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Does the ISO allow for Radial Datums Features?

Does the ISO allow for Radial Datums Features?

Does the ISO allow for Radial Datums Features?

(OP)
Does anyone know specifically if the ISO allows for datum features to be used on a partial diameter feature (radii)?

RE: Does the ISO allow for Radial Datums Features?

Don't know for sure, but I'm looking at ISO 5459 and I don't see any provision for such a thing.   

John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
http://www.gdtseminars.com

RE: Does the ISO allow for Radial Datums Features?

J-P,
Which version do you have? 1981 or 2011?

RE: Does the ISO allow for Radial Datums Features?

By golly ... it's 1981.

John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
http://www.gdtseminars.com

RE: Does the ISO allow for Radial Datums Features?

(OP)
Thanks, guys
thread1103-314002: Can i use a point as my datum?
The part in that thread sure seems like an example of where you might want to use a partial dia as a primary datum at RFB.
Frank

RE: Does the ISO allow for Radial Datums Features?

Frank, of course it is possible that the radial feature is a good one for serving as a primary datum feature, but for me there is not enough info to be sure about this, we do not see or know anything about mating conditions of the part.

I will try to organize newest edition of ISO 5459 (2011) which deals with datuming, but to be honest I do not expect to find anything clearly legitimizing usage of such kind of features as datum features. Let's hope I am mistaken.

On the other hand - as you well know - ISO GPS standards philosophy is to show rather generic than specic examples of geometrical tolerancing, so lack of clear indication of a concept does not mean that the concept must be considered prohibited right away.    

RE: Does the ISO allow for Radial Datums Features?

(OP)
pmarc,
Thanks, I agree we do not know that is why I started a separate thread not to confuse his other issues and allow myself the flexabliity to "say" how it mounts to make this point. I do feel it looks like the part he shows will mate to a shaft with the screws shown. The shaft will align the part when drawn tight with the screws forcing an alignment of the radius to align along the shaft diameter.
I wanted the freedom to dicuss this radius as a datum thing.
Frank

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