Creo 2.0 measure tool. Can the measure tool be configured to infer the axis of holes and radii if no axis datums exist?

[rbast]

My measure tool will not infer axis of my parts.  I don't know if this is a setting issue, user issue or a lack of functionality of the program.  With assemblies of more than 150 parts others have worked on in conversions from one CAD system to another.  I don't want to have to edit every part I have to add an axis datum in order to measure or constrain.  Creo is great at finding surfaces of diameters and radii on parts but I don't want that information for either measuring or constraining.

How do I get this program to infer axis?

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[MartinHanak]

Hi,

please attach a picture showing what do you want to measure .

MH

[rbast]

I figured out with measuring that I can choose in the analysis window to choose use as axis or use as center.

With contraints I have an iges and a part.  I have to go into the iges and create an axis datum because the constraints function keps wanting to do tangency when I want coincident axis or surfaces.  It wont recognize the iges file surface. 
I can't give you pictures due to security reasons.  I don't think I would have these issues if we were not dealing with converting between programs.  Our conversion software creates issues, but I have no control over that. 
Anyway I had another issue where I wanted to use angle offset and coincidence.  A part rotating on a shaft.  When I used coincident on the shaft and part using surfaces it would lock it so it wouldn't spin and the angle offset wouldn't work.  I had to create an axis on the shaft (again a dumb solid) in order for the part to have spin.  Then I used angle offset to get the right positioning.  If the program would infer a cylinder axis on a the dumb solid I wouldn't need to create a axis datum.  But it looks like I'm out of luck there.

[StephenW · Accepted solution]

I believe you are not getting true diameters/radius conversions. To verify, go to the ANALYSIS tab, MEASUR drop down arrow, and select DIAMETER and attempt to select the surface you assume is a diameter/radius. CREO will not select anything except "radial" type geometry (edges/curves/surfaces). If nothing can be selected then you are not getting a good conversion.

CREO will assume centers on any 2 cylindrical surfaces (dumb solid or real features) as long as they are true diameters/radii. I verified on a step file I imported.

I suspect the conversion is your enemy.