Metals, Steel, Aluminum & Coil Processing worked example

Roll Forming Speed at 65% line efficiency: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop line efficiency to 65%, then walk the calculation through step by step. Set roll forming line speed from the required piece output, the cut length per piece, and a realistic line efficiency, so the first setup lands close.

The inputs for this scenario

  • Required finished pieces per hour: 400 pieces / hr (held at the documented default)
  • Cut length per piece: 18 in (held at the documented default)
  • Line efficiency: 65 % (the input this scenario stresses; the baseline uses 90)

Working through the calculation

  • The calculation starts from the formula this tool documents: Required piece rate = required piece output ÷ line efficiency.
  • Required line speed works out to 15.38 ft/min at these inputs, and this is the headline figure for the scenario.
  • Required piece rate works out to 615 pieces / hr at these inputs.
  • Cut length per piece works out to 18 in at these inputs.
  • Line efficiency works out to 65 % at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where line efficiency sits at 90% and the headline result is 11.11 ft/min, this scenario comes in 38.46% above the baseline at 15.38 ft/min.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to line efficiency, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It assumes steady-state running and treats efficiency as a single blended factor — it doesn't model acceleration, flying-cut dwell, accumulator behavior, or speed limits set by tooling and material thickness.

Results at a glance

  • Required line speed: 15.38 ft/min (headline result)
  • Required piece rate: 615 pieces / hr
  • Cut length per piece: 18 in
  • Line efficiency: 65 %

Run it with your numbers

  • To rerun this with your own numbers, open the live Roll Forming Speed calculator, set line efficiency to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.