Alignment-newbie help please

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  • Alignment-newbie help please

    Boss brings another piece for me to learn on today. Happy Happy Joy Joy.
    Anyway, the plate is .300 thick and 12.000 diameter. I laid the plate down on the cmm with the origin hole( per the drawing) ( which is at the bottom area of the plate) facing me at the front of the machine.Note: all holes are in the Z axis. The drawing indicates the hole pattern is realitive to the center of the part . However, all locating dimensions come from the origin hole. Well. I leveled the plane with 3 points, but how do I align the rest of the part? There is a hole at the top of the part, which is in line with the origin hole at the bottom for a Y axis. There is group of holes that are in the X axis just above the origin hole. My thought would be to level Z, construct a line between the top hole and the origin hole for Y ( rotate), and then construct a line between the far left X axis hole and the far right X axis hole to origin. I did this , but the origin location on the screen didn't put X,Y,Z at the origin hole location. So I called alignment back up and called circle1 ( origin hole) to X,Y. origin. The origin was placed at the origin hole on the drawing, but I am not for sure this is really right. Setting the part up on the layout plate, i would insure the origin hole was at zero in both X & Y axis, as the Z would be 90° perp to these, and then start measuring. Well, thanks to all that can help. I hope this is not too confusing. This is really a piece of cake job to someone who can use the machine properly. Thanks again.
    I don't feel tardy!sigpic
    B&S "One" V4.2
    Discovery D-12 V4.2

  • #2
    That sounds right to me. Or you could make the line the origin for the x axis, the hole for the y and the plane for the z. I assume all measurements are based off the hole you called the origin?
    sigpic
    If A Pretty Poster And A Cute Saying Are All It Takes To Motivate You,
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    • #3
      What I would do would be a 3-2-1 alignment off the top of the part and the 2 holes that are in line, which it sounds like you did. Also, is there any cad?
      sigpic
      If A Pretty Poster And A Cute Saying Are All It Takes To Motivate You,
      You Probably Have A Very Easy Job. The Kind Robots Will Be Doing Soon.

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      • #4
        plane on top Z
        Line from Center hole to hole on right x axis

        Origin xy center hole
        z plane on top plate
        sigpicSummer Time. Gotta Love it!

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        • #5
          No cad model available. I don't know how to use the cad part of Dmis yet anyway. I will soon, I hope. One of my friends always reminds me that I will not always be able to have a cad model, so get use to the measuring without one. If you have one great!, but if not, you'll still have no problem getting through the part.
          I don't feel tardy!sigpic
          B&S "One" V4.2
          Discovery D-12 V4.2

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          • #6
            I dont have a drawing, but from how discribe it I would do an initial line-up then level Z+, zero origin feature, Then do a 2D best-fit alignment from the remaining features with rotate only option. Note: theoretical values of features must be correct in order for it to work.

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            • #7
              2d is fine if you want to spread the error out, but if you have datums, you have to use them. I used to layout to prints that didn't have datums and I just had to assume if everything was called back to one or two fetures then those were the datums. Like Darin said, hard to tell without a drawing.
              sigpic
              If A Pretty Poster And A Cute Saying Are All It Takes To Motivate You,
              You Probably Have A Very Easy Job. The Kind Robots Will Be Doing Soon.

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              • #8
                Does the print have any datums on it with feature control frames for the diameters....GDT

                Just curious
                sigpic.....Its called golf because all the other 4 letter words were taken

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