Foundry & Forging worked example

Shot Blast Capacity at 99% shot-blast machine availability: a worked example

This scenario runs the shot blast capacity calculation on the strong side: 99% shot-blast machine availability, with every other input held at its documented default. Use it when blast cleaning, tumble blast, hanger blast, wheel blast, or air blast capacity must match shakeout, heat treat, or shipment demand.

The inputs for this scenario

  • Parts per blast cycle: 18 parts / cycle (unchanged)
  • Available blast cycles: 55 cycles (unchanged)
  • Shot-blast machine availability: 99 % (raised for this scenario; the documented default is 90)
  • Accepted blasted-part yield: 97 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross shot blast capacity = parts per blast cycle × available blast cycles) to the inputs above produces each figure below.
  • At this operating point the engine returns 951 units for good shot blast capacity, the number this scenario is built around.
  • At this operating point the engine returns 990 units for gross shot blast capacity.
  • At this operating point the engine returns 9.9 units for shot blast capacity downtime loss.
  • At this operating point the engine returns 29.4 units for shot blast capacity reject or rework loss.

How this compares with the baseline

  • Against the tool's baseline example, where shot-blast machine availability sits at 90% and the headline result is 864 units, this scenario comes in 10% above the baseline at 951 units.
  • Use it when balancing the cleaning room against pour schedule, justifying a second blast machine, or quoting a job whose volume depends on blast throughput. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Good shot blast capacity: 951 units (headline result)
  • Gross shot blast capacity: 990 units
  • Shot Blast Capacity downtime loss: 9.9 units
  • Shot Blast Capacity reject or rework loss: 29.4 units

Run it with your numbers

  • Every input above is editable in the live Shot Blast Capacity calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.