Composite true positions in Legacy

I'm being required to use Legacy GDT reporting for a program.
I haven't used legacy before and need help on how to measure/report these composite true positions using it.

Datum A is a surface
Datum B is a bore
Datum C is a bore
I have my alignment set up to ABC.

In TP#1 how do I ignore C to get the AB alignment?
and how do I get just B for the composite?

In TP#2 How do I get the composite with no datums?

Can Legacy do MMC bonus or MMB datum shifts?

TP #1:

{"data-align":"none","data-size":"medium","data-tempid":"temp_22355_1648740249085_596"}

TP #2:

{"data-align":"none","data-size":"medium","data-tempid":"temp_22356_1648740215078_727"}

Parents

Cris_C over 2 years ago

For all I know, there may be an easier way to do this, but the way I tend to report composite positions using Legacy dimensions is by using best fit alignments.

As an example, let’s consider a really simple part. Something flat with a center hole and a bolt hole circle around it. We’ll call the plane Datum A, the center hole Datum B, and the hole at the 0deg orientation Datum C.

To report the position to AB, an under constrained DRF, I’d first align to ABC in the normal fashion. Then create a best fit alignment that recalls the ABC alignment. When creating the best fit alignment, select all the features that are going to be reported and select any degrees of freedom that are not constrained by the DRF. In this case all the DOFs are constrained except Z axis rotation. Ideally, you would use the Max/Min fit to support the ASME or ISO standards, but that is not supported by all combinations of DOFs, so sometimes you have to settle for a Least Squares fit.

For this example I purposely shifted CIR3 by 0.005” in both X and Y. When the calculate button is pressed you will see the largest deviation on that circle and a small amount on the others.

Then you report the hole positions using legacy reporting. Below is a graph of the deviations shown in the Graphics Display Window. Below that is the code which includes the reported values. You will see that MMC is applied. MMB could be applied to a single hole, but not to a set of holes (as far as I know). In any case, the way legacy reporting calculates MMB is a little sketchy.

PLN_A =FEAT/PLANE,CARTESIAN,OUTLINE,NO,LEAST_SQR
THEO/<0,0,0>,<0,0,1>
ACTL/<0,0,0>,<0,0,1>
CONSTR/PLANE,BF,PNT0,PNT5,PNT4,PNT3,PNT2,PNT1,,
OUTLIER_REMOVAL/OFF,3
FILTER/OFF,WAVELENGTH=0

CIR_B =GENERIC/CIRCLE,DEPENDENT,CARTESIAN,OUT,$
NOM/XYZ,<0,0,0>,$
MEAS/XYZ,<0,0,0>,$
NOM/IJK,<0,0,1>,$
MEAS/IJK,<0,0,1>,$
DIAMETER/0.5,0.5

CIR_C =GENERIC/CIRCLE,DEPENDENT,CARTESIAN,OUT,$
NOM/XYZ,<1,0,0>,$
MEAS/XYZ,<1,0,0>,$
NOM/IJK,<0,0,1>,$
MEAS/IJK,<0,0,1>,$
RADIUS/0.1,0.1

CIR1 =GENERIC/CIRCLE,DEPENDENT,CARTESIAN,OUT,$
NOM/XYZ,<0.5,0.866,0>,$
MEAS/XYZ,<0.5,0.866,0>,$
NOM/IJK,<0,0,1>,$
MEAS/IJK,<0,0,1>,$
RADIUS/0.1,0.1

CIR2 =GENERIC/CIRCLE,DEPENDENT,CARTESIAN,OUT,$
NOM/XYZ,<-0.5,0.866,0>,$
MEAS/XYZ,<-0.5,0.866,0>,$
NOM/IJK,<0,0,1>,$
MEAS/IJK,<0,0,1>,$
RADIUS/0.1,0.1

CIR3 =GENERIC/CIRCLE,DEPENDENT,CARTESIAN,OUT,$
NOM/XYZ,<-1,0,0>,$
MEAS/XYZ,<-1.005,0.0005,0>,$
NOM/IJK,<0,0,1>,$
MEAS/IJK,<0,0,1>,$
RADIUS/0.1,0.1

CIR4 =GENERIC/CIRCLE,DEPENDENT,CARTESIAN,OUT,$
NOM/XYZ,<-0.5,-0.866,0>,$
MEAS/XYZ,<-0.5,-0.866,0>,$
NOM/IJK,<0,0,1>,$
MEAS/IJK,<0,0,1>,$
RADIUS/0.1,0.1

CIR5 =GENERIC/CIRCLE,DEPENDENT,CARTESIAN,OUT,$
NOM/XYZ,<0.5,-0.866,0>,$
MEAS/XYZ,<0.5,-0.866,0>,$
NOM/IJK,<0,0,1>,$
MEAS/IJK,<0,0,1>,$
RADIUS/0.1,0.1

ALN_ABC =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
ALIGNMENT/LEVEL,ZPLUS,PLN_A
ALIGNMENT/ROTATE_CIRCLE,XPLUS,TO,CIR_B,AND,CIR_C,ABOUT,ZPLUS
ALIGNMENT/TRANS,ZAXIS,PLN_A
ALIGNMENT/TRANS,XAXIS,CIR_B
ALIGNMENT/TRANS,YAXIS,CIR_B
ALIGNMENT/END

A5 =ALIGNMENT/START,RECALL:ALN_ABC,LIST=YES
ALIGNMENT/BF2D,ZPLUS,MIN_MAX,CREATE WEIGHTS=NO,ROTONLY,0,0,0,359.9715
ITERATEANDREPIERCECAD=NO
Deviation Threshold=0.02
SHOWALLINPUTS=YES,SHOWALLPARAMS=YES
ID=CIR_C,Circles,,1,YES
ID=CIR5,Circles,,1,YES
ID=CIR1,Circles,,1,YES
ID=CIR2,Circles,,1,YES
ID=CIR3,Circles,,1,YES
ID=CIR4,Circles,,1,YES
ID=
ALIGNMENT/END

WORKPLANE/ZPLUS
DIM LOC1= POSITION OF CIRCLE CIR_C UNITS=IN ,$
GRAPH=ON TEXT=OFF MULT=50.00 OUTPUT=BOTH FIT TO DATUMS=OFF DEV PERPEN CENTERLINE=OFF DISPLAY=DIAMETER
AX NOMINAL MEAS +TOL -TOL BONUS DEV DEVANG OUTTOL
X 1.0000 1.0000 0.0000
Y 0.0000 0.0005 0.0005
DF 0.2000 0.2000 0.0050 0.0050 0.0050 0.0000 0.0000 #
TP MMC 0.0010 0.0100 0.0050 0.0010 90.0143 0.0000 #
END OF DIMENSION LOC1

DIM LOC2= POSITION OF CIRCLE CIR1 UNITS=IN ,$
GRAPH=ON TEXT=OFF MULT=50.00 OUTPUT=BOTH FIT TO DATUMS=OFF DEV PERPEN CENTERLINE=OFF DISPLAY=DIAMETER
AX NOMINAL MEAS +TOL -TOL BONUS DEV DEVANG OUTTOL
X 0.5000 0.4996 -0.0004
Y 0.8660 0.8663 0.0002
DF 0.2000 0.2000 0.0050 0.0050 0.0050 0.0000 0.0000 #
TP MMC 0.0010 0.0100 0.0050 0.0010 150.0143 0.0000 #
END OF DIMENSION LOC2

DIM LOC3= POSITION OF CIRCLE CIR2 UNITS=IN ,$
GRAPH=ON TEXT=OFF MULT=50.00 OUTPUT=BOTH FIT TO DATUMS=OFF DEV PERPEN CENTERLINE=OFF DISPLAY=DIAMETER
AX NOMINAL MEAS +TOL -TOL BONUS DEV DEVANG OUTTOL
X -0.5000 -0.5004 -0.0004
Y 0.8660 0.8658 -0.0002
DF 0.2000 0.2000 0.0050 0.0050 0.0050 0.0000 0.0000 #
TP MMC 0.0010 0.0100 0.0050 0.0010 -149.9857 0.0000 #
END OF DIMENSION LOC3

DIM LOC4= POSITION OF CIRCLE CIR3 UNITS=IN ,$
GRAPH=ON TEXT=OFF MULT=50.00 OUTPUT=BOTH FIT TO DATUMS=OFF DEV PERPEN CENTERLINE=OFF DISPLAY=DIAMETER
AX NOMINAL MEAS +TOL -TOL BONUS DEV DEVANG OUTTOL
X -1.0000 -1.0050 -0.0050
Y 0.0000 0.0000 0.0000
DF 0.2000 0.2000 0.0050 0.0050 0.0050 0.0000 0.0000 #
TP MMC 0.0100 0.0100 0.0050 0.0100 -179.9978 0.0000 #
END OF DIMENSION LOC4

DIM LOC5= POSITION OF CIRCLE CIR4 UNITS=IN ,$
GRAPH=ON TEXT=OFF MULT=50.00 OUTPUT=BOTH FIT TO DATUMS=OFF DEV PERPEN CENTERLINE=OFF DISPLAY=DIAMETER
AX NOMINAL MEAS +TOL -TOL BONUS DEV DEVANG OUTTOL
X -0.5000 -0.4996 0.0004
Y -0.8660 -0.8663 -0.0002
DF 0.2000 0.2000 0.0050 0.0050 0.0050 0.0000 0.0000 #
TP MMC 0.0010 0.0100 0.0050 0.0010 -29.9857 0.0000 #
END OF DIMENSION LOC5

DIM LOC6= POSITION OF CIRCLE CIR5 UNITS=IN ,$
GRAPH=ON TEXT=OFF MULT=50.00 OUTPUT=BOTH FIT TO DATUMS=OFF DEV PERPEN CENTERLINE=OFF DISPLAY=DIAMETER
AX NOMINAL MEAS +TOL -TOL BONUS DEV DEVANG OUTTOL
X 0.5000 0.5004 0.0004
Y -0.8660 -0.8658 0.0002
DF 0.2000 0.2000 0.0050 0.0050 0.0050 0.0000 0.0000 #
TP MMC 0.0010 0.0100 0.0050 0.0010 30.0143 0.0000 #
END OF DIMENSION LOC6

I will try to provide an example for full unconstrained soon, but there is a limit to how many pictures you can put in one post.

Reply

Cris_C over 2 years ago

PLN_A =FEAT/PLANE,CARTESIAN,OUTLINE,NO,LEAST_SQR
THEO/<0,0,0>,<0,0,1>
ACTL/<0,0,0>,<0,0,1>
CONSTR/PLANE,BF,PNT0,PNT5,PNT4,PNT3,PNT2,PNT1,,
OUTLIER_REMOVAL/OFF,3
FILTER/OFF,WAVELENGTH=0

CIR_B =GENERIC/CIRCLE,DEPENDENT,CARTESIAN,OUT,$
NOM/XYZ,<0,0,0>,$
MEAS/XYZ,<0,0,0>,$
NOM/IJK,<0,0,1>,$
MEAS/IJK,<0,0,1>,$
DIAMETER/0.5,0.5

CIR_C =GENERIC/CIRCLE,DEPENDENT,CARTESIAN,OUT,$
NOM/XYZ,<1,0,0>,$
MEAS/XYZ,<1,0,0>,$
NOM/IJK,<0,0,1>,$
MEAS/IJK,<0,0,1>,$
RADIUS/0.1,0.1

CIR1 =GENERIC/CIRCLE,DEPENDENT,CARTESIAN,OUT,$
NOM/XYZ,<0.5,0.866,0>,$
MEAS/XYZ,<0.5,0.866,0>,$
NOM/IJK,<0,0,1>,$
MEAS/IJK,<0,0,1>,$
RADIUS/0.1,0.1

CIR2 =GENERIC/CIRCLE,DEPENDENT,CARTESIAN,OUT,$
NOM/XYZ,<-0.5,0.866,0>,$
MEAS/XYZ,<-0.5,0.866,0>,$
NOM/IJK,<0,0,1>,$
MEAS/IJK,<0,0,1>,$
RADIUS/0.1,0.1

CIR3 =GENERIC/CIRCLE,DEPENDENT,CARTESIAN,OUT,$
NOM/XYZ,<-1,0,0>,$
MEAS/XYZ,<-1.005,0.0005,0>,$
NOM/IJK,<0,0,1>,$
MEAS/IJK,<0,0,1>,$
RADIUS/0.1,0.1

CIR4 =GENERIC/CIRCLE,DEPENDENT,CARTESIAN,OUT,$
NOM/XYZ,<-0.5,-0.866,0>,$
MEAS/XYZ,<-0.5,-0.866,0>,$
NOM/IJK,<0,0,1>,$
MEAS/IJK,<0,0,1>,$
RADIUS/0.1,0.1

CIR5 =GENERIC/CIRCLE,DEPENDENT,CARTESIAN,OUT,$
NOM/XYZ,<0.5,-0.866,0>,$
MEAS/XYZ,<0.5,-0.866,0>,$
NOM/IJK,<0,0,1>,$
MEAS/IJK,<0,0,1>,$
RADIUS/0.1,0.1

ALN_ABC =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
ALIGNMENT/LEVEL,ZPLUS,PLN_A
ALIGNMENT/ROTATE_CIRCLE,XPLUS,TO,CIR_B,AND,CIR_C,ABOUT,ZPLUS
ALIGNMENT/TRANS,ZAXIS,PLN_A
ALIGNMENT/TRANS,XAXIS,CIR_B
ALIGNMENT/TRANS,YAXIS,CIR_B
ALIGNMENT/END

A5 =ALIGNMENT/START,RECALL:ALN_ABC,LIST=YES
ALIGNMENT/BF2D,ZPLUS,MIN_MAX,CREATE WEIGHTS=NO,ROTONLY,0,0,0,359.9715
ITERATEANDREPIERCECAD=NO
Deviation Threshold=0.02
SHOWALLINPUTS=YES,SHOWALLPARAMS=YES
ID=CIR_C,Circles,,1,YES
ID=CIR5,Circles,,1,YES
ID=CIR1,Circles,,1,YES
ID=CIR2,Circles,,1,YES
ID=CIR3,Circles,,1,YES
ID=CIR4,Circles,,1,YES
ID=
ALIGNMENT/END

WORKPLANE/ZPLUS
DIM LOC1= POSITION OF CIRCLE CIR_C UNITS=IN ,$
GRAPH=ON TEXT=OFF MULT=50.00 OUTPUT=BOTH FIT TO DATUMS=OFF DEV PERPEN CENTERLINE=OFF DISPLAY=DIAMETER
AX NOMINAL MEAS +TOL -TOL BONUS DEV DEVANG OUTTOL
X 1.0000 1.0000 0.0000
Y 0.0000 0.0005 0.0005
DF 0.2000 0.2000 0.0050 0.0050 0.0050 0.0000 0.0000 #
TP MMC 0.0010 0.0100 0.0050 0.0010 90.0143 0.0000 #
END OF DIMENSION LOC1

DIM LOC2= POSITION OF CIRCLE CIR1 UNITS=IN ,$
GRAPH=ON TEXT=OFF MULT=50.00 OUTPUT=BOTH FIT TO DATUMS=OFF DEV PERPEN CENTERLINE=OFF DISPLAY=DIAMETER
AX NOMINAL MEAS +TOL -TOL BONUS DEV DEVANG OUTTOL
X 0.5000 0.4996 -0.0004
Y 0.8660 0.8663 0.0002
DF 0.2000 0.2000 0.0050 0.0050 0.0050 0.0000 0.0000 #
TP MMC 0.0010 0.0100 0.0050 0.0010 150.0143 0.0000 #
END OF DIMENSION LOC2

DIM LOC3= POSITION OF CIRCLE CIR2 UNITS=IN ,$
GRAPH=ON TEXT=OFF MULT=50.00 OUTPUT=BOTH FIT TO DATUMS=OFF DEV PERPEN CENTERLINE=OFF DISPLAY=DIAMETER
AX NOMINAL MEAS +TOL -TOL BONUS DEV DEVANG OUTTOL
X -0.5000 -0.5004 -0.0004
Y 0.8660 0.8658 -0.0002
DF 0.2000 0.2000 0.0050 0.0050 0.0050 0.0000 0.0000 #
TP MMC 0.0010 0.0100 0.0050 0.0010 -149.9857 0.0000 #
END OF DIMENSION LOC3

DIM LOC4= POSITION OF CIRCLE CIR3 UNITS=IN ,$
GRAPH=ON TEXT=OFF MULT=50.00 OUTPUT=BOTH FIT TO DATUMS=OFF DEV PERPEN CENTERLINE=OFF DISPLAY=DIAMETER
AX NOMINAL MEAS +TOL -TOL BONUS DEV DEVANG OUTTOL
X -1.0000 -1.0050 -0.0050
Y 0.0000 0.0000 0.0000
DF 0.2000 0.2000 0.0050 0.0050 0.0050 0.0000 0.0000 #
TP MMC 0.0100 0.0100 0.0050 0.0100 -179.9978 0.0000 #
END OF DIMENSION LOC4

DIM LOC5= POSITION OF CIRCLE CIR4 UNITS=IN ,$
GRAPH=ON TEXT=OFF MULT=50.00 OUTPUT=BOTH FIT TO DATUMS=OFF DEV PERPEN CENTERLINE=OFF DISPLAY=DIAMETER
AX NOMINAL MEAS +TOL -TOL BONUS DEV DEVANG OUTTOL
X -0.5000 -0.4996 0.0004
Y -0.8660 -0.8663 -0.0002
DF 0.2000 0.2000 0.0050 0.0050 0.0050 0.0000 0.0000 #
TP MMC 0.0010 0.0100 0.0050 0.0010 -29.9857 0.0000 #
END OF DIMENSION LOC5

DIM LOC6= POSITION OF CIRCLE CIR5 UNITS=IN ,$
GRAPH=ON TEXT=OFF MULT=50.00 OUTPUT=BOTH FIT TO DATUMS=OFF DEV PERPEN CENTERLINE=OFF DISPLAY=DIAMETER
AX NOMINAL MEAS +TOL -TOL BONUS DEV DEVANG OUTTOL
X 0.5000 0.5004 0.0004
Y -0.8660 -0.8658 0.0002
DF 0.2000 0.2000 0.0050 0.0050 0.0050 0.0000 0.0000 #
TP MMC 0.0010 0.0100 0.0050 0.0010 30.0143 0.0000 #
END OF DIMENSION LOC6

I will try to provide an example for full unconstrained soon, but there is a limit to how many pictures you can put in one post.

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