Industrial Equipment, Machinery & Capital Goods worked example
Engineering Hours per Machine at 29% design review and rework allowance: a worked example
What does the result look like when design review and rework allowance reaches 29%? The full calculation is worked below with real intermediate numbers. Use it when sizing mechanical, electrical, controls, safety, and documentation effort for a custom equipment build.
The inputs for this scenario
- Engineering deliverables or task points: 96 tasks (unchanged)
- Engineering completion throughput: 3.2 tasks / hr (unchanged)
- Design review and rework allowance: 29 % (raised for this scenario; the documented default is 25)
Working through the calculation
- Applying the documented formula (Base engineering time = engineering deliverables or task points รท engineering completion throughput) to the inputs above produces each figure below.
- At this operating point the engine returns 38.7 hr for required engineering hours per machine, the number this scenario is built around.
- At this operating point the engine returns 30 hr for base engineering time.
- At this operating point the engine returns 29 % for design review and rework allowance.
- At this operating point the engine returns 3.2 pieces / min for engineering completion throughput.
How this compares with the baseline
- Against the tool's baseline example, where design review and rework allowance sits at 25% and the headline result is 37.5 hr, this scenario comes in 3.2% above the baseline at 38.7 hr.
- A figure at this level is achievable when design review and rework allowance is genuinely sustained, not just peaked for a shift. Throughput and task counts assume work of comparable complexity; a few genuinely novel deliverables can blow the average even if the task count is right.
Results at a glance
- Required engineering hours per machine: 38.7 hr (headline result)
- Base engineering time: 30 hr
- Design review and rework allowance: 29 %
- Engineering completion throughput: 3.2 pieces / min
Run it with your numbers
- Every input above is editable in the live Engineering Hours per Machine calculator, which recalculates instantly and can be shared with the inputs intact.
Last reviewed 2026-05-12.