DEMO — fictional range. Local brief only, NOT SENT. No personal data is collected or transmitted.
REVISION
A revision to a contact is a revision to a tool.
Board connectors are terminated with tooling set to a dimension. A drawing change that is not passed to the tool produces a part that was never made to the drawing.
- Revision letter
- Every change, however small, gets one
- What changed
- The feature, the value and the reason
- Tooling impact
- Whether the press die or the mould has to change
- Interchangeability
- Whether the new revision mates with the old one
- When it took effect
- Which batch was the first made to the new revision
- What it supersedes
- Which revision the new one replaces
| Rev | Change | Reason | Impact |
|---|---|---|---|
| A | Pin length reduced 0.3 mm | Pin bottomed in the socket | New header mould |
| B | Plating raised to 0.8 µm gold | Worn through at 200 cycles | None |
| C | Press depth reduced 0.1 mm | Conductor cut at the deep setting | New die |
Why interchangeability is a separate column.
Because a revision can keep the footprint and change the contact. Two revisions then mate mechanically and differ electrically, and a board built from both is neither revision.
The habit worth copying.
Recording the tool setting with the revision. Without it, the drawing describes a termination nobody can reproduce.