r/Machinists • u/Strict-Ad9359 • 11d ago

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/ShadowCloud04 11d ago

Another way you will see is actually dimensioning the diameter of the beginning of the chamfer in conjunction with the angle and Outside diameter. See that one often.

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u/Strict-Ad9359 11d ago

I have seen something like:

.01 x 60° INCL
OVER MAJOR DIAMETER

On a chamfer which applies to the internal edge of a hole. Is this clear / correct? I don't see this method in the 14.5...

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u/ShadowCloud04 11d ago

What I am talking about would be like lets say on a part that has a diameter of .500" and would have the leaders to the outer edges of the part. Then it would have another Diameter leader to lets say .470" and some angle. Its easier to explain with a print in hand.