Measured Circles Not Adding Up

I'm measuring five circles that are equally spaced on the OD of a circular part. The first hole is directly in front of the operator and they're programmed counterclockwise. All holes are verified at .344 with pin gauges but the CMM is giving me very out-of-whack measurements. I adjusted the workplanes to be correct to the best of my knowledge (closest to nominal) but some are still very far from their actual size. This is my first program in which i've had to change work planes so I wouldn't be surprised if this is the issue.

Code is below (added spaces for readability):

344_HOLE1 =FEAT/CIRCLE,CARTESIAN,OUT,MAX_INSC
THEO/<-0.7183369,-3.5143077,-1.381342>,<0,1,0>,0.344,0
ACTL/<-0.7178798,-3.5143077,-1.385474>,<0,1,0>,0.344,0
MEAS/CIRCLE,4,YPLUS
HIT/BASIC,NORMAL,<-0.7103287,-3.5148667,-1.2155979>,<-0.0356289,0,-0.9993651>,<-0.7101988,-3.5148525,-1.212487>,USE THEO=YES
HIT/BASIC,NORMAL,<-0.5526817,-3.5492789,-1.3716656>,<-0.9990609,0,-0.0433286>,<-0.5502341,-3.5492667,-1.3715646>,USE THEO=YES
HIT/BASIC,NORMAL,<-0.7060546,-3.5158762,-1.5549542>,<-0.052764,0,0.998607>,<-0.7058733,-3.5158573,-1.5582219>,USE THEO=YES
HIT/BASIC,NORMAL,<-0.8833191,-3.4772092,-1.3991301>,<0.9968191,0,0.0796972>,<-0.8853819,-3.4772446,-1.3993159>,USE THEO=YES
ENDMEAS/

MOVE/POINT,NORMAL,<-0.9676974,-4.7180066,-1.3989668>
MOVE/POINT,NORMAL,<-6.4657259,-3.6309786,-1.3992647>
MOVE/POINT,NORMAL,<-9.4230871,2.3708429,-1.4008968>
TIP/T1A90B112.5, SHANKIJK=-0.9805587, -0.196226, 0.0000453, ANGLE=90.0156981
MOVE/POINT,NORMAL,<-3.9155209,-0.4605506,-1.3954787>
MOVE/POINT,NORMAL,<-3.5081882,-0.3869483,-1.3955216>

344_HOLE2 =FEAT/CIRCLE,CARTESIAN,IN,MAX_INSC
THEO/<-3.5071807,-0.3982196,-1.3894409>,<1,0,0>,0.344
ACTL/<-3.5071678,-0.3980942,-1.388663>,<1,0,0>,0.3395547
MEAS/CIRCLE,4,XPLUS
HIT/BASIC,NORMAL,<-3.5081999,-0.3866928,-1.2178287>,<0,-0.1015572,-0.9948297>,<-3.5081746,-0.3900225,-1.2190776>,USE THEO=YES
HIT/BASIC,NORMAL,<-3.5373156,-0.2265796,-1.3783336>,<0,-0.9952551,-0.0973002>,<-3.5373115,-0.2284514,-1.3819047>,USE THEO=YES
HIT/BASIC,NORMAL,<-3.5084603,-0.3852459,-1.5612771>,<0,-0.1142003,0.9934577>,<-3.508443,-0.3892177,-1.559178>,USE THEO=YES
HIT/BASIC,NORMAL,<-3.4747469,-0.5698369,-1.400891>,<0,0.9949583,0.1002892>,<-3.4747421,-0.5676155,-1.3979843>,USE THEO=YES
ENDMEAS/

MOVE/POINT,NORMAL,<-4.5113759,-0.5996543,-1.338755>
MOVE/POINT,NORMAL,<-2.047029,11.8648987,-1.3420459>
TIP/T1A90B37.5, SHANKIJK=-0.443327, 0.8963599, -0.0002442, ANGLE=90.0347213
MOVE/POINT,NORMAL,<-1.599236,3.5716813,-1.3665804>
MOVE/POINT,NORMAL,<-1.4721558,3.2090077,-1.3664355>

344_HOLE3 =FEAT/CIRCLE,CARTESIAN,OUT,MAX_INSC
THEO/<-1.4628752,3.214092,-1.3618156>,<0,-1,0>,0.344,0
ACTL/<-1.4614916,3.214092,-1.3887764>,<0,-1,0>,0.344,0
MEAS/CIRCLE,4,YMINUS
HIT/BASIC,NORMAL,<-1.4721695,3.2091029,-1.0326075>,<0.0000144,-0.0002531,-1>,<-1.4721669,3.2090565,-1.215838>,USE THEO=YES
HIT/BASIC,NORMAL,<-1.7828832,3.0613429,-1.3750947>,<0.9032231,0.4291713,-0.0000956>,<-1.6173852,3.1399801,-1.3751123>,USE THEO=YES
HIT/BASIC,NORMAL,<-1.4732829,3.2084071,-1.7443597>,<-0.0000144,0.0002531,1>,<-1.4732855,3.2084534,-1.5611292>,USE THEO=YES
HIT/BASIC,NORMAL,<-1.1403696,3.3666173,-1.4022971>,<-0.9032231,-0.4291713,0.0000956>,<-1.3058676,3.28798,-1.4022796>,USE THEO=YES
ENDMEAS/

MOVE/POINT,NORMAL,<-2.6529419,5.65626,-1.3894248>
MOVE/POINT,NORMAL,<10.7759628,2.9792583,-1.3886147>
TIP/T1A90B-37.5, SHANKIJK=0.7510758, 0.660216, -0.0001717, ANGLE=-90.0204945
MOVE/POINT,NORMAL,<2.8569419,2.6739147,-1.3885816>
MOVE/POINT,NORMAL,<2.5145009,2.312614,-1.3884901>

344_HOLE4 =FEAT/CIRCLE,CARTESIAN,IN,LEAST_SQR
THEO/<2.5202351,2.3092623,-1.375188>,<0,-1,0>,0.344
ACTL/<2.521155,2.304221,-1.3877466>,<0,-1,0>,0.3068571
MEAS/CIRCLE,4,YMINUS
HIT/BASIC,NORMAL,<2.5144953,2.3126509,-1.2151597>,<0.0000144,-0.0002531,-1>,<2.5110761,2.312655,-1.2151991>,USE THEO=YES
HIT/BASIC,NORMAL,<2.6331171,2.1733997,-1.3743442>,<-0.6483192,0.7613686,-0.000202>,<2.6528612,2.2181039,-1.3638618>,USE THEO=YES
HIT/BASIC,NORMAL,<2.5294581,2.295011,-1.5602992>,<-0.0000144,0.0002531,1>,<2.5337557,2.295033,-1.5601759>,USE THEO=YES
HIT/BASIC,NORMAL,<2.4091574,2.435743,-1.4014749>,<0.6483192,-0.7613686,0.000202>,<2.3892786,2.3910921,-1.412226>,USE THEO=YES
ENDMEAS/

MOVE/POINT,NORMAL,<5.8435965,5.2417641,-1.3896611>
MOVE/POINT,NORMAL,<2.6800456,-12.0805492,-1.3651083>
TIP/T1A90B-112.5, SHANKIJK=0.8321124, -0.554607, 0.0001553, ANGLE=-90.0184986
MOVE/POINT,NORMAL,<3.5701926,-2.0449822,-1.3677719>
MOVE/POINT,NORMAL,<3.0035167,-1.7170904,-1.3678607>

344_HOLE5 =FEAT/CIRCLE,CARTESIAN,IN,MAX_INSC
THEO/<3.0110685,-1.7076715,-1.3566277>,<1,0,0>,0.344
ACTL/<3.0110685,-1.7078089,-1.3662898>,<1,0,0>,0.344
MEAS/CIRCLE,4,XPLUS
HIT/BASIC,NORMAL,<3.0035061,-1.7203619,-1.1851226>,<0,0.112069,-0.9937004>,<3.0034938,-1.7170671,-1.2140308>,USE THEO=YES
HIT/BASIC,NORMAL,<3.107632,-1.5371386,-1.3787035>,<0,-0.9840581,0.1778473>,<3.1076603,-1.5776822,-1.3714686>,USE THEO=YES
HIT/BASIC,NORMAL,<3.0169896,-1.6955638,-1.5884304>,<0,-0.0699198,0.9975526>,<3.0169749,-1.6976557,-1.5595376>,USE THEO=YES
HIT/BASIC,NORMAL,<2.9161464,-1.8697314,-1.4134059>,<0,0.894476,0.447116>,<2.9161292,-1.8256999,-1.3916365>,USE THEO=YES
ENDMEAS/

MOVE/POINT,NORMAL,<3.7421052,-2.1865275,-1.3919337>
DIM 57_344DIA_HOLE1= LOCATION OF CIRCLE 344_HOLE1 UNITS=IN ,$
GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH HALF ANGLE=NO
AX NOMINAL +TOL -TOL MAX MIN DEV OUTTOL MEAS
D 0.3440000 0.0060000 0.0010000 0.3379373 0.3379373 0.0000000 0.0000000 0.3440000 -#-------
END OF DIMENSION 57_344DIA_HOLE1

DIM 57_344DIA_HOLE2= LOCATION OF CIRCLE 344_HOLE2 UNITS=IN ,$
GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH HALF ANGLE=NO
AX NOMINAL +TOL -TOL MAX MIN DEV OUTTOL MEAS
D 0.3440000 0.0060000 0.0010000 0.3414918 0.3395547 -0.0044453 0.0034453 0.3395547 <--------
END OF DIMENSION 57_344DIA_HOLE2

DIM 57_344DIA_HOLE3= LOCATION OF CIRCLE 344_HOLE3 UNITS=IN ,$
GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH HALF ANGLE=NO
AX NOMINAL +TOL -TOL MAX MIN DEV OUTTOL MEAS
D 0.3440000 0.0060000 0.0010000 0.7104610 0.7104610 0.0000000 0.0000000 0.3440000 -#-------
END OF DIMENSION 57_344DIA_HOLE3

DIM 57_344DIA_HOLE4= LOCATION OF CIRCLE 344_HOLE4 UNITS=IN ,$
GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH HALF ANGLE=NO
AX NOMINAL +TOL -TOL MAX MIN DEV OUTTOL MEAS
D 0.3440000 0.0060000 0.0010000 0.3457781 0.2677088 -0.0371429 0.0361429 0.3068571 <--------
END OF DIMENSION 57_344DIA_HOLE4

DIM 57_344DIA_HOLE5= LOCATION OF CIRCLE 344_HOLE5 UNITS=IN ,$
GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH HALF ANGLE=NO
AX NOMINAL +TOL -TOL MAX MIN DEV OUTTOL MEAS
D 0.3440000 0.0060000 0.0010000 0.2854986 0.2854986 0.0000000 0.0000000 0.3440000 -#-------
END OF DIMENSION 57_344DIA_HOLE5

Some of the dimensions have Max & Mins that are all over the place as well. Anyone have any insight on this?

Parents

KBPCDMIS over 1 year ago

Hello.

The first thing I noticed is that the first circle is [...]OUT,MAX_INSC, the second is [...]IN,MAX_INSC and the fourth is [...]IN,LEAST_SQR.

I doubt that will work if it's all holes.

It is best to use an auto-circle, rewrite these 5 holes with the correct coordinates and set them all to "INNER" and "LEAST_SQR" if this is not already set

Re-wrote with auto-circles and I'm getting much more accurate measurements. Thank you again! Here's the new code in case you see any other mistakes/areas for improvement:

344HOLE1 =FEAT/CONTACT/CIRCLE/DEFAULT,CARTESIAN,IN,LEAST_SQR
THEO/<-0.7102,-3.514,-1.39>,<-0.2093628,-0.977838,0.0002445>,0.344
ACTL/<-0.7174165,-3.5124537,-1.3854151>,<-0.2093628,-0.977838,0.0002445>,0.3462104
TARG/<-0.7102,-3.514,-1.39>,<-0.2093628,-0.977838,0.0002445>
START ANG=0,END ANG=360
ANGLE VEC=<0.9799247,-0.1993679,0>
DIRECTION=CCW
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
NUMHITS=4,DEPTH=0,PITCH=0
SAMPLE METHOD=SAMPLE_HITS
SAMPLE HITS=0,SPACER=0
AVOIDANCE MOVE=NO,DISTANCE=0.393701
FIND HOLE=DISABLED,ONERROR=NO,READ POS=NO
SHOW HITS=NO

MOVE/POINT,NORMAL,<-1.1148492,-5.4039741,-1.4026886>
MOVE/POINT,NORMAL,<-9.3989191,-3.6302896,-1.4032452>
TIP/T1A90B112.5, SHANKIJK=-0.9835242, -0.1807764, 0.0000316, ANGLE=90.0147443
MOVE/POINT,NORMAL,<-4.03826,-0.4361531,-1.4061009>

344HOLE2 =FEAT/CONTACT/CIRCLE/DEFAULT,CARTESIAN,IN,LEAST_SQR
THEO/<-3.47,-0.37,-1.39>,<-0.9835242,-0.1807764,0.0000316>,0.344
ACTL/<-3.4655912,-0.3939868,-1.3920549>,<-0.9835242,-0.1807764,0.0000316>,0.34578
TARG/<-3.47,-0.37,-1.39>,<-0.9835242,-0.1807764,0.0000316>
START ANG=0,END ANG=360
ANGLE VEC=<0.9799247,-0.1993679,0>
DIRECTION=CCW
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
NUMHITS=4,DEPTH=0,PITCH=0
SAMPLE METHOD=SAMPLE_HITS
SAMPLE HITS=0,SPACER=0
AVOIDANCE MOVE=NO,DISTANCE=0.393701
FIND HOLE=DISABLED,ONERROR=NO,READ POS=NO
SHOW HITS=NO

MOVE/POINT,NORMAL,<-5.035872,-0.6573285,-1.4031111>
MOVE/POINT,NORMAL,<-2.4260273,11.3939142,-1.4061404>
TIP/T1A90B37.5, SHANKIJK=-0.4291714, 0.903223, -0.0002348, ANGLE=90.0337892
MOVE/POINT,NORMAL,<-1.6230981,3.6697638,-1.4106032>
MOVE/POINT,NORMAL,<-1.3900387,3.0939898,-1.4025931>

344HOLE3 =FEAT/CONTACT/CIRCLE/DEFAULT,CARTESIAN,IN,LEAST_SQR
THEO/<-1.39,3.093,-1.39>,<-0.4291714,0.903223,-0.0002348>,0.344
ACTL/<-1.4036591,3.0865101,-1.3887019>,<-0.4291714,0.903223,-0.0002348>,0.3458874
TARG/<-1.39,3.093,-1.39>,<-0.4291714,0.903223,-0.0002348>
START ANG=0,END ANG=360
ANGLE VEC=<0.9799247,-0.1993679,0>
DIRECTION=CCW
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
NUMHITS=4,DEPTH=0,PITCH=0
SAMPLE METHOD=SAMPLE_HITS
SAMPLE HITS=0,SPACER=0
AVOIDANCE MOVE=NO,DISTANCE=0.393701
FIND HOLE=DISABLED,ONERROR=NO,READ POS=NO
SHOW HITS=NO

MOVE/POINT,NORMAL,<-2.3161387,5.0421381,-1.3773532>
MOVE/POINT,NORMAL,<11.4998503,2.0840056,-1.3764076>
TIP/T1A90B-37.5, SHANKIJK=0.7613687, 0.6483191, -0.0001531, ANGLE=-90.0190465
MOVE/POINT,NORMAL,<2.9745958,2.6657906,-1.3759689>
MOVE/POINT,NORMAL,<2.4316533,2.2035069,-1.3758593>

344HOLE4 =FEAT/CONTACT/CIRCLE/DEFAULT,CARTESIAN,IN,LEAST_SQR
THEO/<2.4316525,2.2034953,-1.39>,<0.7613687,0.6483191,-0.0001531>,0.344
ACTL/<2.4226295,2.2140922,-1.3880279>,<0.7613687,0.6483191,-0.0001531>,0.3461146
TARG/<2.4316525,2.2034953,-1.39>,<0.7613687,0.6483191,-0.0001531>
START ANG=0,END ANG=360
ANGLE VEC=<0.9799247,-0.1993679,0>
DIRECTION=CCW
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
NUMHITS=4,DEPTH=0,PITCH=0
SAMPLE METHOD=SAMPLE_HITS
SAMPLE HITS=0,SPACER=0
AVOIDANCE MOVE=NO,DISTANCE=0.393701
FIND HOLE=DISABLED,ONERROR=NO,READ POS=NO
SHOW HITS=NO

MOVE/POINT,NORMAL,<3.6403723,3.2327218,-1.3770831>
MOVE/POINT,NORMAL,<6.8214331,-0.5032404,-1.2993304>
MOVE/POINT,NORMAL,<4.1945167,-10.6803312,-1.2959729>
TIP/T1A90B-112.5, SHANKIJK=0.8232849, -0.5676284, 0.0001555, ANGLE=-90.017614
MOVE/POINT,NORMAL,<3.4990194,-1.9164197,-1.4084241>
MOVE/POINT,NORMAL,<3.0660348,-1.7113153,-1.4084855>

344HOLE5 =FEAT/CONTACT/CIRCLE/DEFAULT,CARTESIAN,IN,LEAST_SQR
THEO/<3.0660298,-1.7113382,-1.39>,<0.8232849,-0.5676284,0.0001555>,0.344
ACTL/<3.0525779,-1.730848,-1.386912>,<0.8232849,-0.5676284,0.0001555>,0.3439003
TARG/<3.0660298,-1.7113382,-1.39>,<0.8232849,-0.5676284,0.0001555>
START ANG=0,END ANG=360
ANGLE VEC=<0.9799247,-0.1993679,0>
DIRECTION=CCW
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
NUMHITS=4,DEPTH=0,PITCH=0
SAMPLE METHOD=SAMPLE_HITS
SAMPLE HITS=0,SPACER=0
AVOIDANCE MOVE=NO,DISTANCE=0.393701
FIND HOLE=DISABLED,ONERROR=NO,READ POS=NO
SHOW HITS=NO

MOVE/POINT,NORMAL,<4.5919466,-2.7623339,-1.4028744>

DIM 55_344HOLEDIA_1= LOCATION OF CIRCLE 344HOLE1 UNITS=IN ,$
GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH HALF ANGLE=NO
AX NOMINAL +TOL -TOL MAX MIN DEV OUTTOL MEAS
D 0.3440000 0.0060000 0.0010000 0.3463706 0.3460537 0.0022104 0.0000000 0.3462104 ----#----
END OF DIMENSION 55_344HOLEDIA_1

DIM 55_344HOLEDIA_2= LOCATION OF CIRCLE 344HOLE2 UNITS=IN ,$
GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH HALF ANGLE=NO
AX NOMINAL +TOL -TOL MAX MIN DEV OUTTOL MEAS
D 0.3440000 0.0060000 0.0010000 0.3468078 0.3449185 0.0017800 0.0000000 0.3457800 ---#-----
END OF DIMENSION 55_344HOLEDIA_2

DIM 55_344HOLEDIA_3= LOCATION OF CIRCLE 344HOLE3 UNITS=IN ,$
GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH HALF ANGLE=NO
AX NOMINAL +TOL -TOL MAX MIN DEV OUTTOL MEAS
D 0.3440000 0.0060000 0.0010000 0.3462805 0.3455365 0.0018874 0.0000000 0.3458874 ---#-----
END OF DIMENSION 55_344HOLEDIA_3

DIM 55_344HOLEDIA_4= LOCATION OF CIRCLE 344HOLE4 UNITS=IN ,$
GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH HALF ANGLE=NO
AX NOMINAL +TOL -TOL MAX MIN DEV OUTTOL MEAS
D 0.3440000 0.0060000 0.0010000 0.3464141 0.3458431 0.0021146 0.0000000 0.3461146 ----#----
END OF DIMENSION 55_344HOLEDIA_4

DIM 55_344HOLEDIA_5= LOCATION OF CIRCLE 344HOLE5 UNITS=IN ,$
GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH HALF ANGLE=NO
AX NOMINAL +TOL -TOL MAX MIN DEV OUTTOL MEAS
D 0.3440000 0.0060000 0.0010000 0.3450358 0.3425657 -0.0000997 0.0000000 0.3439003 -#-------
END OF DIMENSION 55_344HOLEDIA_5
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UKCMM over 1 year ago in reply to KBPCDMIS

Something else the angle vectors look wrong they should not be the same direction as surface vector some of those shown are very close.
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UKCMM over 1 year ago in reply to KBPCDMIS

Something else the angle vectors look wrong they should not be the same direction as surface vector some of those shown are very close.
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