Foundry & Forging worked example
Fettling Labor Load at 23% fettling allowance: a worked example
What does the result look like when fettling allowance reaches 23%? The full calculation is worked below with real intermediate numbers. Use it when finishing labor must be scheduled or quoted for castings and forgings.
The inputs for this scenario
- Castings or forgings needing fettling: 160 parts (unchanged)
- Fettling completion rate: 18 parts / hr (unchanged)
- Fettling allowance: 23 % (raised for this scenario; the documented default is 20)
Working through the calculation
- Applying the documented formula (Base fettling labor load = castings or forgings needing fettling รท fettling completion rate) to the inputs above produces each figure below.
- At this operating point the engine returns 10.93 hr for required fettling labor load, the number this scenario is built around.
- At this operating point the engine returns 8.89 hr for base fettling labor load.
- At this operating point the engine returns 23 % for fettling allowance.
- At this operating point the engine returns 18 pieces / min for fettling completion rate.
How this compares with the baseline
- Against the tool's baseline example, where fettling allowance sits at 20% and the headline result is 10.67 hr, this scenario comes in 2.5% above the baseline at 10.93 hr.
- A figure at this level is achievable when fettling allowance is genuinely sustained, not just peaked for a shift. The single completion rate assumes a consistent part mix; a batch with heavy gates, large flash or hard-to-reach pockets fettles far slower than the average rate suggests.
Results at a glance
- Required fettling labor load: 10.93 hr (headline result)
- Base fettling labor load: 8.89 hr
- Fettling allowance: 23 %
- Fettling completion rate: 18 pieces / min
Run it with your numbers
- Every input above is editable in the live Fettling Labor Load calculator, which recalculates instantly and can be shared with the inputs intact.
Last reviewed 2026-05-12.