Foundry & Forging worked example

Mold Cycle Time at 8.64% molding allowance: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop molding allowance to 8.64%, then walk the calculation through step by step. Estimate time needed to make, close, pour-ready, cool, or cycle molds through a molding line.

The inputs for this scenario

  • Molds required: 180 molds (held at the documented default)
  • Mold completion rate: 28 molds / hr (held at the documented default)
  • Molding allowance: 8.64 % (the input this scenario stresses; the baseline uses 12)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base mold cycle time = molds required รท mold completion rate.
  • Required mold cycle time works out to 6.98 hr at these inputs, and this is the headline figure for the scenario.
  • Base mold cycle time works out to 6.43 hr at these inputs.
  • Molding allowance works out to 8.64 % at these inputs.
  • Mold completion rate works out to 28 pieces / min at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where molding allowance sits at 12% and the headline result is 7.2 hr, this scenario comes in 3% below the baseline at 6.98 hr.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to molding allowance, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It treats the completion rate as steady, but real molding lines slow for sand changes, pattern swaps, and ramp-up, so a single average rate can hide variation within the run.

Results at a glance

  • Required mold cycle time: 6.98 hr (headline result)
  • Base mold cycle time: 6.43 hr
  • Molding allowance: 8.64 %
  • Mold completion rate: 28 pieces / min

Run it with your numbers

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

Last reviewed 2026-05-12.