Nominals changing

[Ken379128]

Why when I run thru a program do my nominals keep changing. I go in put them to what I want and when it runs it changes it right back????
Global Image 3.7 MR2

C1 =COMMENT/YESNO,NO,Would you like to do a manual Alignment?
COMMENT/OPER,NO,For the Alignment use 4 hit on the v-block at
,each corner. 2 hits on the front edge running
,left to right. and 2 hits on the right side of the
,v-block front to back make sure to take the
,hits on the right side high enough to not hit
,the shank on the probe.
IF/C1.INPUT == "YES"
PLN1 =FEAT/PLANE,RECT,TRIANGLE
THEO/376.005,101.596,-436.656,-0.0002176,0.0045756,0.9999895
ACTL/374.085,101.166,-436.98,0.0000492,0.0092878,0.9999569
MEAS/PLANE,4
HIT/BASIC,NORMAL,317.138,77.106,-436.416,-0.0002176,0.0045756,0.9999895,312.702,75.689,-436.886,USE THEO = YES
HIT/BASIC,NORMAL,434.863,77.118,-436.672,-0.0002176,0.0045756,0.9999895,436.146,75.7,-436.602,USE THEO = YES
HIT/BASIC,NORMAL,434.862,126.085,-436.615,-0.0002176,0.0045756,0.9999895,436.147,126.643,-437.363,USE THEO = YES
HIT/BASIC,NORMAL,317.157,126.074,-436.921,-0.0002176,0.0045756,0.9999895,311.346,126.632,-437.071,USE THEO = YES
ENDMEAS/
LIN1 =FEAT/LINE,RECT,UNBND
THEO/317.157,71.893,-439.134,0.9999868,-0.0051356,0
ACTL/312.355,71.992,-440.37,0.9999767,-0.0068191,0
MEAS/LINE,2,WORKPLANE
HIT/BASIC,NORMAL,317.157,71.893,-439.134,-0.0051356,-0.9999868,0,312.355,71.992,-440.37,USE THEO = YES
HIT/BASIC,NORMAL,438.159,71.271,-439.137,-0.0051356,-0.9999868,0,438.116,71.135,-440.375,USE THEO = YES
ENDMEAS/
LIN2 =FEAT/LINE,RECT,UNBND
THEO/441.808,77.569,-439.143,0.0119318,0.9999288,0
ACTL/441.171,77.319,-440.375,0.0118097,0.9999303,0
MEAS/LINE,2,WORKPLANE
HIT/BASIC,NORMAL,441.808,77.569,-439.143,0.9999288,-0.0119318,0,441.171,77.319,-440.375,USE THEO = YES
HIT/BASIC,NORMAL,442.354,123.302,-439.143,0.9999288,-0.0119318,0,441.763,127.457,-440.375,USE THEO = YES
ENDMEAS/
PNT1 =FEAT/POINT,RECT
THEO/441.733,71.253,-439.138,0.9999868,-0.0051356,0
ACTL/441.098,71.114,-440.373,0.9999767,-0.0068191,0
CONSTR/POINT,INT,LIN1,LIN2
A1 =ALIGNMENT/START,RECALL:STARTUP, LIST= YES
ALIGNMENT/LEVEL,ZPLUS,PLN1
ALIGNMENT/ROTATE,XPLUS,TO,LIN1,ABOUT,ZPLUS
ALIGNMENT/TRANS,XAXIS,PNT1
ALIGNMENT/TRANS,YAXIS,PNT1
ALIGNMENT/TRANS,ZAXIS,PLN1
ALIGNMENT/END
MOVE/POINT,NORMAL,5.373,51.786,58.26
END_IF/
MODE/DCC
FORMAT/TEXT,OPTIONS,ID,HEADINGS,SYMBOLS, ;NOM,TOL,MEAS,MAXMIN,DEV,DEVANG,OUTTOL
ACCELERATION/MAXACCELX=1500, MAXACCELY=1500, MAXACCELZ=500
CLEARP/ZPLUS,25.4,ZPLUS,0
C2 =COMMENT/YESNO,NO,Would you like to do an auto alignment?
IF/C2.INPUT == "YES"
COMMENT/OPER,NO,The CMM will now move auto!!!
PLN2 =FEAT/PLANE,RECT,TRIANGLE
THEO/-68.241,30.477,-0.019,0.0001309,-0.0028363,0.999996
ACTL/-68.24,30.482,0.615,-0.0002813,-0.0091524,0.9999581
MEAS/PLANE,4
MOVE/CLEARPLANE
HIT/BASIC,NORMAL,-128.594,5.369,-0.189,0.0001309,-0.0028363,0.999996,-128.594,5.367,0.369,USE THEO = YES
HIT/BASIC,NORMAL,-7.562,5.251,0.007,0.0001309,-0.0028363,0.999996,-7.562,5.251,0.401,USE THEO = YES
HIT/BASIC,NORMAL,-7.823,55.961,-0.06,0.0001309,-0.0028363,0.999996,-7.823,55.96,0.866,USE THEO = YES
HIT/BASIC,NORMAL,-128.984,55.326,0.167,0.0001309,-0.0028363,0.999996,-128.985,55.326,0.825,USE THEO = YES
ENDMEAS/
LIN3 =FEAT/LINE,RECT,UNBND
THEO/-128.698,0.306,-4.287,0.9999989,-0.0015052,0
ACTL/-128.705,-0.353,-4.28,0.9999997,0.0008275,0
MEAS/LINE,5,WORKPLANE
MOVE/CLEARPLANE
HIT/BASIC,NORMAL,-128.697,0.61,-4.286,-0.0015052,-0.9999989,0,-128.703,-0.356,-4.279,USE THEO = YES
HIT/BASIC,NORMAL,-94.01,0.137,-4.297,-0.0015052,-0.9999989,0,-94.012,-0.322,-4.289,USE THEO = YES
HIT/BASIC,NORMAL,-72.223,-0.195,-4.304,-0.0015052,-0.9999989,0,-72.222,-0.302,-4.295,USE THEO = YES
HIT/BASIC,NORMAL,-30.985,0.202,-4.313,-0.0015052,-0.9999989,0,-30.989,-0.272,-4.306,USE THEO = YES
HIT/BASIC,NORMAL,-2.432,0.3,-4.32,-0.0015052,-0.9999989,0,-2.434,-0.25,-4.311,USE THEO = YES
ENDMEAS/
LIN4 =FEAT/LINE,RECT,UNBND
THEO/0.246,3.296,-4.303,-0.0021614,0.9999977,0
ACTL/0.971,3.297,-4.295,-0.0008452,0.9999996,0
MEAS/LINE,4,WORKPLANE
MOVE/CLEARPLANE
HIT/BASIC,NORMAL,0.153,3.296,-4.303,0.9999977,0.0021614,0,0.971,3.296,-4.295,USE THEO = YES
HIT/BASIC,NORMAL,0.335,9.653,-4.274,0.9999977,0.0021614,0,0.965,9.654,-4.267,USE THEO = YES
HIT/BASIC,NORMAL,0.174,50.652,-4.087,0.9999977,0.0021614,0,0.931,50.655,-4.08,USE THEO = YES
HIT/BASIC,NORMAL,0.092,56.969,-4.057,0.9999977,0.0021614,0,0.925,56.971,-4.051,USE THEO = YES
ENDMEAS/
PNT2 =FEAT/POINT,RECT
THEO/0.253,0.112,-4.295,0.9999989,-0.0015052,0
ACTL/0.974,-0.245,-4.288,0.9999997,0.0008275,0
CONSTR/POINT,INT,LIN3,LIN4
MOVE/POINT,NORMAL,4.394,56.656,69.878
A2 =ALIGNMENT/START,RECALL:A1, LIST= YES
ALIGNMENT/LEVEL,ZPLUS,PLN2
ALIGNMENT/ROTATE,XPLUS,TO,LIN3,ABOUT,ZPLUS
ALIGNMENT/TRANS,XAXIS,PNT2
ALIGNMENT/TRANS,YAXIS,PNT2
ALIGNMENT/TRANS,ZAXIS,PLN2
ALIGNMENT/END
END_IF/
COMMENT/OPER,NO,The CMM will now run the pieces. Put 3 pieces
,in the v-block Datum B to the right flush with
,the right side of the v-block ears straight up
,and down, with a square spacers between them.
,Remove the spacers before measuring.
L1 =LABEL/
C3 =COMMENT/INPUT,NO,'How many pieces do you want to run in a
,row? Max of 3'
ASSIGN/LOOPINDEX = 1
V2 =LOOP/START, ID = YES, NUMBER = C3.INPUT, START = 1, SKIP = ,
OFFSET: XAXIS = -54.75, YAXIS = 0, ZAXIS = 0, ANGLE = 0
MOVE/POINT,NORMAL,-4.637,35.676,69.796
STATS/ON,DATAPAGE,$
DIRECTORY=C:\DATAPAGE\DELPHI\4005,$
DIRECTORY=,$
READ=10,WRITE=20,MEMPAGES=64,DIMENSION NAME,CONTROLCALC OFF,$
STATS/END
PREHIT/ 1
RETRACT/ 1
LIN5 =FEAT/LINE,RECT,UNBND
THEO/-2.71,39.346,22.091,-0.0020282,-0.9999979,0
ACTL/-3.278,39.351,22.092,-0.0002207,-1,0
MEAS/LINE,8,WORKPLANE
MOVE/CLEARPLANE
HIT/BASIC,NORMAL,-2.7,39.463,19.848,-0.9999979,0.0020282,0,-3.272,39.466,19.854,USE THEO = YES
HIT/BASIC,NORMAL,-2.684,35.622,21.963,-0.9999979,0.0020282,0,-3.279,35.627,21.963,USE THEO = YES
HIT/BASIC,NORMAL,-2.786,32.739,22.98,-0.9999979,0.0020282,0,-3.284,32.741,22.98,USE THEO = YES
HIT/BASIC,NORMAL,-2.782,29.783,22.975,-0.9999979,0.0020282,0,-3.285,29.784,22.976,USE THEO = YES
HIT/BASIC,NORMAL,-2.676,26.662,22.969,-0.9999979,0.0020282,0,-3.284,26.663,22.97,USE THEO = YES
HIT/BASIC,NORMAL,-2.685,23.458,21.883,-0.9999979,0.0020282,0,-3.283,23.459,21.889,USE THEO = YES
HIT/BASIC,NORMAL,-2.772,20.965,20.513,-0.9999979,0.0020282,0,-3.281,20.966,20.522,USE THEO = YES
HIT/BASIC,NORMAL,-2.772,19.511,19.095,-0.9999979,0.0020282,0,-3.278,19.512,19.104,USE THEO = YES
ENDMEAS/
LIN6 =FEAT/LINE,RECT,UNBND
THEO/-6.536,19.194,20.942,-0.0045656,0.9999896,0
ACTL/-6.904,19.193,20.942,0.0003078,1,0
MEAS/LINE,8,WORKPLANE
MOVE/CLEARPLANE
HIT/BASIC,NORMAL,-6.55,19.291,19.232,0.999903,0.0139273,0,-6.899,19.3,19.24,USE THEO = YES
HIT/BASIC,NORMAL,-6.52,21.138,20.478,0.999903,0.0139273,0,-6.902,21.148,20.477,USE THEO = YES
HIT/BASIC,NORMAL,-6.548,22.814,21.402,0.999903,0.0139273,0,-6.904,22.827,21.402,USE THEO = YES
HIT/BASIC,NORMAL,-6.579,25.02,22.467,0.999903,0.0139273,0,-6.906,25.035,22.466,USE THEO = YES
HIT/BASIC,NORMAL,-6.618,28.497,23.163,0.999903,0.0139273,0,-6.906,28.514,23.163,USE THEO = YES
HIT/BASIC,NORMAL,-6.538,32.928,23.016,0.999903,0.0139273,0,-6.899,32.943,23.02,USE THEO = YES
HIT/BASIC,NORMAL,-6.607,35.965,22.06,0.999903,0.0139273,0,-6.901,35.981,22.069,USE THEO = YES
HIT/BASIC,NORMAL,-6.654,39.122,20.167,0.999903,0.0139273,0,-6.893,39.139,20.175,USE THEO = YES
ENDMEAS/
MOVE/POINT,NORMAL,-5.48,39.07,45.304
ASSIGN/LOOPINDEX = LOOPINDEX + 1
DIM DIST1= 2D DISTANCE FROM LINE LIN5 TO LINE LIN6 (CENTER TO CENTER), NO_RADIUS UNITS=MM ,$
GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH
AX NOMINAL +TOL -TOL MEAS MAX MIN DEV OUTTOL
M 3.861 0.035 0.035 3.631 10.981 3.680 -0.230 0.195 <--------
LOOP/END
MOVE/POINT,NORMAL,-114.739,37.669,81.865
MOVE/POINT,NORMAL,12.776,96.459,81.86
COMMENT/OPER,NO,Place next 3 pcs on v-block
GOTO/L1

[John Kingston]

I can't tell you why, but scroll to the bottom of this page. There have been quite a few discussions on this. It could just be a box you have checked or unchecked somewhere.

[dtmtim]

I'm just a rookie throwing darts. Usually PC-DMIS will ask if you want the nominals copied back to the feature when you change them in a dimension. If it is not asking could the option somehow have been turned off? I haven't used 3.7 in a while so it's possible that the option doesn't exist - if so my apologies.

t.

[Ken379128]

I though it did to but when I change it to what I want it does not ask me. But I wrote another program today and it did, Maybe if I change the plus and minus tol it will ask??? I will try it monday.

Thanks and have a great weekend all

[Erickson]

If all else fails, enter your theoreticals and targets and divide them by 1. PCDMIS thinks its an equation and doesn't mess with it. It's only a band-aid and doesn't get to the question of why it's doing it, though. I have used it before when I just couldn't figure it out...

PNT1399 =AUTO/VECTOR POINT,SHOWALLPARAMS = NO
THEO/0.2256/1,-2.222/1,-1.3738/1,0,1,0
ACTL/0.2256,-2.222,-1.3738,0,1,0
TARG/0.2256/1,-2.222/1,-1.3738/1,0,1,0

...As for why, check your alignment and make sure that everything is correct. I've seen PCDMIS do this when the alignment is off from where it thinks it's supposed to be - especially when using models. The best case I can think of is when I was generating a program for production unwittingly using a final product model. The point I was using for my Z origin was on a surface that later got qualified. The final grind removed 0.8mm. My Z theos and targets kept changing by exactly 0.8mm when the part was measured and it built the alignment.

YMMV

[Underspec]

Do you enter the nominals into the dimensioning window when doing the distance or do you just dimension the distance then go back and change it?

I would F9 the dimensions and change the nominal in the dimensioning window instead of doing it manually in the command window. If you change it manually, click yes to the "bring back to feature" part.