DO/UNTIL Y-Axis Loop Issue

I've been successfully running multiple parts in a fixture using a DO/UNTIL loop and moving the origin in the X-axis. We have a family of parts that, due to our small CMM/part size/tip angles, need to be looped moving the origin in the Y-axis. Whenever I do this, the first station gets skipped, the second station runs twice in a row, and stations 3/4/5 run as they should. Code is below, A1 is my manual alignment

A1         =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
              ALIGNMENT/LEVEL,XPLUS,CYL1
              ALIGNMENT/TRANS,YAXIS,CYL1
              ALIGNMENT/TRANS,ZAXIS,CYL1
              ALIGNMENT/TRANS,XAXIS,PNT1
              ALIGNMENT/ROTATE,YMINUS,TO,LIN1,ABOUT,XPLUS
            ALIGNMENT/ENDASSIGN/COUNTER=0
SKIP_ALIGN =LABEL/
            WORKPLANE/ZPLUS
            MODE/DCC
            FLY/ON
            PREHIT/1
            RETRACT/1
            ASSIGN/COUNTER=0
            DO/
            ASSIGN/COUNTER=COUNTER+1
            IF/COUNTER==5
              ASSIGN/FIXTURE_X=0
              ASSIGN/FIXTURE_Y=304.8
            END_IF/
            IF/COUNTER==4
              ASSIGN/FIXTURE_X=0
              ASSIGN/FIXTURE_Y=228.6
            END_IF/
            IF/COUNTER==3
              ASSIGN/FIXTURE_X=0
              ASSIGN/FIXTURE_Y=152.4
            END_IF/
            IF/COUNTER==2
              ASSIGN/FIXTURE_X=0
              ASSIGN/FIXTURE_Y=76.2
            END_IF/
            IF/COUNTER==1
              ASSIGN/FIXTURE_X=0
              ASSIGN/FIXUTRE_Y=0
            GOTO/ORIGIN
            END_IF/
ORIGIN     =LABEL/
LOOP_ORIGIN=GENERIC/POINT,DEPENDENT,CARTESIAN,$
            NOM/XYZ,<0+0,0+0,0+0>,$
            MEAS/XYZ,<FIXTURE_X,FIXTURE_Y,0+0>,$
            NOM/IJK,<0+0,0+0,1+0>,$
            MEAS/IJK,<0+0,0+0,1+0>
A4         =ALIGNMENT/START,RECALL:A1,LIST=YES
              ALIGNMENT/TRANS,XAXIS,LOOP_ORIGIN
              ALIGNMENT/TRANS,YAXIS,LOOP_ORIGIN
            ALIGNMENT/END

Parents

JEFMAN over 2 years ago

I would try something like this :

A1 =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
ALIGNMENT/LEVEL,XPLUS,CYL1
ALIGNMENT/TRANS,YAXIS,CYL1
ALIGNMENT/TRANS,ZAXIS,CYL1
ALIGNMENT/TRANS,XAXIS,PNT1
ALIGNMENT/ROTATE,YMINUS,TO,LIN1,ABOUT,XPLUS
ALIGNMENT/ENDASSIGN/COUNTER=0
SKIP_ALIGN =LABEL/
WORKPLANE/ZPLUS
MODE/DCC
FLY/ON
PREHIT/1
RETRACT/1
ASSIGN/ZERO=0
ASSIGN/ONE=1
ASSIGN/COUNTER=1
ASSIGN/DY=76.2
DO/
ASSIGN/FIXTURE_Y=DY*(COUNTER-1)
A4 =ALIGNMENT/START,RECALL:A1,LIST=YES
ALIGNMENT/TRANS,YAXIS,CYL1
ALIGNMENT/TRANS_OFFSET,YAXIS,FIXTURE_Y
ALIGNMENT/END
(.....)
ASSIGN/COUNTER=COUNTER+1
UNTIL/COUNTER==6

Reply

JEFMAN over 2 years ago

I would try something like this :

A1 =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
ALIGNMENT/LEVEL,XPLUS,CYL1
ALIGNMENT/TRANS,YAXIS,CYL1
ALIGNMENT/TRANS,ZAXIS,CYL1
ALIGNMENT/TRANS,XAXIS,PNT1
ALIGNMENT/ROTATE,YMINUS,TO,LIN1,ABOUT,XPLUS
ALIGNMENT/ENDASSIGN/COUNTER=0
SKIP_ALIGN =LABEL/
WORKPLANE/ZPLUS
MODE/DCC
FLY/ON
PREHIT/1
RETRACT/1
ASSIGN/ZERO=0
ASSIGN/ONE=1
ASSIGN/COUNTER=1
ASSIGN/DY=76.2
DO/
ASSIGN/FIXTURE_Y=DY*(COUNTER-1)
A4 =ALIGNMENT/START,RECALL:A1,LIST=YES
ALIGNMENT/TRANS,YAXIS,CYL1
ALIGNMENT/TRANS_OFFSET,YAXIS,FIXTURE_Y
ALIGNMENT/END
(.....)
ASSIGN/COUNTER=COUNTER+1
UNTIL/COUNTER==6

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