Z axis not setting up where it should

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  • Z axis not setting up where it should

    Hi all,

    I'm aligning my z axis to a plane which I'm taking four hits on, but when i press my probe onto the plane after I've done the alignment, the z co-ordinate is displaying as something like -0.8, anyone have any suggestions as to why?

    Code being used for my alignments is below, the 1.5mm offset in the alignment is to account for the diameter of the 3mm probe and I have played around with that offset without it solving the issue.

    Thanks.

    Code:
    STARTUP    =ALIGNMENT/START,RECALL:USE_PART_SETUP,LIST=YES
                ALIGNMENT/END
                MODE/MANUAL
                FORMAT/TEXT,OPTIONS, ,HEADINGS,SYMBOLS, ;NOM,TOL,MEAS,DEV,OUTTOL, , 
                LOADPROBE/3MM
                TIP/TIP1, SHANKIJK=0, 0, 1, ANGLE=0
                LOADPROBE/3MM
                TIP/TIP1, SHANKIJK=0, 0, 1, ANGLE=0
                COMMENT/OPER,NO,FULL SCREEN=NO,AUTO-CONTINUE=NO,
                Take diagonal plane on RHS of jig
    PLN1       =FEAT/PLANE,CARTESIAN,TRIANGLE
                THEO/<509.224,156.482,48.9>,<-0.125098,0.8082573,0.5753874>
                ACTL/<577.07,126.918,50.23>,<-0.0916386,0.8124672,0.5757599>
                MEAS/PLANE,4
                  HIT/BASIC,NORMAL,D=0.001,<604.163,151.389,76.691>,<667.044,121.747,71.85>,USE THEO=NO
                  HIT/BASIC,NORMAL,D=-0.001,<423.74,119.16,82.746>,<488.67,92.052,85.358>,USE THEO=NO
                  HIT/BASIC,NORMAL,D=0.001,<416.385,164.014,18.132>,<493.7,136.727,23.121>,USE THEO=NO
                  HIT/BASIC,NORMAL,D=-0.002,<592.606,191.365,18.033>,<658.867,157.146,20.59>,USE THEO=NO
                ENDMEAS/
                COMMENT/OPER,NO,FULL SCREEN=NO,AUTO-CONTINUE=NO,
                Take 6 point upper cylinder on jig
    CYL1       =FEAT/CYLINDER,CARTESIAN,IN,LEAST_SQR
                THEO/<546.287,-62.41,183.911>,<0.9876915,0.1563585,-0.0041885>,19.971,29.218
                ACTL/<601.58,-92.66,183.68>,<-0.9933056,-0.1154184,0.0047595>,25.974,30.984
                MEAS/CYLINDER,10
                  HIT/BASIC,NORMAL,<558.917,-50.658,186.483>,<617.742,-100.729,175.19>,USE THEO=NO
                  HIT/BASIC,NORMAL,<559.929,-58.641,193.709>,<618.428,-103.291,187.133>,USE THEO=NO
                  HIT/BASIC,NORMAL,<562.137,-68.982,188.245>,<616.007,-92.229,196.534>,USE THEO=NO
                  HIT/BASIC,NORMAL,<533.298,-73.683,188.071>,<613.963,-78.901,187.957>,USE THEO=NO
                  HIT/BASIC,NORMAL,<533.399,-65.693,193.879>,<615.08,-80.767,175.642>,USE THEO=NO
                  HIT/BASIC,NORMAL,<531.819,-55.156,187.25>,<585.015,-84.672,175.277>,USE THEO=NO
                  HIT/BASIC,NORMAL,<558.917,-50.658,186.483>,<585.753,-83.072,190.059>,USE THEO=NO
                  HIT/BASIC,NORMAL,<558.917,-50.658,186.483>,<588.836,-93.926,196.725>,USE THEO=NO
                  HIT/BASIC,NORMAL,<558.917,-50.658,186.483>,<589.422,-104.991,190.904>,USE THEO=NO
                  HIT/BASIC,NORMAL,<558.917,-50.658,186.483>,<588.693,-106.412,179.227>,USE THEO=NO
                ENDMEAS/
                COMMENT/OPER,NO,FULL SCREEN=NO,AUTO-CONTINUE=NO,
                Take four point plane on front of cyclinders
    PLN2       =FEAT/PLANE,CARTESIAN,TRIANGLE
                THEO/<574.76,-127.376,126.517>,<0.9872258,0.1592475,-0.0050448>
                ACTL/<628.717,-161.937,127.784>,<0.9932954,0.1155731,-0.0026697>
                MEAS/PLANE,4
                  HIT/BASIC,NORMAL,D=0,<564.092,-59.248,190.883>,<620.561,-90.345,192.206>,USE THEO=NO
                  HIT/BASIC,NORMAL,D=0,<563.753,-57.498,176.84>,<621.255,-96.602,179.847>,USE THEO=NO
                  HIT/BASIC,NORMAL,D=0,<585.805,-197.39,76.318>,<636.531,-230.257,77.155>,USE THEO=NO
                  HIT/BASIC,NORMAL,D=0,<585.39,-195.367,62.025>,<636.523,-230.545,61.929>,USE THEO=NO
                ENDMEAS/
    A1         =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
                  ALIGNMENT/LEVEL,ZPLUS,PLN1
                  ALIGNMENT/TRANS,ZAXIS,PLN1
                  ALIGNMENT/TRANS_OFFSET,ZAXIS,1.5
                  ALIGNMENT/LEVEL,YMINUS,PLN2
                  ALIGNMENT/TRANS,YAXIS,PLN2
                  ALIGNMENT/ROTATE,XMINUS,TO,PLN2,ABOUT,ZPLUS
                  ALIGNMENT/ROTATE_OFFSET,90,ABOUT,ZPLUS
                  ALIGNMENT/TRANS,XAXIS,CYL1
                ALIGNMENT/END

  • #2
    Your alignment contains way too many things.
    1 Level, 1 Rotate, 3 Origins is all you need.
    Level ZPlus to PLN1, Rotate XMinus to PLN2 About ZPLUS, ROTATE_OFFSET (if necessary), TRANS ZAXIS to PLN1, TRANS YAXIS to PLN2, TRANS XAXIS to CYL1

    Comment


    • #3
      Surely I need to set my y axis though?

      Comment


      • InspectorJester
        InspectorJester commented
        Editing a comment
        If you level Z. and rotate to X about Z, then origin your three axes, look at the trihedron.
        If it does not move while you are editing the alignment, you are set.
        Because you Level Z and rotate X, Y is also constrained.

        EDIT:
        I have a rotary table, facing Y-. All of my parts are cylindrical.
        I level YPlus to the cylinder, take a plane in a cut, which I use for rotation. I set X & Z to the cylinder, and I take another plane on the face of the cylinder, which I use to set Y.
        1 Level, 1 Rotate, 3 Origins, and the part is aligned well enough, because, as I understand, a level is also a rotation in some aspect. So I'm rotating Z, I'm rotating X, that must mean Y is also rotated
        Last edited by InspectorJester; 04-16-2019, 08:57 AM.

    • #4
      Originally posted by alexk View Post
      Surely I need to set my y axis though?
      The axes are not independent - they all sit at the origin, perpendicular to each other. One level (2 dof), one rotate (1 dof) and three coordinates (3 dof) locks all 6 degrees of freedom (dof). The only extra would be any offsets (rotation and/or translation).
      AndersI
      SW support - Hexagon Metrology Nordic AB

      Comment

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