Definition
A revision is a tracked, identified version of a part's drawing or CAD model, typically marked with a letter or number and a date, recording what changed from the prior version. A quote, routing or process plan is only valid for the specific revision it was created against.
Why revision tracking matters for pricing
A quote or routing created for one revision can become invalid the moment a new revision changes a tolerance, feature or material, which is why tracking exactly which revision a price or plan applies to matters as much as the price itself.
Where it appears on the drawing
In the title block, as a revision letter or number, usually alongside a revision history table listing what changed and when.
Common mistakes
Reusing an old quote or routing for a new revision without checking what changed; a small revision (a tightened tolerance, a moved datum) can silently invalidate an existing process plan or price.
A quote or routing created for one revision can become invalid the moment a new revision changes a tolerance, feature or material, which is why tracking exactly which revision a price or plan applies to matters as much as the price itself.
See how Blake reviews a partFrequently asked questions
Does every drawing change create a new revision?
In a controlled environment, yes, any change to the released drawing or model should be tracked as a new revision.
Can a quote apply to any revision of a part?
No, a quote is normally valid only for the specific revision it was calculated against.
Where do I find what changed between revisions?
Usually in a revision history table in the drawing's title block, or in the PLM system's change record.