NPI, DFM/DFA & Engineering Change worked example

DFA Assembly Time at 7.2% setup, handling & delay allowance: a worked example

Suppose setup, handling & delay allowance falls to 7.2%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate dfa assembly time for npi, dfm/dfa and engineering change using production-ready inputs so teams can plan labor hours, schedule the work, or check whether the job fits the available shift time.

The inputs for this scenario

  • Units to Assemble: 120 units (held at the documented default)
  • Assembly Completion Rate: 12 units / min (held at the documented default)
  • Setup, Handling & Delay 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 dfa assembly time = dfa assembly time workload รท dfa assembly time completion rate.
  • Required dfa assembly time works out to 10.72 hr at these inputs, and this is the headline figure for the scenario.
  • Base dfa assembly time works out to 10 hr at these inputs.
  • Dfa assembly time allowance applied works out to 7.2 % at these inputs.
  • Dfa assembly time completion rate works out to 12 pieces / min at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where setup, handling & delay allowance sits at 10% and the headline result is 11 hr, this scenario comes in 2.55% below the baseline at 10.72 hr.
  • It converts a batch quantity and a per-minute assembly rate into required hours, then scales that base time up by a setup-and-handling allowance. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Required dfa assembly time: 10.72 hr (headline result)
  • Base dfa assembly time: 10 hr
  • Dfa assembly time allowance applied: 7.2 %
  • Dfa assembly time completion rate: 12 pieces / min

Run it with your numbers

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

Last reviewed 2026-05-12.