problem with fixture plate

Hello everybody

So we have this fixture plate on our cmm with some pins on it.
and all parts we measure are put in a fixture and slided against the pins, so no manual alignment requierment.

problem is that every year when hex comes to calibrate our CMM, he has to take off the fixtureplate
and when he puts it on again, the plate is in a slight different position.

This kinda screws up for alot of our parts because we have to run the manual alignment again.

Has anyone any idea for either
1. A good setup for the plate so its precicily in the same position everytime we remove it and put i back. (Currenctly we put it with 3 bolts in the graphite plate)

or
2. Work with a zero point system so that we align on our fixture plate and all other manual alignments are based on that. so if we remove /put back our fixture plate all we have to do is do a 3/2/1 alignment on fixtureplate. (instead of running manual alignment on every part)

ty guys!

Parents

Neil Challinor over 1 year ago

The correct procedure should be to create a routine that aligns your fixture plate and saves the alignment externally. Then, in all of your other routines, you would start by recalling the external fixture alignment. Whenever the fixture plate gets moved, you simply re-run the fixture alignment routine.

Example FIxture Alignment Routine Code...

PLN1         =FEAT/PLANE,CARTESIAN,TRIANGLE
              THEO/<50.298,37.095,0>,<0,0,1>
              ACTL/<50.298,37.095,0>,<0,0,1>
              MEAS/PLANE,3
                HIT/BASIC,NORMAL,<20.398,51.307,0>,<0,0,1>,<20.398,51.307,0>,USE THEO=YES
                HIT/BASIC,NORMAL,<65.04,50.715,0>,<0,0,1>,<65.04,50.715,0>,USE THEO=YES
                HIT/BASIC,NORMAL,<65.456,9.262,0>,<0,0,1>,<65.456,9.262,0>,USE THEO=YES
              ENDMEAS/
A1           =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
                ALIGNMENT/LEVEL,ZPLUS,PLN1
                ALIGNMENT/TRANS,ZAXIS,PLN1
              ALIGNMENT/END
LIN1         =FEAT/LINE,CARTESIAN,UNBOUNDED
              THEO/<29.084,0,-2.117>,<1,0,0>
              ACTL/<29.084,0,-2.117>,<1,0,0>
              MEAS/LINE,2,ZPLUS
                HIT/BASIC,NORMAL,<29.084,0,-2.672>,<0,-1,0>,<29.084,0,-2.672>,USE THEO=YES
                HIT/BASIC,NORMAL,<71.956,0,-1.563>,<0,-1,0>,<71.956,0,-1.563>,USE THEO=YES
              ENDMEAS/
A2           =ALIGNMENT/START,RECALL:A1,LIST=YES
                ALIGNMENT/LEVEL,ZPLUS,PLN1
                ALIGNMENT/TRANS,ZAXIS,PLN1
                ALIGNMENT/ROTATE,XPLUS,TO,LIN1,ABOUT,ZPLUS
                ALIGNMENT/TRANS,YAXIS,LIN1
              ALIGNMENT/END
PNT1         =FEAT/POINT,CARTESIAN
              THEO/<0,6.726,-4.011>,<-1,0,0>
              ACTL/<0,6.726,-4.011>,<-1,0,0>
              MEAS/POINT,1,WORKPLANE
                HIT/BASIC,NORMAL,<0,6.726,-4.011>,<-1,0,0>,<0,6.726,-4.011>,USE THEO=YES
              ENDMEAS/
A3           =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
                ALIGNMENT/LEVEL,ZPLUS,PLN1
                ALIGNMENT/TRANS,ZAXIS,PLN1
                ALIGNMENT/ROTATE,XPLUS,TO,LIN1,ABOUT,ZPLUS
                ALIGNMENT/TRANS,YAXIS,LIN1
                ALIGNMENT/TRANS,XAXIS,PNT1
              ALIGNMENT/END
              SAVE/ALIGNMENT,Fixture_alignment.aln,MACHINETOPARTS

Example of how to recall the fixture alignment in your other routines...

PART NAME  : test
REV NUMBER :
SER NUMBER :
STATS COUNT : 1
 
STARTUP    =ALIGNMENT/START,RECALL:USE_PART_SETUP,LIST=YES
            ALIGNMENT/END
            MODE/MANUAL
            FORMAT/TEXT,OPTIONS, ,HEADINGS,SYMBOLS, ;NOM,TOL,MEAS,DEV,OUTTOL, ,
            LOADPROBE/LSPX1_3X50
            TIP/T1A0B0, SHANKIJK=0, 0, 1, ANGLE=0
            RECALL/ALIGNMENT,EXTERNAL,FIXTURE_ALIGNMENT

rest of routine

Reply

Neil Challinor over 1 year ago

PLN1         =FEAT/PLANE,CARTESIAN,TRIANGLE
              THEO/<50.298,37.095,0>,<0,0,1>
              ACTL/<50.298,37.095,0>,<0,0,1>
              MEAS/PLANE,3
                HIT/BASIC,NORMAL,<20.398,51.307,0>,<0,0,1>,<20.398,51.307,0>,USE THEO=YES
                HIT/BASIC,NORMAL,<65.04,50.715,0>,<0,0,1>,<65.04,50.715,0>,USE THEO=YES
                HIT/BASIC,NORMAL,<65.456,9.262,0>,<0,0,1>,<65.456,9.262,0>,USE THEO=YES
              ENDMEAS/
A1           =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
                ALIGNMENT/LEVEL,ZPLUS,PLN1
                ALIGNMENT/TRANS,ZAXIS,PLN1
              ALIGNMENT/END
LIN1         =FEAT/LINE,CARTESIAN,UNBOUNDED
              THEO/<29.084,0,-2.117>,<1,0,0>
              ACTL/<29.084,0,-2.117>,<1,0,0>
              MEAS/LINE,2,ZPLUS
                HIT/BASIC,NORMAL,<29.084,0,-2.672>,<0,-1,0>,<29.084,0,-2.672>,USE THEO=YES
                HIT/BASIC,NORMAL,<71.956,0,-1.563>,<0,-1,0>,<71.956,0,-1.563>,USE THEO=YES
              ENDMEAS/
A2           =ALIGNMENT/START,RECALL:A1,LIST=YES
                ALIGNMENT/LEVEL,ZPLUS,PLN1
                ALIGNMENT/TRANS,ZAXIS,PLN1
                ALIGNMENT/ROTATE,XPLUS,TO,LIN1,ABOUT,ZPLUS
                ALIGNMENT/TRANS,YAXIS,LIN1
              ALIGNMENT/END
PNT1         =FEAT/POINT,CARTESIAN
              THEO/<0,6.726,-4.011>,<-1,0,0>
              ACTL/<0,6.726,-4.011>,<-1,0,0>
              MEAS/POINT,1,WORKPLANE
                HIT/BASIC,NORMAL,<0,6.726,-4.011>,<-1,0,0>,<0,6.726,-4.011>,USE THEO=YES
              ENDMEAS/
A3           =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
                ALIGNMENT/LEVEL,ZPLUS,PLN1
                ALIGNMENT/TRANS,ZAXIS,PLN1
                ALIGNMENT/ROTATE,XPLUS,TO,LIN1,ABOUT,ZPLUS
                ALIGNMENT/TRANS,YAXIS,LIN1
                ALIGNMENT/TRANS,XAXIS,PNT1
              ALIGNMENT/END
              SAVE/ALIGNMENT,Fixture_alignment.aln,MACHINETOPARTS

Example of how to recall the fixture alignment in your other routines...

PART NAME  : test
REV NUMBER :
SER NUMBER :
STATS COUNT : 1
 
STARTUP    =ALIGNMENT/START,RECALL:USE_PART_SETUP,LIST=YES
            ALIGNMENT/END
            MODE/MANUAL
            FORMAT/TEXT,OPTIONS, ,HEADINGS,SYMBOLS, ;NOM,TOL,MEAS,DEV,OUTTOL, ,
            LOADPROBE/LSPX1_3X50
            TIP/T1A0B0, SHANKIJK=0, 0, 1, ANGLE=0
            RECALL/ALIGNMENT,EXTERNAL,FIXTURE_ALIGNMENT

rest of routine

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