CNC Machining worked example

CNC Batch Capacity at 63% expected machine uptime: a worked example

This worked example runs the cnc batch capacity numbers for a tougher week than the baseline: 63% expected machine uptime instead of the typical 88%. Estimate CNC batch capacity from parts per cycle, available cycles, machine uptime, and first-pass yield.

The inputs for this scenario

  • Parts produced per machine cycle: 4 parts / cycle (held at the documented default)
  • Available CNC cycles in the window: 180 cycles (held at the documented default)
  • Expected machine uptime: 63 % (the input this scenario stresses; the baseline uses 88)
  • First-pass yield: 97 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Gross CNC batch capacity = parts per cycle × available CNC cycles.
  • good CNC batch capacity works out to 440 parts at these inputs, and this is the headline figure for the scenario.
  • gross CNC batch capacity works out to 720 parts at these inputs.
  • CNC Batch Capacity loss from downtime works out to 266 parts at these inputs.
  • CNC Batch Capacity loss from scrap or rework works out to 13.61 parts at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where expected machine uptime sits at 88% and the headline result is 615 parts, this scenario comes in 28.41% below the baseline at 440 parts.
  • Use it when planning a production run or quoting a delivery date and you need a realistic good-part count, not an optimistic ceiling. 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

  • good CNC batch capacity: 440 parts (headline result)
  • gross CNC batch capacity: 720 parts
  • CNC Batch Capacity loss from downtime: 266 parts
  • CNC Batch Capacity loss from scrap or rework: 13.61 parts

Run it with your numbers

  • To rerun this with your own numbers, open the live CNC Batch Capacity calculator, set expected machine uptime to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.