Robotic End-of-Arm Tooling worked example

Custom Bracket Machining Cost at 92% billable spindle-cutting share: a worked example

Push billable spindle-cutting share up to 92% and the picture changes. This example computes every intermediate figure at that operating point. you are quoting or budgeting a one-off machined bracket that adapts a gripper, camera, or tool to a specific robot flange.

The inputs for this scenario

  • Bracket machining hours: 9 hr (unchanged)
  • Machine-plus-operator shop rate: 95 $ / hr (unchanged)
  • Billable spindle-cutting share: 92 % (raised for this scenario; the documented default is 80)
  • Stock, fixturing, and programming cost: 640 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Bracket machining cost = bracket machining hours x machine-plus-operator rate x billable cut-time share + stock, fixturing, and programming) to the inputs above produces each figure below.
  • At this operating point the engine returns 1,427 $ for total custom bracket machining cost, the number this scenario is built around.
  • At this operating point the engine returns 159 $ / piece for custom bracket machining cost per unit.
  • At this operating point the engine returns 787 $ for variable custom bracket machining cost.
  • At this operating point the engine returns 640 $ for fixed custom bracket machining cost adder.

How this compares with the baseline

  • Against the tool's baseline example, where billable spindle-cutting share sits at 80% and the headline result is 1,324 $, this scenario comes in 7.75% above the baseline at 1,427 $.
  • It totals a custom bracket's cost by charging billable cut time at the machine-plus-operator rate and adding a fixed stock, fixturing and programming amount. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Total custom bracket machining cost: 1,427 $ (headline result)
  • Custom bracket machining cost per unit: 159 $ / piece
  • Variable custom bracket machining cost: 787 $
  • Fixed custom bracket machining cost adder: 640 $

Run it with your numbers

  • Every input above is editable in the live Custom Bracket Machining Cost calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.