hexagon logo

Beginner Help with Multiple Alignments

I am measuring a mold cavity that is not supported with 3D CAD so I'm having to do more work manually on the machine. I did my manual and auto alignment with a plane and two dowel holes on the part. This alignment allowed me to do some measurements of the molding surface, and generate a line midpoint that I was going to use as my new XY zero, or A3. Like all new adventures, something has gone wrong. My Y position on A3 is out by about 45mm. I acknowledge that this is operator error but I cant find a mistake. Is there a limit to how many alignments you can do or some protocol that I have not discovered yet?

Thanks in advance, Glenn

Parents
  • Its hard for me to post my code because my CMM has to run independent of our network due to some overly complex security protocols here. But, based on the response, I can "leap frog" a new alignment (A3) based on geometry I have created within the previous alignment (A2)? As long as that is a true statement, I will spend the time to find my mistake. I probably selected the wrong feature when defining my A3. Thanks for the confirmation.

  • I would not leapfrog on a CMM if the part fits within the volume of the machine. 
    It sounds like there is an error in your alignments or a bad hit somewhere. 
    Try doing it again, 3 hits for a plane, 4 hits for each circle, create a line between the circles. Do your first alignment as...
    Level plane to Z
    Set Z origin to plane
    Set XY origin to one of the circles
    Rotate X or Y to the line (whichever is appropriate for your setup)

    Once that is done, assuming your using a Hexagon machine with a NextJogBox, hit the button to change to "part" coordinates and slowly move the probe around and see if its following your parts direction. If you move between the dowel holes your machine should move in a straight line in whichever axis your rotated to.

Reply
  • I would not leapfrog on a CMM if the part fits within the volume of the machine. 
    It sounds like there is an error in your alignments or a bad hit somewhere. 
    Try doing it again, 3 hits for a plane, 4 hits for each circle, create a line between the circles. Do your first alignment as...
    Level plane to Z
    Set Z origin to plane
    Set XY origin to one of the circles
    Rotate X or Y to the line (whichever is appropriate for your setup)

    Once that is done, assuming your using a Hexagon machine with a NextJogBox, hit the button to change to "part" coordinates and slowly move the probe around and see if its following your parts direction. If you move between the dowel holes your machine should move in a straight line in whichever axis your rotated to.

Children
No Data