In this guide 6 sections
Fabrication jobs overrun when the quote assumes sheet weight, cutting minutes and bending setups that the shop floor never records against the job. Compare each quoted line with what the job consumed, book usable offcuts back to stock and charge every rework hour to the job that caused it.
Start with the quote, line by line
Pull the last ten closed jobs and lay each quote beside its actuals on one sheet, so that no job hides behind a different layout. Use the same lines for both: sheet weight, laser or punch time, bending setups, welding hours, powder coating and packing. Differences show up quickly. Note each one.
Most shops find the gap sits in two or three lines, and one customer, one material grade or one part family usually carries the loss. Find it.
A quote written from a nesting estimate assumes a perfect layout, with every part packed tight and no sheet lost to clamps, defects or a bad first cut. The real sheet was cut on another day, by another operator, beside a remnant that nobody wrote down, after the cutting program was edited twice at the machine. Reality is messier.
- Sheet weight issued against sheet weight quoted
- Laser or punch minutes from the machine log
- Bending setups and press brake changeovers
- Welding and fitting hours
- Powder coating batch charge per part
Sheet use is where the money hides
A quote counts the weight of the finished parts plus a nesting allowance, usually a flat figure nobody has checked against real skeleton weights. The shop buys full sheets. Whatever the nest does not use becomes skeleton scrap for the yard or an offcut leaning on the rack, and the shop has paid for it either way. Both cost money.
Ask what happens to a 600 by 400 remnant of 2 mm mild steel after the job. If nobody books it back, it vanishes from the books, and the next job pays for a full sheet again.
Record each nest with the sheet size, grade and thickness, then the parts cut and the remnant left, using a tag number that matches the label on the rack. Three numbers per sheet are enough. Weigh one skeleton a week. Keep it light.
- Sheet size, grade and thickness issued
- Nest yield from the cutting program
- Remnant dimensions and rack location
- Skeleton scrap weight sent to the yard
Book offcuts back into stock
An offcut is stock with a smaller size. Give it a tag, a grade, a thickness and a rack position, then show it as available when the next quote is built.
Estimators who see remnants cost them at the material rate, not the full sheet rate, so a small bracket job is priced for the offcut it will actually use. Small jobs often nest cleanly on a remnant, which lowers the quote and wins work you would have priced out.
Be strict about the tag. No tag, no reuse. Check the rack monthly. An offcut with no heat number or grade cannot join a job that needs mill certificates, because the inspector will ask for a matching heat number.
Charge rework to the job that caused it
Rework hides in the next job’s hours. A bracket cut with the wrong hole pitch is re-cut on a Thursday, and the operator books the time to whatever is on the screen.
Give rework its own code with a reason: wrong drawing revision, bend angle out of tolerance, coating peel, weld distortion. Each reason points at a different fix, a different person and a different step, so counting them soon shows where the loss sits.
Count the reasons and patterns appear. Act on the top two. A single press brake tool may cause most bend rejections, and one drawing revision may repeat across three jobs for the same customer.
- Wrong drawing revision issued to the floor
- Bend angle or flange length out of tolerance
- Coating thickness or finish rejected
- Weld distortion needing straightening
- Customer return or site fit-up fault
What a custom build should show you
The aim is one job record that holds the quote, the sheets issued, the machine minutes, the offcuts returned and the rework codes. The estimator then sees actuals, not hopes, when pricing the next job for the same customer or the same part family.
Start small. Keep the quote lines as columns in a sheet this week, add the actuals after each job closes and read the gap on Friday. Build software only for the lines that keep drifting.
Job costing gap sheet
A worksheet on a single page, one closed job per line. Each line holds quoted and actual figures for sheet weight, laser or punch minutes, bending setups, welding hours and coating charge. Further columns take offcut weight returned to stock, rework hours with a reason code and the final gap. Totals at the foot show which line drifts most.
Open a blank worksheet to printQuestions owners ask
How many jobs should I review first?
Ten recent closed jobs is enough to see a pattern. Pick a mix of repeat parts and one-off work so the gap is not hidden by a single easy customer.
Do offcuts really matter on small jobs?
Yes. Small jobs nest well on remnants, so a tagged offcut rack lowers material cost on exactly the work where a full sheet is hardest to justify.
Who should enter rework hours?
The operator at the machine or bench, with a supervisor confirming the reason code before the shift ends. Entering it at the moment of the fix keeps the hours from landing on whichever job happens to be open on the screen.
Is a spreadsheet enough to start?
For the first month, yes. Software becomes worth building when entry is slow, offcuts get lost or several people need the same job record at once.