Sheet Metal Stamping & Press Lines worked example

Press Strokes Per Minute at 65% press line uptime efficiency: a worked example

This worked example runs the press strokes per minute numbers for a tougher week than the baseline: 65% press line uptime efficiency instead of the typical 90%. Press strokes per minute (SPM) is the heartbeat of any stamping line — it tells you how many hits the press actually delivers in a given window once you account for downtime, misfeeds and jams.

The inputs for this scenario

  • Total parts stamped during the run: 1,200 units (held at the documented default)
  • Press running time (spindle-on): 8 hr (held at the documented default)
  • Press line uptime efficiency: 65 % (the input this scenario stresses; the baseline uses 90)

Working through the calculation

  • The calculation starts from the formula this tool documents: Raw press strokes per minute = completed output ÷ runtime.
  • Effective throughput works out to 97.5 units at these inputs, and this is the headline figure for the scenario.
  • Raw throughput works out to 150 units at these inputs.
  • Efficiency works out to 65 % at these inputs.
  • Runtime works out to 8 hr at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where press line uptime efficiency sits at 90% and the headline result is 135 units, this scenario comes in 27.78% below the baseline at 97.5 units.
  • Use it after a production run to validate quoted cycle time, when comparing a die's actual output to its rated SPM, or when balancing work across multiple presses. 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

  • Effective throughput: 97.5 units (headline result)
  • Raw throughput: 150 units
  • Efficiency: 65 %
  • Runtime: 8 hr

Run it with your numbers

  • To rerun this with your own numbers, open the live Press Strokes Per Minute calculator, set press line uptime efficiency to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.