Can I put Position control on a Radius
Can I put Position control on a Radius
(OP)
I've never come across this before so I turn to Eng-Tips
I have a checker marking up my drawing to add position control to a radius.
My thought is No. Because I'm thinking you need a complete hole or shaft to measure two opposing sides to derive the center to make sure it falls within the positional tolerance.
We are working with ASME Y14.5-1994 and I couldn't find anything specific in Section 5. But there are no examples of radii with positional tolerance.
I have a checker marking up my drawing to add position control to a radius.
My thought is No. Because I'm thinking you need a complete hole or shaft to measure two opposing sides to derive the center to make sure it falls within the positional tolerance.
We are working with ASME Y14.5-1994 and I couldn't find anything specific in Section 5. But there are no examples of radii with positional tolerance.





RE: Can I put Position control on a Radius
Personally, I hate to apply anything but profile to a radius that under 90d or arc. Under 180d of arc I start to use caution, personally. Whether it's legal or not... I don't know absolutely, off the top of my head. I just want to add caution. It can be difficult to accurately measure/gauge such a requirement, in my experience.
My personal feelings may be guided by the heavy use of CMMs and laser scanners more than hard gauging, though.
RE: Can I put Position control on a Radius
Ask your checker how he thinks someone will inspect the feature.
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JHG
RE: Can I put Position control on a Radius
You are right, position can only apply to a FOS(feature of size) or a pattern of FOS. Attached is a tip from Tec-Ease Aug.1999.
Season
RE: Can I put Position control on a Radius
Certified Sr. GD&T Professional
RE: Can I put Position control on a Radius
John Acosta, GDTP Senior Level
Manufacturing Engineering Tech
RE: Can I put Position control on a Radius
In support of SeasonLee's and powerhound's answers, the following paragraphs from ASME Y14.5M-1994 should convince you (if you are not already) that your radius is not a feature of size:
pylfrm
RE: Can I put Position control on a Radius
This does NOT apply directly to your post about what are "regular" FOS. But from an "expanding your understanding" there are related terms to consider. For example: there are "irregular" features of size that are not "full" features but that can capture an actual mating envelope. Please see the attached.
Certified Sr. GD&T Professional
RE: Can I put Position control on a Radius
John Acosta, GDTP Senior Level
Manufacturing Engineering Tech
RE: Can I put Position control on a Radius
Thanks for adding the important distinction! I assume everyone has migrated to 2009 since it been almost 10 years since its release (and 1994 is almost 25 year old technology)
Certified Sr. GD&T Professional
RE: Can I put Position control on a Radius