Tool Sharpening, Reconditioning & Industrial Repair Services worked example

Sharpening Cycle Time at 7.2% setup and handling allowance: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop setup and handling allowance to 7.2%, then walk the calculation through step by step. Sharpening Cycle Time tells a tool room how many hours a batch of drills, end mills or inserts will actually tie up a CNC grinder once handling and setup are folded in.

The inputs for this scenario

  • Tools in the sharpening batch: 120 units (held at the documented default)
  • Tools sharpened per hour on the grinder: 12 units / hr (held at the documented default)
  • Setup and handling allowance: 7.2 % (the input this scenario stresses; the baseline uses 10)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base sharpening cycle time time = required work รท processing rate.
  • Adjusted run time works out to 10.72 hr at these inputs, and this is the headline figure for the scenario.
  • Base run time works out to 10 hr at these inputs.
  • Allowance applied works out to 7.2 % at these inputs.
  • Process rate works out to 12 pieces / min at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where setup and handling allowance sits at 10% and the headline result is 11 hr, this scenario comes in 2.55% below the baseline at 10.72 hr.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to setup and handling allowance, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It assumes one steady processing rate across the whole batch; mixed tool geometries that grind at very different speeds need to be split into separate runs.

Results at a glance

  • Adjusted run time: 10.72 hr (headline result)
  • Base run time: 10 hr
  • Allowance applied: 7.2 %
  • Process rate: 12 pieces / min

Run it with your numbers

  • To rerun this with your own numbers, open the live Sharpening Cycle Time calculator, set setup and handling allowance to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.