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Must all revisions be backward compatible with their previous revision?

Question asked by Carl Kauffman on Dec 1, 2015
Latest reply on Dec 1, 2015 by Carl Kauffman

I create a  screw-on cap for a coffee mug and release it as Revision A.

If the cap leaks, I change the depth of the groove for the seal. After the depth change, the part becomes Revision B.

Now, Revision A and B will both fit the mug and Revision B is backward compatible to Revision A.

 

If I change the thread to a finer pitch, creating more pressure on the seal, does the part still become Revision B, or would the part require a new part number?

Now, Revision B will no longer fit the same mug as Revision A, so Revision B is not backward compatible to Revision A.

 

Must all revisions be backward compatible with their previous revision?

 

Thank you,

Carl

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