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I'm the designer in the development phase of a design project, now, and have asked Purchasing to help get quotes. But Purchasing and Quality insist that part numbers be assigned, first. My CAD program auto-assigns document numbers and my CAD documents often include many non-interchangeable...

Designs are documents and parts are physical assets. Controlling complex designs is tough enough without trying to manage physical objects. Those responsible for mastering design control are usually not the same people who are responsible to controlling the physical assets. There are exceptions...

nwrichard, Some of the folks who post here are the best of the best when it comes to ASME Y14.5-2009 and have helped shape Y14.5 over the years. They disagree sometimes, but not with respect to this. Take some time and look deeper. They have set me straight on many occasions. Peter Truitt...

Do you have a formal definition of interchangeability? Does each product have a product design specification to use as the basis of making interchangeability decisions? Peter Truitt Minnesota

I get the idea that more companies are getting away from the integration of the part number format into the document number format. For example, in older, best-practice companies, 123456 is the document number and 123456-03 is the part number designation. (Tabulated part-number methodology...

Sorry... This is not a topic of discussion in this forum. Peter Truitt Minnesota

Hmmmmm. Where are the words??? I suppose you realize that the CAD model used for both illustrations is the same except I circumscribed a sphere around the cube as a last step in the illustration on the right side. Someone might be confused by the fact that I rotated the model after adding the...

I am still thinking about cubical vs. spherical tolerance zones. Noone responded the first time I posted it at http://www.eng-tips.com/viewthread.cfm?qid=325577. (I don't blame you guys/gals. I get in over my head all too often.) One of the attached illustrations shows a cube, with a basic...

Sorry, but your question is not related to the issues discussed in this forum. Peter Truitt Minnesota

Without respect to where I presently work, I would say that, if possible, a competent team of people from various areas of responsibility in the company who have had experience at various capable companies should lead. But younger folks or folks with less experience must be fully engaged to keep...

Consider the OP "...change the revision of a part...". Most documentation experts say that documents have revisions and parts do not. The distinction is very, very important. But even experts goof up the teminology sometimes. For instance, Frank Watts goofed up on page 30 of his "Engineering...

Bottom line: Just be consistent. Have a policy and follow it. But I don't like the idea, frankly. Neither would Frank. (Frank Watts, that is...) Form, fit, & function are PART number issues, not DOCUMENT revision designation issues in my 'book' and actual Book books. Peter Truitt Minnesota

Bottom line: Just be consistent. Have a policy and follow it. My slight preference is to revise it as you would with respect to any interchangable change if you must change it. But resist making such changes at all. Changes are dangerous and cost money... Peter Truitt Minnesota

I often design custom checking fixtures instead of the finished part. So my CAD model is for reference only. The checking fixture(s) might check form, function, or both. Here is one of the previous discussions: http://www.eng-tips.com/viewthread.cfm?qid=313733 Peter Truitt Minnesota

I am still thinking about cubical vs. spherical tolerance zones. One of the attached illustrations shows a cube, with a basic surface and its boundaries, similar to Paul’s. The other illustration (same PDF) shows the same basic surface and boundaries, but clipped by a circumscribed sphere. My...

Thanks, Checkerhater, I guess I am not sure how to check either Paul Jackson's refined approach or the variation I asked about other than employing analysis software that would analyze a point cloud. I keep thinking about the benefits of round vs. square tolerance zones, but I know that we are...

Checkerhater: I'm thinking of the surface patch where it is limited by a basic sphere. Peter Truitt Minnesota

Rather than 40 x 40, why not 40DIA ? Is that better, worse, or the same? Peter Truitt Minnesota

Thanks, Ben. I agree. Can you recommend any books that bring addition insight into configurations, document numbering, and part numbering that is not covered by Watts and Garwood? Peter Truitt Minnesota

Ben, Watts would agree with example 'A', but not 'B'. I am not saying that "B' could not work, but it has a different logic that conflicts with example 'A'. Peter Truitt Minnesota