Thermal Spray, Hardfacing & Wear Coatings worked example

Grit Blast Prep Time at 12% fatigue and reposition allowance: a worked example

Push fatigue and reposition allowance up to 12% and the picture changes. This example computes every intermediate figure at that operating point. Use it when grit blast prep time in thermal spray, hardfacing and wear coatings is being added to next week's schedule and you need an honest hours estimate.

The inputs for this scenario

  • Total surface area to grit blast: 120 units (unchanged)
  • Blast booth coverage rate: 12 units / hr (unchanged)
  • Fatigue / reposition allowance: 12 % (raised for this scenario; the documented default is 10)

Working through the calculation

  • Applying the documented formula (Base grit blast prep time time = required work รท processing rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 11.2 hr for adjusted run time, the number this scenario is built around.
  • At this operating point the engine returns 10 hr for base run time.
  • At this operating point the engine returns 12 % for allowance applied.
  • At this operating point the engine returns 12 pieces / min for process rate.

How this compares with the baseline

  • Against the tool's baseline example, where fatigue and reposition allowance sits at 10% and the headline result is 11 hr, this scenario comes in 1.82% above the baseline at 11.2 hr.
  • It divides total blast area by your booth coverage rate to get base hours, then inflates that by an allowance for repositioning and fatigue. 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

  • Adjusted run time: 11.2 hr (headline result)
  • Base run time: 10 hr
  • Allowance applied: 12 %
  • Process rate: 12 pieces / min

Run it with your numbers

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

Last reviewed 2026-05-12.