resonant peaks, one at half of each critical speed, as the 2\u00d7 excitation sweeps through.<\/li>\n<li>The phase progression of the 1\u00d7 component can differ markedly from a normal unbalance response.<\/li>\n<\/ul>\n<h2>4. Detection Methods<\/h2>\n<h3>Vibration monitoring and field measurement<\/h3>\n<p>Because the warning is spectral and progressive, regular measurement is the front line of defence:<\/p>\n<ul>\n<li><strong>Trending:<\/strong> watch the 2\u00d7\/1\u00d7 ratio over time; a steady climb is a warning, and a ratio above roughly 0.5 warrants investigation. Sudden pattern changes are equally suspicious.<\/li>\n<li><strong>Spectral analysis:<\/strong> routine <a href=\"https:\/\/vibromera.eu\/gu\/glossary\/fft\/\">FFT<\/a> measurements, compared against a historical <a href=\"https:\/\/vibromera.eu\/gu\/glossary\/baseline\/\">baseline<\/a>, expose the emergence or growth of a 2\u00d7 peak.<\/li>\n<li><strong>Transient analysis:<\/strong> <a href=\"https:\/\/vibromera.eu\/gu\/glossary\/waterfall-plot\/\">waterfall plots<\/a> and Bode plots from startup and coastdown reveal unusual behaviour at critical-speed passages.<\/li>\n<\/ul>\n<p>Capturing amplitude and phase of the 1\u00d7 and 2\u00d7 components is exactly the measurement a portable two-channel analyser makes routine. With a phase-referenced instrument such as the <a href=\"https:\/\/vibromera.eu\/gu\/%e0%aa%89%e0%aa%a4%e0%ab%8d%e0%aa%aa%e0%aa%be%e0%aa%a6%e0%aa%a8\/balanset-1\/\">\u0aac\u0ac7\u0ab2\u0abe\u0aa8\u0acd\u0ab8\u0ac7\u0a9f-1 \u0a8f<\/a>, a technician can log the 1\u00d7 and 2\u00d7 vectors at the bearings during normal running and on each coastdown, building the trend that distinguishes a benign 2\u00d7 from one that is marching upward \u2014 the difference between a planned shutdown and an unplanned wreck.<\/p>\n<h3>Non-vibration methods<\/h3>\n<p>A suspicious vibration trend should always be confirmed by direct <a href=\"https:\/\/vibromera.eu\/gu\/glossary\/non-destructive-testing\/\">non-destructive testing<\/a>:<\/p>\n<ul>\n<li><strong>Magnetic particle inspection (MPI):<\/strong> finds surface and near-surface cracks with high reliability on accessible ferromagnetic shafts; a staple of routine outage inspections.<\/li>\n<li><strong>Ultrasonic testing (UT):<\/strong> detects internal and surface cracks and can find them before any vibration symptom appears; needs specialist equipment and trained personnel, and is the method of choice for critical shafts.<\/li>\n<li><strong>Dye penetrant inspection:<\/strong> a simple surface-crack method requiring cleaning and surface preparation, useful for accessible areas during an outage.<\/li>\n<li><strong>Eddy-current testing:<\/strong> non-contact surface-crack detection that suits automated inspection and works on both magnetic and non-magnetic materials.<\/li>\n<\/ul>\n<h2>5. Response and Corrective Actions<\/h2>\n<h3>Immediate actions on detection<\/h3>\n<ol>\n<li><strong>Increase monitoring frequency:<\/strong> step up from monthly to weekly or daily.<\/li>\n<li><strong>Reduce operating severity:<\/strong> lower speed or load where possible.<\/li>\n<li><strong>Plan a shutdown:<\/strong> schedule repair or replacement at the earliest safe opportunity.<\/li>\n<li><strong>Perform NDE:<\/strong> confirm the crack&#8217;s presence and assess its severity directly.<\/li>\n<li><strong>Risk assessment:<\/strong> decide formally whether continued operation is safe.<\/li>\n<\/ol>\n<h3>Long-term solutions<\/h3>\n<ul>\n<li><strong>Shaft replacement:<\/strong> the most reliable remedy for a confirmed crack.<\/li>\n<li><strong>Repair (limited cases):<\/strong> some cracks can be machined out and built up with weld, but only after expert evaluation.<\/li>\n<li><strong>Root-cause analysis:<\/strong> establish why the crack formed so it does not recur.<\/li>\n<li><strong>Design modifications:<\/strong> relieve stress concentrations, improve material selection, or change the operating regime.<\/li>\n<\/ul>\n<h2>6. Prevention Strategies<\/h2>\n<h3>Design phase<\/h3>\n<ul>\n<li>Eliminate sharp corners and stress concentrations.<\/li>\n<li>Use generous fillet radii at diameter changes.<\/li>\n<li>Specify materials appropriate to the stress level and environment.<\/li>\n<li>Perform finite-element stress analysis on critical geometry.<\/li>\n<li>Apply surface treatments such as shot peening or nitriding to raise fatigue resistance.<\/li>\n<\/ul>\n<h3>Operational phase<\/h3>\n<ul>\n<li>Maintain good <a href=\"https:\/\/vibromera.eu\/gu\/glossary\/balance-quality\/\">balance quality<\/a> to minimise cyclic bending stress.<\/li>\n<li>Ensure precision alignment.<\/li>\n<li>Avoid sustained operation at critical speeds.<\/li>\n<li>Prevent overspeed events.<\/li>\n<li>Control thermal stress with proper warm-up and cooldown procedures.<\/li>\n<\/ul>\n<h3>Maintenance phase<\/h3>\n<ul>\n<li>Inspect regularly using the appropriate NDE methods.<\/li>\n<li>Run a vibration <a href=\"https:\/\/vibromera.eu\/gu\/glossary\/trending\/\">trending<\/a> programme to catch early symptoms.<\/li>\n<li>Re-balance periodically to keep fatigue stresses low \u2014 on-site <a href=\"https:\/\/vibromera.eu\/gu\/glossary\/field-balancing\/\">field balancing<\/a> makes this practical without removing the rotor.<\/li>\n<li>Maintain corrosion protection and coatings.<\/li>\n<\/ul>\n<p>Shaft cracks represent one of the gravest failure modes in rotating machinery, where the consequence of missing one is measured in destroyed assets and endangered people. The combination is what works: vibration monitoring to flag the characteristic 2\u00d7 signature early, and periodic non-destructive examination to confirm and size what the vibration only hints at. Together they allow planned, controlled maintenance \u2014 and keep a quiet hairline from becoming a sudden, violent fracture.<\/p>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/gu\/glossary\/\">\u2190 Back to Main Index<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Learn about shaft cracks in rotating machinery, their causes, characteristic vibration signatures including 2X components, and critical detection methods to prevent catastrophic failure.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[109,110],"tags":[],"class_list":["post-234","glossary","type-glossary","status-publish","hentry","category-glossary","category-vibration-diagnostics"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/gu\/wp-json\/wp\/v2\/glossary\/234","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/gu\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/gu\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/gu\/wp-json\/wp\/v2\/glossary\/234\/revisions"}],"predecessor-version":[{"id":101407,"href":"https:\/\/vibromera.eu\/gu\/wp-json\/wp\/v2\/glossary\/234\/revisions\/101407"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/gu\/wp-json\/wp\/v2\/media?parent=234"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/gu\/wp-json\/wp\/v2\/categories?post=234"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/gu\/wp-json\/wp\/v2\/tags?post=234"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}