How do you calculate EOAT rework cost?

Multiply the assemblies flagged by the disassembly-and-rebuild labor per unit and by the share that truly needs rework, then add the test fixture and root-cause setup. For 70 flagged units at $110, 55% needing rework, plus $900 setup, the total is $5,135.

Why apply a 'share needing true rework' factor?

Flagging isn't the same as failing. Many EOAT assemblies flagged in inspection pass on retest or need only a minor adjustment. Applying the 55% share means you fund the 4,235 dollars of real teardown labor, not the full flagged population.

What is the rework cost per flagged assembly?

Divide the total by the number flagged. Here $5,135 across 70 flagged assemblies is $73.36 each, which is the number to compare against your target rework budget per unit.

What is a good rework rate for gripper builds?

Mature EOAT build lines aim for a true-rework share under 20-30% of flagged units; a 55% share like the example signals a process or design issue — often finger alignment fixturing or wiring — worth a root-cause pass.

Should the root-cause setup be a fixed cost?

Yes. Building a test fixture and running root-cause analysis is a one-time expense per investigation. In the example it's the $900 fixed adder on top of the $4,235 variable rework labor.

Rework cost vs scrap cost — which matters more?

Rework preserves the assembly but consumes labor; scrap discards material. Track both — if rework per unit approaches the cost of a new build, scrapping and rebuilding fresh is often the better call.

Robotic End-of-Arm Tooling calculator

Rework Cost Calculator

Rework cost is what it takes to strip down, correct, and rebuild EOAT assemblies that fail inspection or acceptance testing before or after they reach a robot cell. Manufacturing engineers and quality leads track it because gripper builds involve precise finger alignment, sensor wiring, and pneumatic routing that are easy to get wrong and expensive to fix once assembled. Not every flagged unit truly needs rework — some clear on retest — so the metric separates the share that genuinely requires teardown from the total flagged population. Getting this number right keeps rework from silently consuming build capacity and margin.

What this calculator does

Estimate the cost of reworking assembled EOAT grippers or tool-changers that fail functional or leak-down test.
you want to quantify what a batch of failed gripper or tool-changer builds will cost to rebuild and retest before shipment.
It computes the total dollars to rework the fraction of flagged EOAT assemblies that genuinely need teardown and rebuild, plus a fixed root-cause setup cost, and the cost per flagged assembly.

Formula used

Rework cost = EOAT assemblies flagged x disassembly and rebuild labor per unit x share needing true rework + test fixture and root-cause setup
Cost per flagged assembly = total rework cost / EOAT assemblies flagged

Inputs explained

EOAT assemblies flagged:
Disassembly and rebuild labor per unit:
Share needing true rework:
Test fixture and root-cause setup:

How to use the result

Use it during build acceptance, first-article runs, or a quality escape investigation to quantify rework exposure before committing labor.
It uses one average labor cost per unit, so mixed complexity — a simple two-finger gripper versus a multi-sensor tool changer — will skew the true per-assembly cost.

Current U.S. benchmarks

Global copper trades at $13,484 per tonne (IMF via FRED, May 2026), up 41.5% in a year, and U.S. industrial electricity averages 8.66 cents per kWh. Both feed electrified-hardware unit economics.

Common questions

How do you calculate EOAT rework cost? Multiply the assemblies flagged by the disassembly-and-rebuild labor per unit and by the share that truly needs rework, then add the test fixture and root-cause setup. For 70 flagged units at $110, 55% needing rework, plus $900 setup, the total is $5,135.
Why apply a 'share needing true rework' factor? Flagging isn't the same as failing. Many EOAT assemblies flagged in inspection pass on retest or need only a minor adjustment. Applying the 55% share means you fund the 4,235 dollars of real teardown labor, not the full flagged population.
What is the rework cost per flagged assembly? Divide the total by the number flagged. Here $5,135 across 70 flagged assemblies is $73.36 each, which is the number to compare against your target rework budget per unit.
What is a good rework rate for gripper builds? Mature EOAT build lines aim for a true-rework share under 20-30% of flagged units; a 55% share like the example signals a process or design issue — often finger alignment fixturing or wiring — worth a root-cause pass.
Should the root-cause setup be a fixed cost? Yes. Building a test fixture and running root-cause analysis is a one-time expense per investigation. In the example it's the $900 fixed adder on top of the $4,235 variable rework labor.

Last reviewed 2026-05-12.