Mass Finishing, Deburring & Polishing calculator
Rework Reduction Savings Calculator
Rework Reduction Savings converts a finishing cell's output and runtime into an effective throughput rate that accounts for yield losses from re-tumbling, re-polishing, and touch-up. Continuous-improvement engineers and finishing leads use it to quantify how much real capacity a deburr or polish line gives up to rework, and to put a number on the gain when a process change cuts second passes. The gap between raw and effective throughput is exactly the hidden cost of burrs that survive the first cycle. It turns a fuzzy 'we do a lot of rework' complaint into a defensible parts-per-hour figure.
What this calculator does
- Calculate rework reduction savings for mass finishing, deburring & polishing planning, quoting, troubleshooting, capacity review, or process improvement.
- Use it when rework reduction savings in mass finishing, deburring and polishing is being committed and you need a throughput number you can defend.
- It computes raw throughput (good parts divided by runtime) and effective throughput after applying the cell's yield efficiency.
Formula used
- Raw rework reduction savings = completed output ÷ runtime
- Effective rework reduction savings = raw throughput × efficiency
Inputs explained
- Good parts after rework reduction:
- Finishing cell runtime:
- Cell yield efficiency:
How to use the result
- Use it to baseline a finishing line before a process change and to measure the throughput recovered when rework drops.
- It models efficiency as a single flat percentage and does not separate first-pass yield from scrap, nor does it weight parts of different finishing difficulty.
Common questions
- How do you calculate finishing throughput? Divide good parts by runtime for raw throughput, then multiply by yield efficiency. With 1,200 parts over 8 hours at 90% efficiency, raw is 150 units/hr and effective is 135 units/hr.
- What does effective throughput tell me that raw doesn't? Raw throughput assumes every part clears on the first pass. Effective throughput discounts for rework and yield loss, so the 15 units/hr gap (150 vs 135) is the capacity your rework is eating.
- What is a good yield efficiency for a deburring cell? Well-tuned vibratory and centrifugal cells run 90-98% first-pass yield on typical metal parts. Below 85% you are paying for frequent second passes and should review media, compound, or cycle time.
- How much capacity does rework actually cost me? In the example, dropping from 90% to 100% efficiency would recover 15 units/hr — 120 parts across an 8-hour shift — without buying any new equipment.
- Raw throughput vs effective throughput — which do I quote? Quote effective throughput for capacity planning and delivery promises, since it reflects parts that actually pass inspection. Use raw throughput only to size theoretical machine capacity.
Last reviewed 2026-05-12.