DEMO — fictional range. Local brief only, NOT SENT. No personal data is collected or transmitted.
REVISION
A drawing without a revision is a drawing without a history.
Most disputes in a machining programme are about which revision was made. A revision log is not paperwork; it is the thing that makes a delivered part defensible.
- Revision letter
- Every change, however small, gets one
- What changed
- The feature, the value and the reason
- Who asked
- The change came from somewhere, and that is worth recording
- When it took effect
- Which batch was the first made to the new revision
- What it supersedes
- Which revision the new one replaces
- Where it is held
- The controlled copy, and who can issue the next one
| Rev | Change | Reason | First batch |
|---|---|---|---|
| A | Bore tolerance opened from H7 to H8 | The fit did not need H7 | Example · batch 2 |
| B | Clamp screw moved 3 mm from the slit | Clearance for the tool | Example · batch 4 |
| C | Finish changed to satin anodised | Handling marks on bright anodising | Example · batch 5 |
Why "what it supersedes" matters most.
Because a part made to revision B and inspected against revision C is a part that fails inspection while being correct. Recording the supersession is what prevents that.
The habit worth copying.
Recording which batch was the first made to the new revision. Without it, a batch sits between two revisions and nobody can say which drawing it was made to.