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Drawing practice

Drawing practice

Drawing practice

I have a round machined part which has 2 features that were drawn 90° apart but had no relationship or tolerance noted. One was a milled flat and the other a drilled hole. We have made many similar parts over the years and always assumed there was no relationship since none was noted and never had a problem. On this part however our customer has rejected parts because we did not hold the 90° as drawn. My question is "is there a standard which clarifies this situation"?

RE: Drawing practice

Yes, there is.

ASME Y14.5M-1994 1.4 Fundamental Rules
(i) A 90deg angle applies where ... lines depicting features are shown on a drawing at right angles and no angle is specified.

RE: Drawing practice

This assumes that ASME Y14.5M was specified on the drawing.

RE: Drawing practice

Patrick, are you actually working to ISO standards, as this is the Iso forum.

I can't remember if it has equivalent wording to the ASME spec in one of it's many documents.

In ASME the assumed 90° invokes whatever the general angular tolerance is, or if applicable (such as on the outline of a square part) the general size tolerance.


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