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I received a comment on last month’s Tip regarding the placement of dimensions on the drawing. Specifically, the issue was the 30 BASIC dimension. Notice on the revised drawing that the 30 has been replaced by the 21.21 BASIC dimension at the 45° angle. The comment came from someone who inspects parts. His point was that in order to inspect the part, he would have to calculate this dimension. The actual part definition and tolerance have not changed. Since inspection receives and must use the print, they are design’s customer. Why not satisfy the customer by giving them what they need if the actual requirements do not change? It is always good design practice to review dimensioning schemes with all stakeholders.
This tip is in accordance with ASME Y14.5M-1994, Y14.5-2009 and Y14.5-2018.
This tip was originally released in May 2000.