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.
On a part made in thousands, a revision change has to be traceable to a batch, because batches made before and after it will be in the same stores.
- 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
- Stores
- Whether old and new stock may be mixed
| Rev | Change | Reason | First batch |
|---|---|---|---|
| A | Thread class loosened to suit plating | Plated parts would not start | Example · batch 6 |
| B | Counterbore depth tolerance halved | Effective thread length varied | Example · batch 9 |
| C | Slot milled rather than punched | Edge cracking on thick plate | Example · batch 11 |
Why the stores question belongs on the log.
Because a revision that takes effect mid-stores leaves two versions on the shelf. If the drawing does not say whether they may be mixed, somebody will mix them, and the failure appears in the assembly rather than in the paperwork.
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.