NX2 discrepancy in face to face distance measurement

[qz5y48]

I have a parasolid created from a step, that was saved from Pro-e assembly file. My customer has rejected the model because they say the distance between two of the parts is incorrect. When I measure the distance between the two faces, one on each part, I get one measurement(132.38), and I measure the distance any other way(creating a perpendicular line between the two faces, dimensioning a view in drawing, placing two planes on each surface and measuring distance, etc.) I get 132.0(the correct number). These two faces are planer and parallel. Has anyone seen this problem? I need ammunition to go to my customer and explain what's going on. Thanks

 

[HellBent]

I'll have to assume the distance you're getting while in 3d (132.38) is the right number. How are you creating your perp line? Are you extending it beyond the surfs then trimming it? If so be sure your trim function isn't set relative to wcs....set it to "shortest 3d distance". In drafting if you open it up to more decimal places what does it say? And are you sure your geometry is flat to that view?

Take care...

 

[qz5y48]

The two faces are also parallel to the x-z plane at absolute zero. So the views I'm throwing into a drawing are true views. They are reading zero to the sixth decimal place on the drawing. As for the creating of the perp line, how many ways are there to create them? I've tried as many way as I can think of thinking the same way you are hellbent, all results give me 132.0000000. Also I tried translating that piece .38, and when I remeasured the face to face difference I get 131.62. I'm convinced its a glitch somewhere.

 

[HellBent]

hmmm...weird. Doesn't sound like it's anything you're doing wrong. I've never ran into that. I can only guess it has something to do with the translations but the discrepencies between modelling and drafting are what's throwing me for a loop. As far as the line between 2 surfs there are a couple ways to make them. One is to have the distance analysis create the minimum distance line. That is not necessarily perp to anything though. The only way I know to do it perp is to use a point to start from and a surf as it's perp reference. From the basic curves menu first select your start point, then open the point method pulldown and set it to "Select Face". Select the face you want to be perp to. Then drag your line beyond the surface you want to intersect and just click out in space for your endpoint. Finally, trim the curve off using the second surf. Be sure to have your trim method set to shortest 3d distance. You can then measure the angle of that line to the 2nd surf to verify it's perp. By the way...that surf you pick for the line to be perp to when you create it doesn't have to be a flat surf. If you have a point projected onto a curved surface to start from you can create a perp line from that point relative to that curved surface. Comes in handy sometimes.

Take care....