Hole Form Dimension - Shaft dimension which is +-.015

J

jdm2008

#1
I have a shaft dimension which is +-.015. I've been seeing issues with circularity on this dimension and and the suggested change was to add a form error(circularity of .015).
Wouldn't the status quo already have as strict a tolerance? To meet the basic dimension around the entire circle, form error must be less than .015. Also isn't dimensioning the part in this way actually making the tolerance less strict since the part could be +.013 and have a form error of .010?
 
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Jim Wynne

Staff member
Admin
#2
Re: Hole Form Dimension

You want to control the two things--size and circularity--separately. If the diameter tolerance is ?.015 and you applied a circularity tolerance of .015, the effect could be the opposite of what you want. If the size tolerance is what it needs to be, determine how eccentric the hole can be without causing trouble, and use that as a guide for setting the circularity tolerance.
 
T

True Position

#3
A diameter tolerance is (in ASME Y14.5 world) always applied to the 'functional diameter', either the outermost points of a male feature or inner points of a female feature. (aka what the mating part would see.)

What type of gage are you using? What process made the OD in question?
 

Kingsld1

Involved In Discussions
#4
Form tolerances such as circularity are a refinement of the size tolerance. Currently your size tolerance would allow .030" of circularity. The purposed change would retain the size tolerance but cut the allowed circularity in half.
 
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