In this guide 6 sections
Give each part one master drawing, one named owner and one live revision, so that every machinist, grinder and inspector reads the same issue. Release a new revision with a change note, replace old copies on the floor and at inspection on the same day, and mark the earlier issue obsolete. Software enforces this. Nobody works from a stale print.
Name one master and one owner
Every drawing needs one master file in one place, and a PDF on a machinist’s phone, a shared drive or a printed traveller is only a view of it. A copy is never the master.
Assign an owner to each part family, such as needle holders, scissors or forceps, and keep that list short enough to read at a glance. The owner decides who signs. Without a named owner, revisions get released by whoever sits nearest the CAD workstation on a busy afternoon, and that is how errors reach the grinding bay.
Write the change before drawing it
A revision starts as a change request that states what changes, why, which parts it touches and what happens to the bar stock and blanks already cut. A tip radius edit on a needle holder jaw looks small on paper, yet it is large for every part in process.
Record the stock decision explicitly. Scrap, rework and use as is each need a signed entry, because vague notes are how two revisions end up inside one batch of scissors. Customers then receive instruments that look identical and measure differently, and the complaint reaches the quality desk months after the batch has left the packing bench.
- Part number and old revision letter
- New revision letter and reason for change
- Affected work orders and stock on hand
- Decision for parts already made
- Approver names and dates
Release in one move
Release means three things happening together: the new drawing is published, the old one is marked obsolete, and the inspection plan updates to match. One lag splits the shop in two.
A document control system helps most here, because paper depends on one clerk remembering to walk round every bench with replacement prints. Released revisions should overwrite the earlier issue on every terminal and traveller in the same moment, while paper prints on the floor are collected against a signed log.
Do it before the next shift starts. A night operator who finds an old print at the grinding station will trust it, because nothing on the paper says a newer issue has replaced it.
Keep the inspector on the same issue
The inspection sheet must name the revision it checks, since dimensions, tolerances, thread callouts and surface finish values all come from the drawing’s notes. Move the drawing to revision C while the sheet still quotes B, and good parts get rejected while bad ones slip through the final gauge.
Link the sheet to the drawing record so any revision change flags it for review, and require a first-article check on the new revision before regular production resumes. Gauges may need replacing too.
- Sheet shows drawing number and revision
- First article required after each release
- Gauges listed match the new tolerances
- Old sheets locked against new work orders
Retire old revisions without losing them
Obsolete does not mean deleted. Years later, a regulator or a hospital may ask which revision a returned instrument was built to, so keep every issue read-only with its release date. Record the serial range beside it.
Review the list each quarter. Walk the floor with that printout and check the revision letter on every traveller at the grinding, polishing and passivation stations against the master. Look for open work orders that still point at a retired revision, a slip that takes under an hour to find once the data sits in one place. It catches most slips early.
Revision release checklist
This checklist has four blocks, covering request, approval, release and retirement, and each block carries a signature line and a date for the named part owner. Request holds the part, reason and stock decision. Approval holds names and dates. Release lists the floor copies replaced, the inspection sheet updated and the first article passed, while retirement holds the serial range covered and the lock date.
Open a blank worksheet to printQuestions owners ask
Who should approve a drawing change?
The part owner signs first, and quality and production add their signatures whenever the change touches inspection limits, gauges or process steps. Each approval stays under its own name.
Can we keep drawings in a shared folder?
Only for a very small shop. Beyond that, a folder cannot stop a stale copy from being opened, printed and carried to a machine by someone who never saw the change notice.
What happens to stock made on the old revision?
The change record says whether stock already cut is scrapped, reworked or used as is, and that decision is signed and attached to every affected work order.