Why compare good door units with a required count?

Because the rig only counts when it releases doors the program can fit. Gross throughput can look comfortable while yield losses leave the delivery plan short. The required count turns the capacity estimate into a yes or no.

Does uptime include planned maintenance?

Enter the uptime you truly expect. Planned maintenance is not production time, so take it out of the scheduled cycles or fold it into the uptime figure. Keep that treatment consistent with how the cycle count was built.

What yield should a new test rig assume?

Start with the first-pass yield of comparable rigs and door families. A new fixture often yields worse for the first weeks, so a pilot run gives a better number than a target from a mature line.

How do door variants change the result?

A variant with a longer test or extra setup consumes more cycle time. Run the calculation once per variant and add the good counts when the rig shares time between them.

Rail, Transit & Rolling Stock Manufacturing calculator

Door System Test Capacity Calculator

Test rig capacity is rarely just doors per cycle times cycles. This page prices rig downtime and first-pass yield into the confirmed count, then compares it with the door units the program needs.

What this calculator does

Validated door units a test rig delivers after uptime and yield losses, judged against the door count a program requires.

Formula used

Gross door units = doors per cycle × scheduled test cycles
Downtime loss = gross × (1 − uptime ÷ 100)
Yield loss = units after downtime × (1 − yield ÷ 100)
Good door units = gross − downtime loss − yield loss
Capacity versus demand = good door units ÷ required door units × 100

Inputs explained

Doors per Test Cycle: Doors the rig validates in one test cycle.
Scheduled Test Cycles: Test cycles the schedule allows for door validation.
Test Rig Uptime: Share of scheduled cycles the rig is ready.
First-Pass Yield: Doors passing endurance and leak tests first time.
Required Door Units: Door units the program must have tested.

How to use the result

Best suited to sizing a door endurance test rig, checking a test plan against release dates, justifying a second rig or shift.
One door family and one test duration: mixed variants with longer endurance runs need their own pass. Rework that returns doors to the rig lowers effective yield; track it as a separate loop.

Current U.S. benchmarks

Steel mill PPI stands at 381.162 (BLS, Aug 2026), up 23.4% from a year earlier. New factory orders are up 8.5% 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

Why compare good door units with a required count? Because the rig only counts when it releases doors the program can fit. Gross throughput can look comfortable while yield losses leave the delivery plan short. The required count turns the capacity estimate into a yes or no.
Does uptime include planned maintenance? Enter the uptime you truly expect. Planned maintenance is not production time, so take it out of the scheduled cycles or fold it into the uptime figure. Keep that treatment consistent with how the cycle count was built.
What yield should a new test rig assume? Start with the first-pass yield of comparable rigs and door families. A new fixture often yields worse for the first weeks, so a pilot run gives a better number than a target from a mature line.
How do door variants change the result? A variant with a longer test or extra setup consumes more cycle time. Run the calculation once per variant and add the good counts when the rig shares time between them.

Last reviewed 2026-10-01.