Programming off CAD

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  • Programming off CAD

    Hopefully a quick question.
    I'm programming of a CAD model (well an IGES in curves and surfaces mode)
    and I have created my manual alignment by going into probe mode to pick up my plane (then level it) then into auto features to pick up two circles (othe two datums) then I create my manual alignment. NOW, when I switch to DCC mode, what is the BEST way to create the DCC aligment? Re-do exactly what I did in manual mode? or can I cut and paste the previous alignment?

    The quicker the responses....the faster my blood pressure will go down! LOL.

    Thanks everyone.
    CMM Programmer
    Jackson Michigan
    Mistral 7.7.5
    4.3MR2

  • #2
    You should do it the same way as in the manual aligment. That is what I learned in the classes do the same but using more hits on the datums. I am pretty new to this stuff myself but it has worked for me. Good Luck
    Last edited by Ken379128; 07-21-2006, 07:36 AM.
    Since I gave up hope I feel much better !!!

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    • #3
      Yup, do it again in DCC, the machine will do a better job of probing the feature than you ever could with a joystick.

      .02

      TK
      sigpicHave a homebrew

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      • #4
        You can cut and paste the manual alignment features, but make sure you add move points and rename the features. I try to use the simplest manual alignment I can. It doesn't need to beset up to the datum scheme. I try to make it features I can probe easily. Then, I offset to whatever them datum scheme is. Finally I measure the datum scheme in DCC. Using that for an alignment. Makes it easier when running the program.
        When in doubt, post code. A second set of eyes might see something you missed.
        sigpic

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        • #5
          .

          I think I was misunderstood. I know I have to do a DCC alignment, I was wondering the best way to create the DCC aligment. Do I just re-do it the same way I created my manual alignment? Or can I "cheat" and copy and paste the manual alignment into DCC mode and get the same results?


          EDIT: Thanks John, you were replying while I was typing this up.
          CMM Programmer
          Jackson Michigan
          Mistral 7.7.5
          4.3MR2

          Comment


          • #6
            Originally posted by Sl33stak
            I think I was misunderstood. I know I have to do a DCC alignment, I was wondering the best way to create the DCC aligment. Do I just re-do it the same way I created my manual alignment? Or can I "cheat" and copy and paste the manual alignment into DCC mode and get the same results?
            It should work. I've done it.
            When in doubt, post code. A second set of eyes might see something you missed.
            sigpic

            Comment


            • #7
              You can certainly cut and paste, I've done it many times. But I agree with John K, I always use the easiest features to probe when doing my manual alignment, then follow with 2 dcc alignments. The manual alignment is used primarily just to tell the machine, hey this is where my part is.....
              We set up all of our parts here with one manual, and 2 dcc alignments cause we nest our parts in a way that allows us to repeat the placement on the table within about .05" or less. ONce the original manual alignment is done, we rarely need to re-do it, just plop the part on the fixure, in the right location and the 2 dcc alignments take care of the rest.

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              • #8
                I will copy and paste after the manual alignment, but I will change holes/slots to auto features, and modify the hit locations of other features so that they are taken at the same levels (lines).

                Tim

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                • #9
                  I try to keep my manual to a minuim. I do a really simple align. "just enough so the CMM can find the part".
                  Then I go in and do a alignment that is going to really zero in on the part.
                  One thing to note here is I always use Iterative alignments.
                  If your doing CAD EQUALES PART this won't be a good way to go.

                  Comment


                  • #10
                    iterative alignment

                    PC-DMIS instuction for CAD file import
                    create new program (note Measurement units (mm or Inch) must be the same as CAD file)
                    File Import (type of STEP and IGES are the easiest.) model.
                    Click on file name
                    import (note different files types have different bottons to click on)


                    after import.

                    Click on View Step Up button
                    Click on Solid
                    Apply - OK

                    edit - Preferences - Set up - Part/Machine
                    Part "Setup Field"
                    for the following determine how part will sit on CMM.
                    Cad "+X axis equals Which machine axis? axis drop down field
                    Cad "+Y axis equals Which machine axis? axis drop down field
                    Cad "+Z axis equals Which machine axis? axis drop down field

                    Insert - Feature - Auto (for example using circles)
                    Graphics window Zoom in on a Circle.
                    Click on edges of circle 3 places
                    (Important things to look for "Depth" probe will measure below surface
                    and "Distance" the distance the probe will be from the surface.)

                    Click create.

                    repeat on 2 more circles.

                    Insert - Alignment - New - Iterative
                    Click on all 3 circles (Could use 3 Auto Surface Points)
                    click on select
                    click on 2 circles
                    click on select
                    click on 1 circle
                    click on select

                    click Meas All Once.
                    (this will tell the machine measure all 3 features in DCC)
                    Click OK

                    POP UP Measure ALL inter align features now?
                    Click NO

                    Click OK on Alignment Utilities POP UP window.
                    POP UP Measure ALL inter align features now?
                    Click NO

                    File - Save

                    If you want, you can do another alignment to flip Graphics window axis to what you are use to.

                    Now run program.

                    after run you can insert MODE/DCC

                    Using auto Features just click on cad model
                    2014 SP5, DataPage + v5.0 #331
                    [testing v2015.1]

                    Comment


                    • #11
                      Originally posted by david phillips
                      PC-DMIS instuction for CAD file import
                      create new program (note Measurement units (mm or Inch) must be the same as CAD file)
                      File Import (type of STEP and IGES are the easiest.) model.
                      Click on file name
                      import (note different files types have different bottons to click on)


                      after import.

                      Click on View Step Up button
                      Click on Solid
                      Apply - OK

                      edit - Preferences - Set up - Part/Machine
                      Part "Setup Field"
                      for the following determine how part will sit on CMM.
                      Cad "+X axis equals Which machine axis? axis drop down field
                      Cad "+Y axis equals Which machine axis? axis drop down field
                      Cad "+Z axis equals Which machine axis? axis drop down field

                      Insert - Feature - Auto (for example using circles)
                      Graphics window Zoom in on a Circle.
                      Click on edges of circle 3 places
                      (Important things to look for "Depth" probe will measure below surface
                      and "Distance" the distance the probe will be from the surface.)

                      Click create.

                      repeat on 2 more circles.

                      Insert - Alignment - New - Iterative
                      Click on all 3 circles (Could use 3 Auto Surface Points)
                      click on select
                      click on 2 circles
                      click on select
                      click on 1 circle
                      click on select

                      click Meas All Once.
                      (this will tell the machine measure all 3 features in DCC)
                      Click OK

                      POP UP Measure ALL inter align features now?
                      Click NO

                      Click OK on Alignment Utilities POP UP window.
                      POP UP Measure ALL inter align features now?
                      Click NO

                      File - Save

                      If you want, you can do another alignment to flip Graphics window axis to what you are use to.

                      Now run program.

                      after run you can insert MODE/DCC

                      Using auto Features just click on cad model
                      What if the origin of the iges model is not on the part (soild model) but floating in space?

                      Comment


                      • #12
                        Originally posted by calbritton
                        What if the origin of the iges model is not on the part (soild model) but floating in space?
                        Doesn't matter, the origin can be anywhere, you are simply matching the part orientation to the CAD orientation with your alignment. In automotive we deal with incar coordinates all the time where the origin is in the middle of the car.
                        "A good design is the one that allows engineers the ability to change gracefully what they forgot to do right the first time!!!"

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