Motors, Generators & Electrification Equipment worked example

Rotor Balancing Time at 12% setup, trial-weight, and recheck-spin allowance: a worked example

This scenario runs the rotor balancing time calculation on the strong side: 12% setup, trial-weight, and recheck-spin allowance, with every other input held at its documented default. Use it when a rotor balancing job needs a defensible run time before a quote or schedule slot goes out.

The inputs for this scenario

  • Rotors to balance this run: 120 rotors (unchanged)
  • Balancing throughput per balancing machine: 12 rotors / min (unchanged)
  • Setup, trial-weight, and recheck-spin allowance: 12 % (raised for this scenario; the documented default is 10)

Working through the calculation

  • Applying the documented formula (Base rotor balancing time = rotors to balance รท balancing rate per machine) to the inputs above produces each figure below.
  • At this operating point the engine returns 11.2 hr for required rotor balancing time, the number this scenario is built around.
  • At this operating point the engine returns 10 hr for base rotor balancing time.
  • At this operating point the engine returns 12 % for setup and recheck allowance applied.
  • At this operating point the engine returns 12 pieces / min for balancing rate per machine.

How this compares with the baseline

  • Against the tool's baseline example, where setup, trial-weight, and recheck-spin allowance sits at 10% and the headline result is 11 hr, this scenario comes in 1.82% above the baseline at 11.2 hr.
  • Use it when scheduling the balancing cell, quoting a job, or checking that balanced rotors will be ready before the motor assembly line needs them. 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

  • Required rotor balancing time: 11.2 hr (headline result)
  • Base rotor balancing time: 10 hr
  • Setup and recheck allowance applied: 12 %
  • Balancing rate per machine: 12 pieces / min

Run it with your numbers

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

Last reviewed 2026-05-12.