Die Output

Getting Full Output from Progressive Dies, Shift After Shift

Progressive die output is SPM times parts out times uptime times quality, and every factor is manageable. Here is the math, the benchmarks, and the routine that keeps parts per hour honest.

A progressive die is a parts per hour machine, and the money math is unforgiving. Output equals SPM times 60 times parts out per stroke times uptime times first pass quality. A 2 out die at 35 SPM with 78 percent uptime and 99 percent quality delivers 35 times 60 times 2 times 0.78 times 0.99, about 3,243 parts per hour, against a theoretical 4,200. That missing 957 parts per hour, at even 4 cents contribution each, is $38 an hour, roughly $150,000 a year on two shifts. Four factors, four levers, and every one of them has an owner.

Measure the four factors separately, because a single parts per hour number hides which one broke. Count strokes at the press control, good parts at the exit conveyor or by weigh count at pack out, and downtime by reason code. Worked shift: 450 scheduled minutes, 322 running, 11,270 strokes, 22,540 parts made, 270 rejected. Uptime 71.6 percent, run speed 35 SPM, quality 98.8, output 22,270 good parts or 2,969 per scheduled hour. The Progressive Die Output calculator assembles the factors into the rate; the shift log tells you whether to call the setter, the die room, or quality.

Benchmark by die type. Small terminals and clips on high speed presses: 400 to 1,200 SPM, often 4 to 16 out. Typical brackets and channels: 25 to 45 SPM, 1 or 2 out. Heavy structural progressions: 12 to 22 SPM. Uptime on progressive lines runs 55 to 65 percent for average shops, 75 to 85 for strong ones. First pass quality should hold above 99 percent; slug pulling and burr drift are the usual thieves. Multiply your factors and compare to theoretical: below 65 percent overall is a project, below 50 is a crisis wearing a routine's clothes.

Uptime is usually the biggest lever. Instrument the die: misfeed, short feed, slug detection, stripper position, and end of stock sensors turn crashes into faults. A crash costs 45 minutes plus die repair risk; a sensor fault costs 4 minutes. At 35 SPM and 2 out, every avoided 45 minute event saves 3,150 parts. Fix strip handling next: a powered straightener matched to the material, coil car staging, and a threading table cut coil change from 25 minutes to 12. Six coil changes a shift at 13 minutes saved is 78 minutes, another 5,460 parts per shift.

Parts out per stroke is the capital lever. Converting a proven single out die to 2 out costs 40 to 60 percent more than the original tool but nearly doubles output and cuts press hours per part almost in half; at $250 per press hour and 3 million parts a year, halving 1,430 press hours saves about $178,000 annually. Speed is the cheap lever after that: verify the feed completes in the available window, tune pilot release, and creep speed up 2 SPM at a time over a week while watching burr height and carrier stability. Never buy speed with crashes.

Quality points are output points. At 3,243 parts per hour, letting quality slip from 99 to 96 percent burns 97 parts an hour and usually announces a die going dull. Track burr height every 2 hours against a limit, typically 10 percent of material thickness; schedule sharpening by strokes, not by breakdown, at intervals the die history supports, commonly 300,000 to 800,000 hits between grinds for mild steel. A planned 3 hour sharpening beats an unplanned 3 day repair. Keep a die log: every grind, every crash, every shim, with stroke counts, or the interval math is guesswork.

The failure modes repeat everywhere. Quoting and scheduling from cycling speed times parts out with no uptime factor, which overstates capacity 25 to 40 percent. Running past the sharpening interval because the schedule is tight, then losing the die for a week. Slug pulls treated as operator nuisance until one doubles a hit and cracks a section costing $20,000. Sensors bypassed on night shift to chase rate. And output reported in strokes when a cavity is blocked off, silently shipping half the parts per hit while the board stays green. Count good parts out; nothing else is output.

Cadence: hourly, operators log parts, strokes, and stops over 2 minutes. Daily, the tier board shows output versus standard per die and the top loss in parts. Weekly, Pareto downtime and quality losses, assign one fix, and review dies approaching sharpening stroke counts. Monthly, re-baseline standards, review multi out conversion candidates over 1.5 million annual parts, and audit sensor bypasses. World class looks like overall output above 80 percent of theoretical, unplanned die downtime under 2 percent of scheduled time, sharpening 100 percent planned, and a die log so complete that the next output problem is diagnosed from a desk in ten minutes.

Published 2026-07-02.