Chamfer Callout?

[Heckdogg]

what is the standard for a callout of a chamfer feature? is it to call out the note with a leader (.25 x 45°) or to add two seperate dimensions (one linear and one angle)?

Thanks in advance

SolidWorks 2005 SP01.1
Intel Xeon 2.8GHz 2GB Ram
NVIDIA Quadro FX700 128MB

 

[ewh]

Either way is allowable.
Per ASME Y14.5M-1994, Chamfers may be dimensioned by a linear dimension and an angle, or by two linear dimensions. If it is a 45 degree chamfer, a note may be used.

 

[ctopher]

ewh is correct. In addition, sometimes a chamfer may have to be separate dim's. If it is ".02x60°", there is no way of knowing which direction the 60° is coming from. It could end up as a 30°. So, sometimes you have to dim the distance and and angle as separate dims.
Also, I believe the new way to dim an angle is without the word "cham" or "chamfer", just the dim ".02x60°".

Chris
Sr. Mechanical Designer, CAD
SolidWorks 05 SP2.0 / PDMWorks 05
ctopher's home site
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[Heckdogg]

Thanks guys

SolidWorks 2005 SP01.1
Intel Xeon 2.8GHz 2GB Ram
NVIDIA Quadro FX700 128MB

 

[ewh]

Good clarification, Chris. On a related note, which comes first in a chamfer note, the dimension or the angle? The spec example shows the dimension first, but since it is not spelled out (and some of their examples are vague) I've had difficulty in the past proving to others that this is the correct method. I realize that I am getting close to being anal here, but it would be nice to know. Any thoughts on this?

 

[ctopher]

I have always used dim first, then angle. Most machine shops I have talked to say they measure the distance first then cut the angle. I will have to look again to see if it is in a spec.

Chris
Sr. Mechanical Designer, CAD
SolidWorks 05 SP2.0 / PDMWorks 05
ctopher's home site
FAQ371-376
FAQ559-1100
FAQ559-1091
FAQ559-716

 

[RedPen]

All,
Chamfers are now properly called out with the distance first and the angle second, .25 X 45 deg per ASME Y14.5M-1994. Previously, ANSI Y14.5M-1982 had them the other way around, "angle X distance". As a memory jogger for the proper order, I think of the word "dangle". Chamfer notes 'dangle' on a leader off the end of the shaft and are specifed as Distance X ANGLE.

Many of my machinist friends and I still can't figure out why it was changed since "it wasn't broken" before.

RedPen