Robotic End-of-Arm Tooling worked example

Jaw Wear Reserve at 61% abrasive-duty derate: a worked example

This worked example runs the jaw wear reserve numbers for a tougher week than the baseline: 61% abrasive-duty derate instead of the typical 85%. Build a wear reserve for replaceable gripper jaws and contact pads from cycle count, wear rate, and duty severity.

The inputs for this scenario

  • Gripper cycles in service: 500 cycles (000s) (held at the documented default)
  • Jaw wear cost per thousand cycles: 1.8 $ / 1000 cycles (held at the documented default)
  • Abrasive-duty derate: 61 % (the input this scenario stresses; the baseline uses 85)
  • Changeover and alignment labor: 120 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Jaw wear reserve = gripper cycles x jaw wear cost per thousand cycles x abrasive-duty derate + changeover and alignment labor.
  • Total jaw wear reserve cost works out to 669 $ at these inputs, and this is the headline figure for the scenario.
  • Jaw wear reserve cost per unit works out to 1.34 $ / piece at these inputs.
  • Variable jaw wear reserve cost works out to 549 $ at these inputs.
  • Fixed jaw wear reserve adder works out to 120 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where abrasive-duty derate sits at 85% and the headline result is 885 $, this scenario comes in 24.41% below the baseline at 669 $.
  • Use it when budgeting preventive maintenance for a gripper program, quoting a long production run, or comparing jaw materials by their wear cost. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Total jaw wear reserve cost: 669 $ (headline result)
  • Jaw wear reserve cost per unit: 1.34 $ / piece
  • Variable jaw wear reserve cost: 549 $
  • Fixed jaw wear reserve adder: 120 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Jaw Wear Reserve calculator, set abrasive-duty derate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.