[Ma...] Posted January 22 Share Posted January 22 Howdy, Im confused on if what im doing is correct. Datum B is called out as the profile of a surface (it happens to be a cylinder) And B is called out for finding True Position of a bolt pattern, obviously there's no option to select a profile as the secondary datum. At the moment I have created a cylinder and recalled feature points from multiple scans that follow the desired surface and using that as Datum B. I am just looking for some clarification on if this is an accurate way of going about it. Thanks for the help! -Max Link to comment Share on other sites More sharing options...
[Da...] Posted January 22 Share Posted January 22 (edited) It's the radius that is the datum, not the profile. The profile is called out on the datum B surface. The profile looks to be redundant, because the radius tolerance is the same. Edited January 22 Link to comment Share on other sites More sharing options...
[Cl...] Posted January 22 Share Posted January 22 Also, not a very stable datum. Link to comment Share on other sites More sharing options...
[Ma...] Posted January 22 Author Share Posted January 22 Please sign in to view this quote. lol. Link to comment Share on other sites More sharing options...
[Ma...] Posted January 22 Author Share Posted January 22 Please sign in to view this quote. sounds about right, thats kind of what i figured, Thank! Link to comment Share on other sites More sharing options...
[Da...] Posted January 23 Share Posted January 23 (edited) I'm assuming this is in inches. Still, using a 30° radius sector as a datum seems a bit foolhardy, even with a tolerance zone of +0.025"/-0.000". My experience with zeroing on a radius of anything less than a 60° sector have been mostly futile. That radius has to be REALLY carefully machined! I guess the profile was added as if to say "this surface MUST have a +0.025"/-0.000" EVERYWHERE". Not really necessary, IMO.... BTW, what is dimensioned off this datum, and what are the tolerances like for them? Edited January 23 Link to comment Share on other sites More sharing options...
[Ma...] Posted January 23 Share Posted January 23 I would say that for surface profile is missing basic dimension for radius/diameter. It's in MM and even with that tolerance it would be 80,75 +/- 0,125. Is this whole part or is that 1 of x? Link to comment Share on other sites More sharing options...
[Da...] Posted Monday at 04:31 PM Share Posted Monday at 04:31 PM I'm also assuming that there are at least 2 other 'sector elements' of the same radius not shown on the print? Link to comment Share on other sites More sharing options...
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