Tooling, Fixtures, Dies & Mold Economics worked example

Preventive Tooling Maintenance at 99% expected tooling uptime between pms: a worked example

What does the result look like when expected tooling uptime between pms reaches 99%? The full calculation is worked below with real intermediate numbers. Use it when preventive tooling maintenance in tooling, fixtures, dies and mold economics is being asked to take on more work and you need to know if there is room.

The inputs for this scenario

  • Parts produced per maintenance cycle: 4 units / cycle (unchanged)
  • Maintenance cycles available in the period: 480 cycles (unchanged)
  • Expected tooling uptime between PMs: 99 % (raised for this scenario; the documented default is 90)
  • Expected first-pass yield after PM: 97 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross preventive tooling maintenance capacity = preventive tooling maintenance output per cycle × available preventive tooling maintenance cycles) to the inputs above produces each figure below.
  • At this operating point the engine returns 1,844 units for good preventive tooling maintenance capacity, the number this scenario is built around.
  • At this operating point the engine returns 1,920 units for gross preventive tooling maintenance capacity.
  • At this operating point the engine returns 19.2 units for preventive tooling maintenance downtime loss.
  • At this operating point the engine returns 57.02 units for preventive tooling maintenance yield loss.

How this compares with the baseline

  • Against the tool's baseline example, where expected tooling uptime between pms sits at 90% and the headline result is 1,676 units, this scenario comes in 10% above the baseline at 1,844 units.
  • A figure at this level is achievable when expected tooling uptime between pms is genuinely sustained, not just peaked for a shift. Uptime and yield are entered as flat expected percentages, so it assumes the tool holds those rates across the whole period; a tool degrading toward end-of-life between PMs will underperform the estimate.

Results at a glance

  • Good preventive tooling maintenance capacity: 1,844 units (headline result)
  • Gross preventive tooling maintenance capacity: 1,920 units
  • Preventive tooling maintenance downtime loss: 19.2 units
  • Preventive tooling maintenance yield loss: 57.02 units

Run it with your numbers

  • Every input above is editable in the live Preventive Tooling Maintenance calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.