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2D or 3D Dimensions

bradburrows
Hello,

I'm quite new to the CMM universe and I have a measuring task where I'm unsure if I evaluate it correctly.

The task is the distance between MP_D2 and D2_DOM8.25_P2.

I read that the 2D distance is a projection of the measuring points on a plane referring to the coordinate system.

And that the 3D is the distance referring to the part?

I dont know how I should evaluate it and the differ of both results is really high.

Thanks in advance!

Best regards, Brad.
Parents
  • First:

    Think of a workplane as the "eyes" of the software.

    PC DMIS can only "see" 2d features if it is "looking at it" correctly.

    Imagine if you will a line in three dimensional space... It is a straight line that is following the Y+ axis of your alignment and it has no slope it is just a straight line. You could "see" the line if your workplane was ZPLUS (looking down at it), if your workplane was ZMINUS (standing below it looking up, if your workplane was XPLUS (standing on the right side), and also if your workplane was XMINUS (standing on the left side). You would NOT be able to "see" the line if your workplane was YPLUS or YMINUS because from those perspectives all the software can "see" in 3d space is a point (start point or end point of line).

    SO....

    When creating a program in PC DMIS, you must pay attention to your workplane. When you are measuring 3D features (planes, cylinders, cones, etc) you can be in any workplane you want because the software can "see" them...BUT...when you are probing 2d features OR constructing things & 2d features are being used, you MUST be in a workplane that will allow the software to "see" what it is constructing or you will get junk features/results that make no sense.

    Second:

    We would be happy trouble-shoot your program but would have to see it first. There are too many variables here for us to suggest a fix especially since you are so new to this.
Reply
  • First:

    Think of a workplane as the "eyes" of the software.

    PC DMIS can only "see" 2d features if it is "looking at it" correctly.

    Imagine if you will a line in three dimensional space... It is a straight line that is following the Y+ axis of your alignment and it has no slope it is just a straight line. You could "see" the line if your workplane was ZPLUS (looking down at it), if your workplane was ZMINUS (standing below it looking up, if your workplane was XPLUS (standing on the right side), and also if your workplane was XMINUS (standing on the left side). You would NOT be able to "see" the line if your workplane was YPLUS or YMINUS because from those perspectives all the software can "see" in 3d space is a point (start point or end point of line).

    SO....

    When creating a program in PC DMIS, you must pay attention to your workplane. When you are measuring 3D features (planes, cylinders, cones, etc) you can be in any workplane you want because the software can "see" them...BUT...when you are probing 2d features OR constructing things & 2d features are being used, you MUST be in a workplane that will allow the software to "see" what it is constructing or you will get junk features/results that make no sense.

    Second:

    We would be happy trouble-shoot your program but would have to see it first. There are too many variables here for us to suggest a fix especially since you are so new to this.
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