Rotational Molding worked example
Insert Loading Time at 12% fatigue and handling allowance: a worked example
What does the result look like when fatigue and handling allowance reaches 12%? The full calculation is worked below with real intermediate numbers. Use it when insert loading time in rotational molding needs a defensible run time before a quote goes out.
The inputs for this scenario
- Insert placements required this batch: 120 units (unchanged)
- Inserts loaded per operator-hour: 12 units / hr (unchanged)
- Fatigue and handling allowance: 12 % (raised for this scenario; the documented default is 10)
Working through the calculation
- Applying the documented formula (Base insert loading time time = required work รท processing rate) to the inputs above produces each figure below.
- At this operating point the engine returns 11.2 hr for adjusted run time, the number this scenario is built around.
- At this operating point the engine returns 10 hr for base run time.
- At this operating point the engine returns 12 % for allowance applied.
- At this operating point the engine returns 12 pieces / min for process rate.
How this compares with the baseline
- Against the tool's baseline example, where fatigue and handling allowance sits at 10% and the headline result is 11 hr, this scenario comes in 1.82% above the baseline at 11.2 hr.
- A figure at this level is achievable when fatigue and handling allowance is genuinely sustained, not just peaked for a shift. It assumes a steady placement rate; in reality the first parts of a run are slower until the operator settles into a rhythm, and jig changeovers between insert types are not captured.
Results at a glance
- Adjusted run time: 11.2 hr (headline result)
- Base run time: 10 hr
- Allowance applied: 12 %
- Process rate: 12 pieces / min
Run it with your numbers
- Every input above is editable in the live Insert Loading Time calculator, which recalculates instantly and can be shared with the inputs intact.
Last reviewed 2026-05-12.