Eyewear, Lenses & Vision Products worked example

Frame Assembly Labor at 14% adjustment and hardware allowance: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop adjustment and hardware allowance to 14%, then walk the calculation through step by step. Estimate labor hours to mount lenses, adjust frames, install hardware, and complete finished-pair assembly.

The inputs for this scenario

  • Finished pairs to assemble: 180 pairs (held at the documented default)
  • Frame assembly throughput: 30 pairs / hr (held at the documented default)
  • Adjustment and hardware allowance: 14 % (the input this scenario stresses; the baseline uses 20)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base frame assembly hours = finished pairs to assemble รท frame assembly throughput.
  • Required frame assembly labor hours works out to 6.84 hr at these inputs, and this is the headline figure for the scenario.
  • Base frame assembly hours works out to 6 hr at these inputs.
  • Adjustment and hardware allowance works out to 14 % at these inputs.
  • Frame assembly throughput works out to 30 pairs / hr at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where adjustment and hardware allowance sits at 20% and the headline result is 7.2 hr, this scenario comes in 5% below the baseline at 6.84 hr.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to adjustment and hardware allowance, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It assumes a steady assembly rate; complex frames (rimless, drill-mounts, specialty hinges) run far slower than the average and can break the estimate if mixed in heavily.

Results at a glance

  • Required frame assembly labor hours: 6.84 hr (headline result)
  • Base frame assembly hours: 6 hr
  • Adjustment and hardware allowance: 14 %
  • Frame assembly throughput: 30 pairs / hr

Run it with your numbers

  • To rerun this with your own numbers, open the live Frame Assembly Labor calculator, set adjustment and hardware allowance to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.