Bearings, Gears & Power Transmission worked example

Gearbox Assembly Labor at 25% alignment and check allowance: a worked example

What does the result look like when alignment and check allowance reaches 25%? The full calculation is worked below with real intermediate numbers. a gearbox manufacturer or repair shop needs to schedule assembly labor for reducers, gearboxes, or drive units

The inputs for this scenario

  • Gearboxes to assemble: 36 gearboxes (unchanged)
  • Verified assembly rate: 2.4 gearboxes / hr (unchanged)
  • Alignment and check allowance: 25 % (raised for this scenario; the documented default is 22)

Working through the calculation

  • Applying the documented formula (Base gearbox assembly time = gearboxes to assemble รท verified assembly rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 18.75 hr for required gearbox assembly labor, the number this scenario is built around.
  • At this operating point the engine returns 15 hr for base gearbox assembly time.
  • At this operating point the engine returns 25 % for alignment and check allowance.
  • At this operating point the engine returns 2.4 gearboxes / hr for verified assembly rate.

How this compares with the baseline

  • Against the tool's baseline example, where alignment and check allowance sits at 22% and the headline result is 18.3 hr, this scenario comes in 2.46% above the baseline at 18.75 hr.
  • A figure at this level is achievable when alignment and check allowance is genuinely sustained, not just peaked for a shift. It assumes one verified rate for the whole run, so a learning curve on a new gearbox variant or builds that mix easy and complex units will diverge from the estimate.

Results at a glance

  • Required gearbox assembly labor: 18.75 hr (headline result)
  • Base gearbox assembly time: 15 hr
  • Alignment and check allowance: 25 %
  • Verified assembly rate: 2.4 gearboxes / hr

Run it with your numbers

  • Every input above is editable in the live Gearbox Assembly Labor calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.