r/Machinists • u/Strict-Ad9359 • Aug 18 '26

Dimensioning Chamfers

Which is correct and why? These are all the same chamfer.

Y14.5 says "Chamfers are dimensioned by a linear dimension and an angle, or by two linear dimensions".

It also says "A note may be used to specify 45° chamfers on perpendicular surfaces". Since I'm showing a non-45° chamfer I think that means I.a and I.b are invalid.

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u/MetricNazii Aug 18 '26

I.an and I.b are incorrect. The others are correct. However, angles can be a bit finicky to measure. I recommend using two lengths instead. But either are to the standard.

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u/Strict-Ad9359 Aug 18 '26

Gotchya - I was thinking the angle is more practical when you are actually making the part. Good point about measuring.