EOAT Cost

EOAT Cost Estimation: What Drives Cost Per Pick

How cost per pick actually adds up on an EOAT program, and how to quote material, labor, air, consumables, and downtime without understating ownership cost.

Cost per pick on an EOAT program comes from four buckets: amortized tooling capital, cycle-linked operating cost, maintenance consumables, and downtime. A custom two-cup vacuum tool might carry $4,200 in build cost. Spread across a 2 million part program that is $0.0021 per part in capital alone. Get the volume assumption wrong by 30% and every downstream number moves with it. Before quoting, separate one-time engineering and build from the recurring per-part cost, because buyers challenge blended rates that hide which lever actually moves the price.

Bracket and adapter plate material is the visible cost. A 6061-T6 aluminum plate at $7 to $9 per kg turns a 1.8 kg blank into $13 to $16 of raw stock, but the Custom Bracket Machining Cost calculator shows machining dwarfs it. At a shop rate of $85 to $120 per hour, a bracket needing 40 minutes of milling adds $57 to $80. Roughing, a flip, and a finish pass on a mounting interface easily hit that. Design for fewer setups: cutting a second operation saves one fixture change and 10 to 15 minutes, often $20 per bracket.

EOAT Assembly Labor is where quotes drift. A technician loaded at $50 to $70 per hour assembles fittings, tubing, sensors, and cable management. A modest two-gripper tool with a valve manifold and eight pneumatic connections runs 3 to 5 build hours, so $150 to $350 of labor. Add integration and I/O checkout and it climbs. The EOAT Assembly Labor calculator forces you to count connection points rather than guess a round number, because the common miss is pricing the mechanical build and forgetting the 1 to 2 hours of pneumatic leak-down and signal verification.

Compressed air is a real recurring cost that estimators skip. Generating compressed air costs roughly $0.018 to $0.03 per cubic meter of free air, depending on power price and compressor efficiency. A gripper pulling 1.33 m³/hr runs about $0.03 per hour, trivial alone, but a 24-cup end effector cycling continuously across three shifts can add $600 to $1,200 per year per tool. Vacuum leaks make it worse, since a cup that loses seal wastes air continuously. Quote air as an annual line so the buyer sees the operating tail, not just the purchase price.

Consumables set the maintenance budget. The Jaw Wear Reserve calculator ties jaw or fingertip life to cycles: hardened jaws might survive 2 million cycles, urethane vacuum cups 500,000 to 1 million before the seal degrades. If replacement cups cost $18 each and a tool runs eight of them, a rebuild is $144 in parts plus 45 minutes labor, call it $190. On a tool doing 1 million cycles per quarter, that is roughly $760 per year in cup consumables. Estimators who quote only the build price and ignore this understate two-year cost of ownership by 15% to 25%.

Downtime is the most expensive and least quoted cost. The Tool Changeover Time calculator values every minute the line is stopped. If a cell produces 2,700 parts per hour at a $0.40 contribution margin, an hour of changeover or unplanned tool swap costs $1,080 in lost margin. A manual tool change at 20 minutes versus a quick-change coupler at 90 seconds saves 18.5 minutes, worth about $333 per swap. Across daily product changes that pays back a $2,500 coupler in roughly eight days. Price avoided downtime into the tool, not just the hardware.

Estimates fail on three assumptions: volume, first-pass yield, and compatibility rework. The Robot Compatibility Risk calculator flags flange, payload, and I/O mismatches that force a redesign after build, and a single re-machine plus reassembly can erase a 20% margin. Build the quote bottom up: material, machine time, assembly hours, checkout, plus a named contingency of 8% to 12% for integration surprises. Show the buyer the per-part cost at their real volume, not a best case. A quote that separates capital, consumables, air, and downtime survives scrutiny and protects margin when the program scales.

Published 2026-07-02.