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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
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  • In a nut shell here is what I would do.
    1. Plane on the top of the block, level to + Z, set Z origin
    2. Line on the front face of the block - left to right, rotate to that line to the + X about + Z, set Y origin on that line.
    3. Point on the right face of the block, set X to that point.

    Do NOT try to take a line on the top of the block for rotation - it WILL screw you up.
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  • In a nut shell here is what I would do.
    1. Plane on the top of the block, level to + Z, set Z origin
    2. Line on the front face of the block - left to right, rotate to that line to the + X about + Z, set Y origin on that line.
    3. Point on the right face of the block, set X to that point.

    Do NOT try to take a line on the top of the block for rotation - it WILL screw you up.
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