How do you calculate accepted noise-test capacity?

Multiply units per cycle by available cycles for gross output, then multiply by stand uptime and first-pass yield. With 4 units/cycle over 150 cycles at 90% uptime and 97% yield, gross is 600 units and accepted capacity is 524 good units.

What is a good first-pass yield on a noise test?

For mature bearing and gear lines, 95-99% first-pass on the noise/NVH stand is typical. The 97% in the example loses about 16 units to retest or teardown. Falling below 93% usually points to upstream grinding, assembly, or contamination issues, not the test itself.

Why does uptime matter so much for test capacity?

The test stand is often a single shared resource, so every percent of downtime is throughput you cannot recover. At 90% uptime the example loses 60 of 600 gross units, more than three times the yield loss. Improving stand availability often beats chasing yield.

Gross tested units vs accepted capacity, what is the difference?

Gross tested units (600) is what the stand could process if everything passed and never went down. Accepted capacity (524) is what survives downtime and first-pass rejection, and is the only number you should promise to customers.

How do I increase noise-test capacity?

Add cycles or units per cycle to raise gross volume, improve stand uptime through preventive maintenance, or fix the upstream causes of noise rejects to lift first-pass yield. The biggest lever in the example is uptime, since downtime costs 60 units versus 16 from yield.

Should I plan to my gross or accepted number?

Always plan to accepted capacity. Promising the 600 gross figure ignores the 76 units lost to downtime and rejects, and will make you miss commitments. The 524 accepted figure is your realistic shippable ceiling.

Bearings, Gears & Power Transmission calculator

Noise Test Capacity Calculator

Noise-test capacity is the number of bearings or gearsets a noise/vibration test stand can accept and pass in a planning period, after downtime and first-pass yield are taken into account. Quality and production planners in bearing and gear plants use it to commit to ship dates, size NVH (noise, vibration, harshness) test cells, and spot when the audible-noise station is the true bottleneck rather than machining. Because customers reject units that hum, whine, or rumble, gross throughput overstates what you can actually deliver. This calculator strips out the units lost to stand downtime and to retest, so the number you plan against is shippable good parts.

What this calculator does

Estimate accepted NVH or runout noise-test output from units per test cycle, available cycles, stand uptime, and first-pass pass rate.
a power transmission manufacturer needs to verify whether noise or vibration test stands can clear the production schedule
It computes how many units a noise-test stand can accept and pass after applying stand uptime and first-pass yield to gross tested volume.

Formula used

Gross units tested = units tested per cycle × available noise-test cycles
Accepted noise-test capacity = gross units × noise-test stand uptime × first-pass noise-test yield

Inputs explained

Units tested per test cycle:
Available noise-test cycles:
Noise-test stand uptime:
First-pass noise-test yield:

How to use the result

Use it when committing ship quantities, sizing an NVH test cell, or checking whether the noise station limits line output.
It uses single-pass yield and does not credit units recovered after teardown and retest, so true shippable volume may be slightly higher if rework is effective.

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 accepted noise-test capacity? Multiply units per cycle by available cycles for gross output, then multiply by stand uptime and first-pass yield. With 4 units/cycle over 150 cycles at 90% uptime and 97% yield, gross is 600 units and accepted capacity is 524 good units.
What is a good first-pass yield on a noise test? For mature bearing and gear lines, 95-99% first-pass on the noise/NVH stand is typical. The 97% in the example loses about 16 units to retest or teardown. Falling below 93% usually points to upstream grinding, assembly, or contamination issues, not the test itself.
Why does uptime matter so much for test capacity? The test stand is often a single shared resource, so every percent of downtime is throughput you cannot recover. At 90% uptime the example loses 60 of 600 gross units, more than three times the yield loss. Improving stand availability often beats chasing yield.
Gross tested units vs accepted capacity, what is the difference? Gross tested units (600) is what the stand could process if everything passed and never went down. Accepted capacity (524) is what survives downtime and first-pass rejection, and is the only number you should promise to customers.
How do I increase noise-test capacity? Add cycles or units per cycle to raise gross volume, improve stand uptime through preventive maintenance, or fix the upstream causes of noise rejects to lift first-pass yield. The biggest lever in the example is uptime, since downtime costs 60 units versus 16 from yield.

Last reviewed 2026-05-12.