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Need alignment explained

I'm new and I am having a hard time grasping how to set alignment on a part. If I have a block sitting in front of me. My x goes right and left, y, away and towards me and my z up and down. I would click on alignment and choose plane, line, point? Then the software prompts me to take a plane. If I take hits on the top of the block as a plane, level to it in the z plus. Then my line, do I take a line on top from left to right or do I take the points of the line on the plane in front of me (y plane?) Then what, I am lost when it comes to rotation. If I take it on top of the part from left to right, is that xplus direction rotated around zplus? Where does the point need to be taken and why? Very lost. I'm a pretty smart guy, can read a print but have no experience with PC Dmis and very little with GD&T. Is there a website or good book I can reference? lol

Thanks,
Mike
Parents
  • Look at it THIS way.....

    You need a MINIMUM of (3), (2), (1) points to set all you need for an alignment. This can be PLANE, LINE, POINT, which satisfies the 3-2-1 minimum requirement.

    Each "group" of points "needs" to be measured with the CMM moving in ONE axis, and each group needs to be a different axis.

    SO:
    Plane on top, 3 hits minimum, moving in the Z axis
    Line on front, 2 hits minimum, moving in the Y axis
    Point on "right" or "left" side, moving in X axis

    This is just the VERY basic, very minimum needed to do a "full" alignment (leve, rotate, and 3 axis origins).
Reply
  • Look at it THIS way.....

    You need a MINIMUM of (3), (2), (1) points to set all you need for an alignment. This can be PLANE, LINE, POINT, which satisfies the 3-2-1 minimum requirement.

    Each "group" of points "needs" to be measured with the CMM moving in ONE axis, and each group needs to be a different axis.

    SO:
    Plane on top, 3 hits minimum, moving in the Z axis
    Line on front, 2 hits minimum, moving in the Y axis
    Point on "right" or "left" side, moving in X axis

    This is just the VERY basic, very minimum needed to do a "full" alignment (leve, rotate, and 3 axis origins).
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