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Drawing Numbering Standards
I've been using different variations of drawing number standards, depending on what company I'm designing for. Often folks will add a suffix to part numbers, e.g. 12345-01. The -01 can be the primary part, and the other variations of the same basic part can be -02, -03, etc. An example would be a molded case part that gets painted. -01 is the gray one, -02 is blue, -03 is pearl white, etc. One drawing can capture all these in tabular form (call it a "Tab Drawing" for short). In one company I worked for the drawing would be the -00, so it was obviously a drawing and not a physical part when listed in an assembly BOM. Yes, BOMs should include necessary documents, not just the physical parts.
Does anyone else have a version that is different than this one?
Brian Halicki
Replies to This Discussion
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Permalink Reply by Richard Crane on -
Brian,
The only thing you can say about drawing numbers (and hence part numbers derived from them) is that every company has a different method. This is actually a good thing in these days of massive on-line databases containing the products of the world. If there was too much commonality, it would be a nightmare.
The important thing about any drawing system is that it facilitates configuration control throughout the product tree, from the smallest part to the highest assembly, which could be a particular model of say, a 747 airliner or the empire state building.
In some industries, there are particular rules that have to be met. For instance, in the european aerospace industry there is a requirement to mark each part with the unique part number and also to identify the manufacturer. Many aerospace companies, therefore include an element of their company identity within the part number, usually by 1 to 3 letters. The unique section of the part-number would be derived from a master drawing list controlled by the design office. Dash numbers are normally used to indicate different variants of a part, sub-assembly or assembly, as you mentioned.
Whatever method is used, it should be fully explained in the documented procedures of the design office.
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