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Use of composite geometric positional tolerancing on cylindrical surfaces

Use of composite geometric positional tolerancing on cylindrical surfaces

Use of composite geometric positional tolerancing on cylindrical surfaces

(OP)
Is this possible? I see cases where a hole pattern can float as a group on a cylindrical surface but the in-pattern positional tolerance must be controlled to insure fit. How would one establish a datum reference frame for this scenario? TIA.

Bruce

Tunalover

RE: Use of composite geometric positional tolerancing on cylindrical surfaces

A sketch could help. Can you post anything?

RE: Use of composite geometric positional tolerancing on cylindrical surfaces

(OP)
pmarc-
I'm not at work and won't be in the foreseeable future so I have no sketcher or CAD system to use to generate a sketch. My scanner is also on the blink so I can't provide a hand sketch either.

Just think of a hollow pipe with a pattern of holes evenly spaced (same angular spacing apart) around the perimeter. The same "z-dimension" would apply to each member of the group but in a general sense I suppose it may not have to be that way.

Tunalover

RE: Use of composite geometric positional tolerancing on cylindrical surfaces

Is it more or less something like this?
http://files.engineering.com/getfile.aspx?folder=2...

It is from Y14.5-2009. The standard offers some more figures showing similar configurations and tolerancing schemes - fig. 7-42, 7-43.
In Y14.5M-1994 it shown in figs. 5-24 through 5-27.

RE: Use of composite geometric positional tolerancing on cylindrical surfaces

(OP)
Just what the doctor ordered. Thank you pmarc!

Tunalover

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