In this guide 6 sections
Stop the job at the next stage, then trace the change through nested sheets, cut parts, bent parts and the printed floor copy. Decide per batch whether to rework, scrap or use as is, replace every old copy with the new revision and record who approved the call.
Freeze the job and find out how far it went
The first task is to stop value being added to the wrong part, so tell the laser, press brake and weld bay crews that this job is on hold. A whiteboard message is not enough.
Then count the nested sheets, the cut parts and the parts already bent, welded or coated, which a planner with the traveller can do in minutes.
Write the numbers on the job. They decide everything that follows.
Read what actually changed
Compare the old and new drawing line by line, because a moved hole, a thicker gauge, a new flange height and a different finish call-out each hurt differently. A new grade makes cut parts scrap.
Ask whether the change is mandatory or a preference, since some revisions only fix a note while others alter the fit with a mating part. Fit changes demand the new print.
Get the change in writing. Include the revision letter and date before you act on anything, because a verbal instruction is hard to defend once scrap is on the floor.
- Features moved, added or removed
- Material, thickness or finish changes
- Bend angles, flange lengths and tolerances
- Quote and delivery date impact
Decide per batch: rework, scrap or accept
Sort the work into three piles. Parts needing an extra hole or a trimmed flange go to rework, parts with the wrong thickness go to scrap, and parts that meet the new print carry on.
Cost each pile, because rework hours, scrap sheet and delay belong on a change note the customer sees, or else the shop absorbs the loss silently.
The project engineer and the customer sign a short approval that closes the call and records which pile each part joined on the day.
Replace every old copy
Old printouts are the real danger, so collect the floor copy, the laser program, the bend program and the weld fixture drawing and replace each with the new revision. Destroy the old paper.
Check the nesting, because if the part outline changed, regenerate the nest and move the old DXF to an archive folder where nobody can reopen it by mistake.
Keep a revision register on the job, listing the letter, date, approver and what it replaced, which takes five minutes per change and saves hours later.
- Floor copy and traveller reprinted
- Nest and machine program regenerated
- Old DXF and PDF archived
- Inspection sheet set to new tolerances
Make revision control the default
Shared folders invite a repeat. Revision control means one place for the current drawing, a visible letter on every traveller and a flag for the planner when a new revision arrives.
Software can link the drawing to the job and warn the planner about sheets already nested, though even a strict folder naming rule helps as a first step.
Pick your last late change. Write down where the old drawing was still in use, because that list becomes your control plan and shows which handoff to fix first.
Late drawing change log
Single-page log headed by job number, old and new revision, and approver, with a table beneath that lists each stage: nested, cut, bent, welded and coated. Columns show quantity affected, the decision of rework, scrap or accept, hours lost and sheets wasted, so the cost of the change is visible on one page.
Open a blank worksheet to printQuestions owners ask
Who pays for parts cut to the old drawing?
That depends on the contract and on who issued the change, so record the cost on a change note and send it to the customer with the revision. Settle it before the new work ships.
How can I stop operators using old printouts?
Print the revision letter large on the traveller, remove old copies at each change and keep drawings off personal folders, and have operators check the letter before starting.
Do small changes need a full log entry?
Yes, a short one. Even a note change gets a letter, a date and an approver, because small changes are the ones people forget and the ones that come back as scrap.