What does the window margin tell me?

It is the alignment window minus required alignment time. A negative margin means the run overruns the bay window; you would need to start earlier, add a crew, or extend the window.

Why add the dial-indicator allowance as a percent?

Setup and shim changes repeat on every set, and a bigger set of couplings carries more of them. A percentage ties the extra time to the base alignment hours instead of a flat estimate that is wrong at both ends.

What completion rate should I enter?

Use hours actually logged on comparable sets, including coupling handling and shim selection. A rate from a clean bench job will beat a job with pipe strain, so check the last campaign before you plan.

Where does the base time come from?

Base alignment time is sets divided by the completion rate, before any allowance. The required time then adds the allowance on top, so the two rows show how much of the schedule is setup rather than alignment.

Water, Wastewater & Pump Systems Manufacturing calculator

Motor-Pump Alignment Time Calculator

Add dial-indicator setup and shimming time to the base alignment hours for a run of pump-motor sets, then compare the total with the window. The margin says whether the bay finishes the run on time.

What this calculator does

Labor hours to align a run of pump-motor sets at your completion rate, with a dial-indicator allowance and the alignment window.

Formula used

Base alignment time = pump-motor sets to align ÷ alignment sets completed per hour
Required alignment time = base time × (1 + dial-indicator allowance ÷ 100)
Allowance hours = required alignment time − base alignment time
Window margin = alignment window − required alignment time

Inputs explained

Pump-Motor Sets to Align: Pump and motor sets on the alignment schedule for this run.
Alignment Sets Completed per Hour: Sets one alignment crew completes per hour, from logged hours.
Dial-Indicator Setup and Shimming Allowance: Extra time for setup, shim changes and dial-indicator checks.
Alignment Window: Hours the alignment bay is available for this run.

How to use the result

Best suited to planning a motor-pump alignment campaign, checking a tight alignment window.
Alignment time varies with coupling size, pipe strain and shim access; one rate cannot cover every set. The model does not include vibration checks or a post-alignment run.

Current U.S. benchmarks

The U.S. has 21,668 machinery manufacturing establishments employing about 1,086,146 workers (Census County Business Patterns, 2023).

Common questions

What does the window margin tell me? It is the alignment window minus required alignment time. A negative margin means the run overruns the bay window; you would need to start earlier, add a crew, or extend the window.
Why add the dial-indicator allowance as a percent? Setup and shim changes repeat on every set, and a bigger set of couplings carries more of them. A percentage ties the extra time to the base alignment hours instead of a flat estimate that is wrong at both ends.
What completion rate should I enter? Use hours actually logged on comparable sets, including coupling handling and shim selection. A rate from a clean bench job will beat a job with pipe strain, so check the last campaign before you plan.
Where does the base time come from? Base alignment time is sets divided by the completion rate, before any allowance. The required time then adds the allowance on top, so the two rows show how much of the schedule is setup rather than alignment.

Last reviewed 2026-10-01.