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Measures in two axes - help a rookie out

khve23
Please if anyone can help a rookie..
I basically got a romer arm handed to me, and I had to learn alot by myself. Alot do makes sense, but sometimes I get really confused though PC-DMIS is not very intuitive when something goes wrong.
Basically I am measuring a piece which is offset and also in two different axes. I have done this several times, getting the correct results according to the drawing. At first i measure a plane and circle to align the position, leveling out Z with the plane and connects the circle to XY. The plane measured in Z to align is also the plane i want a distance from to a hole measured in Y (I have to change the view to even get a full circle in the right axis). So I want a distance from Z to Y. The plane is level to earth (xD) and the hole you can physically see in Y. OK? So why.. when it is supposed to be 320mm +- 3mm nominal, I get 327 measured value? I have checked by measuring manually, and its 322mm - perfect..
My logic wants to think that to at all be able to get right result you have to see in Y axis. Logically you can't see the hole measured in Y from Z view.

Parents
  • If you distance from a plane in Z to a hole in Y, the value is taken from the centroid of the plane to the centroid of the hole (unless you tell PC-DMIS otherwise). Your planes centroid will end up at different places each time you measure that plane. It is also giving you the shortest distance between your two features. A distance in Z (height) from the plane to the hole in Y is easy and sounds more "correct"?

    I suggest you post a crude snippet/drawing of the part and what you want to accomplish and we can take it from there.

    I'm new to this forum, so maybe I have to quote you for you to see my reply. I'm sorry! Slight smile My reply above.
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  • If you distance from a plane in Z to a hole in Y, the value is taken from the centroid of the plane to the centroid of the hole (unless you tell PC-DMIS otherwise). Your planes centroid will end up at different places each time you measure that plane. It is also giving you the shortest distance between your two features. A distance in Z (height) from the plane to the hole in Y is easy and sounds more "correct"?

    I suggest you post a crude snippet/drawing of the part and what you want to accomplish and we can take it from there.

    I'm new to this forum, so maybe I have to quote you for you to see my reply. I'm sorry! Slight smile My reply above.
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