How do you calculate gear tooth inspection workload?

Divide the number of features or gears by the inspection rate to get base time, then multiply by one plus the setup-and-recheck allowance. With 360 features at 45 per hour the base is 8 hours, and a 25% allowance brings the required workload to 10 hours.

What is a typical setup and recheck allowance for gear inspection?

Allowances of 15-35% are common depending on fixture complexity and how many teeth get re-measured for verification. The 25% used here adds 2 hours to an 8-hour base. Tight aerospace or wind gears with first-article rechecks push toward the high end.

Why not just use the base inspection time?

Base time only counts probing the features. Real inspection includes fixturing the gear, qualifying the probe, aligning datums, and re-measuring suspect teeth. Ignoring that allowance is why metrology cells routinely blow past their planned hours.

How do I speed up gear tooth inspection?

Raise the inspection rate with faster CMM scanning or a dedicated analytical gear checker, reduce the feature count by sampling teeth instead of 100% where the customer permits, and cut setup time with quick-change fixtures. Rate and feature count drive the base; the allowance shrinks with better fixturing.

Should I inspect every tooth or sample?

It depends on the standard. AGMA or customer specs may require checking a defined subset of teeth (often three or four spaced around the gear) rather than all of them. Sampling lowers the feature count fed into this calculator and can dramatically cut workload on high-tooth-count gears.

Does this cover both gears and individual features?

Yes, enter whatever your inspection rate is expressed in. If your rate is features per hour, count features; if it is gears per hour, count gears. Keep the unit of the count and the rate consistent or the base time will be wrong.

Bearings, Gears & Power Transmission calculator

Gear Tooth Inspection Workload Calculator

Gear tooth inspection workload is the labor time required to inspect a set of gear teeth or features on a CMM, gear analyzer, or with hand gauging, including the setup and recheck overhead that base rate alone ignores. Quality engineers and metrology cell leads in gear plants use it to staff inspection, schedule analytical gear-checker time, and quote inspection-heavy aerospace or wind gearing. Profile, lead, pitch, and runout checks add up fast across many teeth, and the setup-and-recheck allowance is what separates an optimistic estimate from the real clock. Getting this number right keeps the inspection cell from becoming a silent bottleneck behind hobbing and grinding.

What this calculator does

Estimate inspection hours for gear teeth from inspected features, inspection rate, and allowance for setup, charting, or rechecks.
a gear manufacturer needs to schedule CMM, gear checker, or manual tooth inspection workload for a production lot
It computes the total hours to inspect a batch of gear teeth or features by converting feature count to base time and adding a setup-and-recheck allowance.

Formula used

Base tooth inspection time = tooth features or gears to inspect ÷ tooth inspection rate
Required tooth inspection workload = base inspection time × setup and recheck allowance factor

Inputs explained

Tooth features or gears to inspect:
Tooth inspection rate:
Setup and recheck allowance:

How to use the result

Use it when staffing a metrology cell, scheduling analytical gear-checker time, or quoting inspection-intensive gear work.
It assumes a steady inspection rate and a single allowance factor, so it does not separate first-article from in-process checks or model learning-curve speedups.

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

How do you calculate gear tooth inspection workload? Divide the number of features or gears by the inspection rate to get base time, then multiply by one plus the setup-and-recheck allowance. With 360 features at 45 per hour the base is 8 hours, and a 25% allowance brings the required workload to 10 hours.
What is a typical setup and recheck allowance for gear inspection? Allowances of 15-35% are common depending on fixture complexity and how many teeth get re-measured for verification. The 25% used here adds 2 hours to an 8-hour base. Tight aerospace or wind gears with first-article rechecks push toward the high end.
Why not just use the base inspection time? Base time only counts probing the features. Real inspection includes fixturing the gear, qualifying the probe, aligning datums, and re-measuring suspect teeth. Ignoring that allowance is why metrology cells routinely blow past their planned hours.
How do I speed up gear tooth inspection? Raise the inspection rate with faster CMM scanning or a dedicated analytical gear checker, reduce the feature count by sampling teeth instead of 100% where the customer permits, and cut setup time with quick-change fixtures. Rate and feature count drive the base; the allowance shrinks with better fixturing.
Should I inspect every tooth or sample? It depends on the standard. AGMA or customer specs may require checking a defined subset of teeth (often three or four spaced around the gear) rather than all of them. Sampling lowers the feature count fed into this calculator and can dramatically cut workload on high-tooth-count gears.

Last reviewed 2026-05-12.