Tube, Pipe & Profile Forming calculator
Fixture Capacity Calculator
Check whether your forming fixture can supply the required accepted tubes. Enter its full cycle, occupied nests, available running minutes and observed first-pass results.
What this calculator does
- Forecast accepted formed tubes from a timed fixture cycle and observed first-pass yield.
Formula used
- Complete cycles = floor(available minutes × 60 ÷ full cycle seconds)
- Gross capacity = complete cycles × occupied nests
- Expected accepted output = gross capacity × observed first-pass good ÷ observed total
- Expected rejects = gross capacity − expected accepted output
- Capacity gap = expected accepted output − required output
Inputs explained
- Occupied Fixture Nests: Tubes loaded in occupied fixture nests each complete cycle.
- Full Fixture Cycle: Timed loading, clamping, forming, release and unloading cycle.
- Available Fixture Running Time: Reserved minutes after setup, breaks and anticipated stops.
- Observed Formed Tubes: First-pass formed count from a comparable production run.
- Observed First-Pass Accepted Tubes: Tubes accepted without rework in that same observed run.
- Required Accepted Tubes: Accepted tube quantity needed from this available window.
How to use the result
- Best suited to fixture shift Planning, additional fixture evaluation.
- A changed tube geometry, nest loading or rejection pattern needs new observations.
Current U.S. benchmarks
- The producer price index for steel mill products stands at 381.162 (BLS, Aug 2026), up 23.4% from a year earlier. Quotes priced off last quarter's material cost miss this move.
Common questions
- Does cycle time include loading and unclamping? Yes. Use a full repeated fixture cycle, including loading, clamping, forming, release and unloading.
- Should available minutes include a tool change? No. Deduct setup, breaks and anticipated stops before entering available running minutes.
- What if some fixture nests are empty? Enter only the nests normally occupied each cycle. A changing nest count needs separate estimates for each loading pattern.
- Why can expected accepted tubes be fractional? Observed yield is an average applied to complete fixture cycles. The forecast is an expectation; it does not guarantee an integer shipment quantity.
Last reviewed 2026-10-06.