Profile of a Surface Tolerance - Part with a 195 mm radius on it

K

Kamranabbasian

#1
I have a part with a 195 mm radius on it. the general dimensinal tolorance is +/-0.5mm. There is also a surface profile toltrance for 0.05mm. It is confusing for us to check this part on the CMM. what would be the radius tolorance considering 0.05mm profile limit 194.5 to 195.5 or 194.975 to 195.025?

 
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Stijloor

Staff member
Super Moderator
#2
Re: Profile tolorance

I have a part with a 195 mm radius on it. the general dimensinal tolorance is +/-0.5mm. There is also a surface profile toltrance for 0.05mm. It is confusing for us to check this part on the CMM. what would be the radius tolorance considering 0.05mm profile limit 194.5 to 195.5 or 194.975 to 195.025?

The profile tolerance takes precedence over the general tolerance.
(Assuming that this general tolerance is stated in the title block).

Is there a basic radius of 195 mm specified? (the 195 in a box?)

The default for profile of a surface is that the 0.05 total profile tolerance zone is equally disposed about the true profile. This means 0.025 above and 0.025 below true profile.

Now, this clarification is provided to you without seeing the actual call-out on the drawing. It is always helpful to attach a sketch.

Hope this helps.

Stijloor.
 

Jim Wynne

Staff member
Admin
#4
Re: Profile tolorance

I have a part with a 195 mm radius on it. the general dimensinal tolorance is +/-0.5mm. There is also a surface profile toltrance for 0.05mm. It is confusing for us to check this part on the CMM. what would be the radius tolorance considering 0.05mm profile limit 194.5 to 195.5 or 194.975 to 195.025?
Thanks for your information. I have attached the sketch also,
I don't see a profile callout on your sketch, or a 195mm radius.
 

Paul F. Jackson

Quite Involved in Discussions
#5
Re: Profile tolorance

The radius 195 is basic so it does not have general tolerance.
The profile callout has no datum reference associated to it so it can only constrain the form of the semi-cylinder... not its orientation or location.

It is difficult to orient and fit an axis to a small portion of a cylinder but that is what must be done to examine its form relative to a perfect cylinder of 390 diameter.

A number of ideas pop into my mind of artifacts that I would look around for to lay in the semi-cylinder and probe its perpendicular surfaces to approximate the orientation of the cylinder's axis... like the sides of a precision block with precise corner or a Vee block with sharp corners or a couple of large precision roll pins. I hope you see what I mean.

Remember your job is not to discover the size and center of a "best-fit" cylinder but rather compare the minimum possible error/displacement from a best fitted perfect cylinder of 390 diameter.

Paul
 
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