How to stage a large part through the CMM...

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  • How to stage a large part through the CMM...

    Hi All,

    Here's my dilemma. We have a large part which is approx 420" (10,675mm) long and unfortunately our CMM is approx 276" (7000mm). How do I stage this through the CMM using one program? I seem to recall the 'equate alignment' being mentioned for this situation but I'm unsure how to use it. I never done anything like this before. If someone has a good, robust process I'd definitely like to see it.

    Regards,
    Carter
    Go NAVY!

  • #2
    First of all, Go ARMY!!!! Lol secondly. You can use something called move part and equate the alignment. One of the guys here would have more info on that. My parts are usually small.
    Darroll
    2018R2

    Comment


    • #3
      You use an equate alignment when you have a part that you'll need the operator to physically move during the routine. Most commonly if you have a long part. For example, I once measured hole patterns on an 8ft long plate on a 4-5-4 using equate alignments.

      1) measure datums in position one. create alignment (I did A1)
      2) move the part to wherever you want...but ensure that in this new position you can measure the same datums in the same places as you did in position 1
      3) have the CMM re-measure those same datums in the same spots it did in position 1
      4) create a NEW alignment (A3)
      5) tell PC DMIS to equate the second one back to the first (insert/alignment/equate)


      Code:
      MOVE/CLEARPLANE
      PLN1       =FEAT/CONTACT/PLANE/DEFAULT,CARTESIAN,TRIANGLE,LEAST_SQR
                  THEO/<0,0,0>,<0,0,1>
                  ACTL/<0,0,0>,<0,0,1>
                  TARG/<0,0,0>,<0,0,1>
                  ANGLE VEC=<1,0,0>,RADIAL
                  SHOW FEATURE PARAMETERS=NO
                  SHOW CONTACT PARAMETERS=NO
                  MOVE/CLEARPLANE
      CIR1       =FEAT/CONTACT/CIRCLE/DEFAULT,CARTESIAN,IN,LEAST_SQR
                  THEO/<0,0,-0.0624>,<0,0,1>,1.398
                  ACTL/<0,0,-0.0624>,<0,0,1>,1.398
                  TARG/<0,0,-0.0624>,<0,0,1>
                  START ANG=0,END ANG=360
                  ANGLE VEC=<1,0,0>
                  DIRECTION=CCW
                  SHOW FEATURE PARAMETERS=NO
                  SHOW CONTACT PARAMETERS=NO
      A1         =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
                    ALIGNMENT/LEVEL,ZPLUS,PLN1
                    ALIGNMENT/TRANS,XAXIS,CIR1
                    ALIGNMENT/TRANS,YAXIS,CIR1
                    ALIGNMENT/TRANS,ZAXIS,PLN1
                  ALIGNMENT/END
                  MOVE/INCREMENT,<0,0,1>
                  TIP/T1A90B-90, SHANKIJK=1, 0, 0, ANGLE=-90
                  MODE/MANUAL
                  COMMENT/OPER,NO,FULL SCREEN=NO,AUTO-CONTINUE=NO,
                  Take part and lay in Fixture's Position #2
                  COMMENT/OPER,NO,FULL SCREEN=NO,AUTO-CONTINUE=NO,
                  Put probe at read point (as shown). Press OK for CNC Measurement.
      READPNT_1      =FEAT/POINT,CARTESIAN
                  THEO/<-0.3,0,0>,<1,0,0>
                  ACTL/<-0.3,0,0>,<1,0,0>
                  READPOINT/
      A2         =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
                    ALIGNMENT/TRANS,XAXIS,PNT22
                    ALIGNMENT/TRANS,YAXIS,PNT22
                    ALIGNMENT/TRANS,ZAXIS,PNT22
                  ALIGNMENT/END
                  MODE/DCC
      PLN2       =FEAT/CONTACT/PLANE/DEFAULT,CARTESIAN,TRIANGLE,LEAST_SQR
                  THEO/<0,0,-0.3>,<1,0,0>
                  ACTL/<0,0,0>,<1,0,0>
                  TARG/<0,0,-0.3>,<1,0,0>
                  ANGLE VEC=<0,0,-1>,RADIAL
                  SHOW FEATURE PARAMETERS=NO
                  SHOW CONTACT PARAMETERS=NO
                  MOVE/CLEARPLANE
      CIR3       =FEAT/CONTACT/CIRCLE/DEFAULT,CARTESIAN,IN,LEAST_SQR
                  THEO/<-0.0624,0,-0.3>,<1,0,0>,1.398
                  ACTL/<-0.0624,0,0>,<1,0,0>,1.398
                  TARG/<-0.0624,0,-0.3>,<1,0,0>
                  START ANG=0,END ANG=360
                  ANGLE VEC=<0,0,-1>
                  DIRECTION=CCW
                  SHOW FEATURE PARAMETERS=NO
                  SHOW CONTACT PARAMETERS=NO
      A7         =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
                    ALIGNMENT/LEVEL,XPLUS,PLN2
                    ALIGNMENT/TRANS,YAXIS,CIR3
                    ALIGNMENT/TRANS,ZAXIS,CIR3
                    ALIGNMENT/TRANS,XAXIS,PLN2
                  ALIGNMENT/END
                  EQUATE/A7, TO ALIGNMENT, A6
      Last edited by DAN_M; 07-30-2019, 04:05 PM.
      Beep beep beep..

      Comment


      • FOG_Carter
        FOG_Carter commented
        Editing a comment
        Thanks DAN_M! It'll be a few weeks before I'm done with the program, but unfortunately the CMM install and turnover won't be complete until October. There is one item I'm concerned about is Step 2, but you state:

        "but ensure that in this new position you can measure the same datums in the same places as you did in position 1".

        I will only be able to measure datum A, datum B and C will be inaccessible.
        Last edited by FOG_Carter; 08-09-2019, 10:57 AM. Reason: Clarity

    • #4
      I'd imagine that you could also use a readpoint, after you've moved the part, and realign on an already established feature.

      And, yes.

      Go Navy!

      (USS Wainwright
      CG-28)

      Comment


      • FOG_Carter
        FOG_Carter commented
        Editing a comment
        USS Bergall (SSN-667)

    • #5
      US Army 2nd ACR Celtic Battery Ghost Troop.
      Darroll
      2018R2

      Comment


      • Quality ish
        Quality ish commented
        Editing a comment
        In the Navy, we had outlets and everything. We rarely used batteries...

        Roll Eyes (Sarcastic)

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