Roofing, Siding & Exterior Building Products worked example

Line Speed Capacity at 99% roll-former uptime: a worked example

What does the result look like when roll-former uptime reaches 99%? The full calculation is worked below with real intermediate numbers. Use it when line speed capacity in roofing, siding and exterior building products is being asked to take on more work and you need to know if there is room.

The inputs for this scenario

  • Panels formed per press cycle: 4 units / cycle (unchanged)
  • Available press cycles in the shift: 480 cycles (unchanged)
  • Roll-former uptime: 99 % (raised for this scenario; the documented default is 90)
  • First-pass panel yield: 97 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross line speed capacity = line speed capacity output per cycle × available line speed capacity cycles) to the inputs above produces each figure below.
  • At this operating point the engine returns 1,844 units for good line speed capacity, the number this scenario is built around.
  • At this operating point the engine returns 1,920 units for gross line speed capacity.
  • At this operating point the engine returns 19.2 units for line speed capacity downtime loss.
  • At this operating point the engine returns 57.02 units for line speed capacity yield loss.

How this compares with the baseline

  • Against the tool's baseline example, where roll-former uptime sits at 90% and the headline result is 1,676 units, this scenario comes in 10% above the baseline at 1,844 units.
  • A figure at this level is achievable when roll-former uptime is genuinely sustained, not just peaked for a shift. It uses a single blended uptime and yield figure; it will not capture a specific jam-prone profile or a warm-up scrap spike unless you feed it representative averages.

Results at a glance

  • Good line speed capacity: 1,844 units (headline result)
  • Gross line speed capacity: 1,920 units
  • Line speed capacity downtime loss: 19.2 units
  • Line speed capacity yield loss: 57.02 units

Run it with your numbers

  • Every input above is editable in the live Line Speed Capacity calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.