How do you calculate accepted CMM inspection capacity?

Multiply checks per cycle by available cycles for gross capacity, then multiply by uptime and yield. Here 95 × 28 = 2,660 gross, then × 0.88 × 0.92 = 2,153.54 accepted CMM checks.

What is the difference between gross and accepted CMM capacity?

Gross capacity (2,660 checks) assumes perfect uptime and zero reruns. Accepted capacity (2,153.54) subtracts 319.2 checks lost to downtime and 187.26 lost to rejects and reruns, giving the number you can actually commit.

Why does CMM uptime matter so much?

At 88% uptime the machine is unavailable 12% of the time, costing 319.2 checks in this example. Calibration, probe changes, and unplanned maintenance all pull uptime down, so it directly caps real throughput.

How does inspection yield reduce capacity?

Checks that fail or flag marginal must be rerun, consuming cycle time. At 92% accepted yield, 187.26 checks of effective capacity are lost to reject-and-rerun even on an otherwise available machine.

How do I increase CMM inspection capacity?

Raise uptime with preventive calibration and faster probe setups, raise yield by stabilizing upstream machining so fewer features fail, or add cycles with an extra shift. Each lever attacks a different loss in the model.

Is this capacity per machine or per cell?

As entered it reflects one CMM's program cycles. For a cell, sum accepted capacity across machines or run the calculation per machine and aggregate, keeping each unit's uptime and yield separate.

Aerospace & Defense Manufacturing calculator

CMM Inspection Capacity Calculator

CMM inspection capacity is the number of dimensional checks a coordinate measuring machine can actually complete and accept over a planning period, after accounting for machine uptime and inspection yield. Aerospace quality and metrology managers use it to decide whether their CMM cell can keep up with production, where the inspection bottleneck is, and when to add a shift or a second machine. Gross capacity always overstates reality — downtime and reruns from rejected or marginal checks quietly erode throughput. Modeling those losses turns an optimistic spec-sheet number into a schedule you can commit to.

What this calculator does

Estimate accepted CMM inspection capacity from features per program cycle, available CMM cycles, uptime, and first-pass inspection yield.
a quality planner needs to check whether available CMM time can support an aerospace inspection queue
It computes accepted CMM inspection capacity by derating gross capacity for machine uptime and first-pass accepted yield, and breaks out the downtime and rerun losses.

Formula used

Gross CMM capacity = checks per cycle × available CMM cycles
Accepted CMM inspection capacity = gross capacity × CMM uptime × accepted inspection yield

Inputs explained

CMM checks per program cycle:
Available CMM program cycles:
CMM machine uptime:
Accepted first-pass inspection yield:

How to use the result

Use it for inspection capacity planning, bottleneck analysis, and justifying a second CMM or added metrology shift.
It assumes an average checks-per-cycle and uniform yield; complex first-article programs with long routines and high rework can make real accepted throughput lower than the model.

Current U.S. benchmarks

Steel mill PPI stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. New factory orders are up 2.3% year over year (Census).
The U.S. has 11,691 transportation equipment establishments employing about 1,682,910 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate accepted CMM inspection capacity? Multiply checks per cycle by available cycles for gross capacity, then multiply by uptime and yield. Here 95 × 28 = 2,660 gross, then × 0.88 × 0.92 = 2,153.54 accepted CMM checks.
What is the difference between gross and accepted CMM capacity? Gross capacity (2,660 checks) assumes perfect uptime and zero reruns. Accepted capacity (2,153.54) subtracts 319.2 checks lost to downtime and 187.26 lost to rejects and reruns, giving the number you can actually commit.
Why does CMM uptime matter so much? At 88% uptime the machine is unavailable 12% of the time, costing 319.2 checks in this example. Calibration, probe changes, and unplanned maintenance all pull uptime down, so it directly caps real throughput.
How does inspection yield reduce capacity? Checks that fail or flag marginal must be rerun, consuming cycle time. At 92% accepted yield, 187.26 checks of effective capacity are lost to reject-and-rerun even on an otherwise available machine.
How do I increase CMM inspection capacity? Raise uptime with preventive calibration and faster probe setups, raise yield by stabilizing upstream machining so fewer features fail, or add cycles with an extra shift. Each lever attacks a different loss in the model.

Last reviewed 2026-05-12.