
12-09-2011, 09:16 PM
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| | | Join Date: May 2009 Location: usa
Posts: 8
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Originally Posted by Bferguson5 I too am new to OpenDMIS and, unfortunately have been stuck with the oldest version (1.0) of the software. I was curious to see if anyone would know how to align a CRD system to circle features on a part. The part that I am trying to program is circular with thru holes at each quadrant that I am trying to align my CRD to. The problem is the CRD always is skewed on the XY plane causing my tolerances to be thrown off. All I want to do with this part is program it to align the CRD to the center of the part with the X and Y axsys' directly through the respective through holes.
If anyone could help me with this I would greatly appreciate it. Thank you. |
The thing I do in that case is pick up the through holes and make a best fit line out of them. Then build your coordinate system from the top of the part as your Z direction/origin, the OD or ID of the part as your Y (or X) origin , and finally, the best fit line as your X (or Y) direction/origin*. *You'll have to set your OD or ID as your X and Y origin depending on weather your holes comprise your datum or the axis of the part does. Obviously, you can choose holes opposite of each other or (assuming the holes are equally spaced about the axis of the part) choose holes next to each other or even both sets of holes for your X as well as your Y. Guess it depends mostly on what features you need to align to but most likely the axis of the cylindrical part is most important. The best fit line will 'clock' your coordinate system even though it may not be the feature that you want to use for the origin of your datum. This make sense? Hope it helps.
Last edited by joe perry; 12-09-2011 at 10:11 PM.
Reason: missing part
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