Signed straight-line correction geometry · documented alignment solution

Documented Vertical Foot-Move Geometry Worksheet

Project a controlled signed vertical correction at a reference plane and a controlled correction slope to two signed foot-plane coordinates, while preserving the measurement and installation record.

+ add / elevate− remove / lowerNo automatic shim stack

Geometry only—not a complete alignment instruction. Enter required corrections already produced by a validated alignment method, not raw dial/laser readings. The worksheet does not calculate coupling tolerances, choose stock shims, correct soft foot, model thermal growth or authorize moving a machine. Isolate equipment and follow the controlled work procedure.

Signed correction line and foot coordinates

Required vertical move at reference plane x = 0

Signed: positive = elevate/add; negative = lower/remove.

Required correction slope

Signed rise along +x. 1 mm/m = 1 mil/in = 0.001.

Signed x-coordinate of front foot plane

Signed x-coordinate of rear foot planeUses the same coordinate unit and origin as the front foot. The two coordinates must differ.

Project / machine train

Movable and stationary machine identifiers

Reference plane x = 0 / coordinate direction

Alignment method / measurement configuration

Instrument / firmware / calibration ID

Source readings / solution report ID

Coupling targets / sign convention record

Distance survey / foot-plane record

Soft foot / runout / pipe strain / base checks

Offline-to-running / thermal target basis

Hold-down bolt / torque / sequence procedure

Available installed shim / chock and stack limits

Controlled tolerance / acceptance source

Prepared / reviewed by

Record date

Notes and exclusions Optional: coupling state, bracket sag, backlash, repeatability, pipe connection, foot-specific corrections

The entered reference-plane move and slope are required machine corrections from a validated alignment solution—not raw face/rim gaps, offsets or unprocessed sensor readings. Positive vertical move means physically elevate the movable machine at that plane; negative means lower it, subject to the available installed shim/chock arrangement. Both signed foot coordinates use the documented x = 0 plane and +x direction, and all targets, thermal movement and measurement corrections are already included as required. Soft foot and other pre-alignment conditions will be corrected, equipment will be safely isolated, and final alignment will be remeasured after tightening under the controlled procedure.

Ideal straight-line moves

Front foot-plane signed move

Rear foot-plane signed move

Rear minus front differential

Normalized reference correction

Normalized slope

Normalized front / rear coordinates

Equation, units and sign

Let the required signed vertical correction line be y(x), with reference move c at x = 0 and signed slope q expressed per 1000 length units:

y(x) = c + (q / 1000) x
front move = c + (q / 1000) x_F
rear move = c + (q / 1000) x_R

This is an affine straight-line projection, not a shaft-alignment tolerance or an ISO/ANSI formula claim. Because both 1 mm/m and 1 mil/in equal 0.001 as a dimensionless slope, their numerical values are identical. Exact conversions are 1 in = 25.4 mm and 1 mil = 0.0254 mm.

Output sign is never discarded: positive means add/elevate; negative means remove/lower; zero means no ideal vertical move at that plane. The actual foot-specific shim/chock action can be constrained by existing stacks, soft foot and the approved work method.

Model boundary and removed unsafe logic

No contradictory sign selector. The former page labelled positive coupling offset as “motor high,” but separately asked add/remove and then ignored that selector, used absolute values and printed the selected action. A required downward move could therefore be displayed as “add.”
No raw face-gap shortcut. The former angle/D_spojka conversion silently assumed a specific measurement geometry, small-angle interpretation, sign convention and reference plane. Enter the signed correction slope already produced by the controlled alignment solution.
No automatic shim combination. A greedy list of nominal sizes is not a verified inventory, cannot account for existing stacks or compression/condition, and could leave an unreported residual. This worksheet reports ideal signed moves only.
No universal shim-size/color table or stack rule. Available thicknesses, materials, colour codes, minimum/maximum stack and chock practice are manufacturer/site controlled. Exact values are NEEDS_LICENSED_SOURCE.
No unsourced speed-tolerance table. Alignment tolerances depend on coupling/machine configuration, operating targets and the applicable controlled method. The former generic RPM table and FAQ values were removed.
No one-coefficient thermal-growth estimate. Offline-to-running movement can involve both machines, supports, piping and measured/engineered targets. A single steel αLΔT estimate does not establish the required coupling target.
Pre-alignment conditions matter. Soft foot, runout, pipe strain, bearing clearance, base condition and hold-down response can invalidate a mathematically correct move.
Remeasure after correction. Calculated ideal moves do not prove achieved alignment. Tightening and machine response can change the result.

Source traceability

Claim	Klasifikace	Evidence
Shaft-alignment methodology covers measurement, analysis, correction, documentation and mounting conditions for its stated configuration	Current standard scope/status only; exact formulas/tolerances licensed	ASA/ANSI S2.75-2017/Part 1 (R2025); official ASA catalogue lists the 2017 document reaffirmed in 2025
Part 1 scope is flexible-coupled shafts in independent horizontally mounted machine cases; rigid coupling and other configurations require different treatment	Official public abstract/scope	Same ASA/ANSI standard record; exact applicability must be checked in the controlled edition
Soft foot should be corrected before alignment; relevant pre-alignment checks include runout, pipe strain, thermal movement and bearing-clearance checks	Official manufacturer application guidance	Acoem AT-010 pre-alignment guidance
1 in = 25.4 mm exactly; therefore 1 mil = 0.0254 mm	Exact SI conversion	NIST SP 811, Appendix B.8
y = c + sx and dimensional projection	General analytic geometry; not a standard formula	Direct derivation shown above

Accessed: 15 July 2026. Public sources establish scope/status and pre-alignment factors, not a project tolerance, raw-reading reduction, shim catalogue, stack limit or authorization to move equipment. Worksheet URL: https://vibromera.eu/calculators/shim-thickness-calculator/

Arithmetic reference example

For c = +0.15 mm, q = +0.5 mm/m, x_F = +200 mm and x_R = +450 mm: front = +0.25 mm; rear = +0.375 mm; rear − front = +0.125 mm. This verifies the signed projection only and is not an alignment tolerance or shim-stack recommendation.

Questions

Can I enter a coupling face-gap difference as the slope?

Not directly unless your controlled measurement method explicitly converts that reading to the same signed correction slope and reference convention. Bracket geometry, diameter, sag, sign and measurement method can change the reduction.

Does +0.25 mm always mean add a 0.25 mm shim?

It means the ideal foot-plane elevation is +0.25 mm. The approved physical action depends on installed shims/chocks, foot condition, angular soft foot and the work procedure; remeasurement is mandatory.

Where are the alignment tolerances?

No universal table is embedded. Use the exact controlled OEM/project requirement or applicable ASA/ANSI S2.75 part and edition for the actual machine/coupling configuration. Exact criteria remain NEEDS_LICENSED_SOURCE.

Why are thermal-growth calculations not included?

Required offline targets depend on relative movement of the complete machine train and supports, not a single generic steel expansion estimate. Enter targets already established by the controlled engineering or measured OLTR method.