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Highest point /Theoretical datum plane from radius

pcdmisstudent
Hi, how would i construct a datum/alignment from the highest point on a radius
And how would i get the right orientation for the dimension

Posting pic of datum and the callout/ boxed dimension
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    1. Measure a plane on datum A and then level ZPLUS to it.
    2. Measure datum D, origin X & Y on it.
    3. Measure a plane on datum B and then Rotate XPLUS to it.
    4. Add a rotation offset to rotate back by whatever the theoretical angle is between B and the vertical centre line.
    5. Scan around the R7 surface at multiple depths, ensuring you capture enough points to accurately represent the surface. The point density of your scans needs to be sufficiently high to be sure you capture the high point and the distance between scans needs to be close enough to be sure to capture any surface variation across the full depth of the radius.
    6. Construct a SET from all of your R7 scans.
    7. Your user profile says you are running 2011/ 2019 so you will need to use the MININDEX or MAXINDEX function to pull the highest point in Y from your SET / COP. (If you were running 2021.2 or newer, you could use the constructed extreme point)
    8. Construct a generic plane passing through the high point.

    Example code... 
    PLN1       =FEAT/PLANE,CARTESIAN,OUTLINE
            THEO/<0.125,-0.375,0>,<0,0,1>
            ACTL/<0.125,-0.375,0>,<0,0,1>
            MEAS/PLANE,4
              HIT/BASIC,NORMAL,<10.5,0,0>,<0,0,1>,<10.5,0,0>,USE THEO=YES
              HIT/BASIC,NORMAL,<0,10.5,0>,<0,0,1>,<0,10.5,0>,USE THEO=YES
              HIT/BASIC,NORMAL,<-10,3,0>,<0,0,1>,<-10,3,0>,USE THEO=YES
              HIT/BASIC,NORMAL,<0,-15,0>,<0,0,1>,<0,-15,0>,USE THEO=YES
            ENDMEAS/
A1         =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
              ALIGNMENT/LEVEL,ZPLUS,PLN1
              ALIGNMENT/TRANS,ZAXIS,PLN1
            ALIGNMENT/END
CYL1       =FEAT/CYLINDER,CARTESIAN,OUT,LEAST_SQR
            THEO/<0,0,-5>,<0,0,1>,14,10
            ACTL/<0,0,-5>,<0,0,1>,14,10
            MEAS/CYLINDER,8
              HIT/BASIC,NORMAL,<7,0,-10>,<1,0,0>,<7,0,-10>,USE THEO=YES
              MOVE/CIRCULAR
              HIT/BASIC,NORMAL,<0,7,-10>,<0,1,0>,<0,7,-10>,USE THEO=YES
              MOVE/CIRCULAR
              HIT/BASIC,NORMAL,<-7,0,-10>,<-1,0,0>,<-7,0,-10>,USE THEO=YES
              MOVE/CIRCULAR
              HIT/BASIC,NORMAL,<0,-7,-10>,<0,-1,0>,<0,-7,-10>,USE THEO=YES
              MOVE/CIRCULAR
              HIT/BASIC,NORMAL,<0,-7,0>,<0,-1,0>,<0,-7,0>,USE THEO=YES
              MOVE/CIRCULAR
              HIT/BASIC,NORMAL,<-7,0,0>,<-1,0,0>,<-7,0,0>,USE THEO=YES
              MOVE/CIRCULAR
              HIT/BASIC,NORMAL,<0,7,0>,<0,1,0>,<0,7,0>,USE THEO=YES
              MOVE/CIRCULAR
              HIT/BASIC,NORMAL,<7,0,0>,<1,0,0>,<7,0,0>,USE THEO=YES
            ENDMEAS/
A3         =ALIGNMENT/START,RECALL:A1,LIST=YES
              ALIGNMENT/TRANS,XAXIS,CYL1
              ALIGNMENT/TRANS,YAXIS,CYL1
            ALIGNMENT/END
PLN2       =FEAT/PLANE,CARTESIAN,OUTLINE
            THEO/<10.78,-8.065,-5>,<0.9659258,-0.258819,0>
            ACTL/<10.78,-8.065,-5>,<0.9659258,-0.258819,0>
            MEAS/PLANE,4
              HIT/BASIC,NORMAL,<12.074,-3.235,-2>,<0.9659258,-0.258819,0>,<12.074,-3.235,-2>,USE THEO=YES
              HIT/BASIC,NORMAL,<12.074,-3.235,-8>,<0.9659258,-0.258819,0>,<12.074,-3.235,-8>,USE THEO=YES
              HIT/BASIC,NORMAL,<9.486,-12.894,-8>,<0.9659258,-0.258819,0>,<9.486,-12.894,-8>,USE THEO=YES
              HIT/BASIC,NORMAL,<9.486,-12.894,-2>,<0.9659258,-0.258819,0>,<9.486,-12.894,-2>,USE THEO=YES
            ENDMEAS/
A2         =ALIGNMENT/START,RECALL:A1,LIST=YES
              ALIGNMENT/ROTATE,XPLUS,TO,PLN2,ABOUT,ZPLUS
              ALIGNMENT/ROTATE_OFFSET,15,ABOUT,ZPLUS
            ALIGNMENT/END
SCN1       =BASICSCAN/CIRCLE,NUMBER OF HITS=8,SHOW HITS=NO,SHOWALLPARAMS=NO
            ENDSCAN
SCN2       =BASICSCAN/CIRCLE,NUMBER OF HITS=8,SHOW HITS=NO,SHOWALLPARAMS=NO
            ENDSCAN
SCN3       =BASICSCAN/CIRCLE,NUMBER OF HITS=8,SHOW HITS=NO,SHOWALLPARAMS=NO
            ENDSCAN
SCN4       =BASICSCAN/CIRCLE,NUMBER OF HITS=8,SHOW HITS=NO,SHOWALLPARAMS=NO
            ENDSCAN
SCN5       =BASICSCAN/CIRCLE,NUMBER OF HITS=8,SHOW HITS=NO,SHOWALLPARAMS=NO
            ENDSCAN
SCN6       =BASICSCAN/CIRCLE,NUMBER OF HITS=8,SHOW HITS=NO,SHOWALLPARAMS=NO
            ENDSCAN
SCN7       =BASICSCAN/CIRCLE,NUMBER OF HITS=8,SHOW HITS=NO,SHOWALLPARAMS=NO
            ENDSCAN
SCN8       =BASICSCAN/CIRCLE,NUMBER OF HITS=8,SHOW HITS=NO,SHOWALLPARAMS=NO
            ENDSCAN
SCN9       =BASICSCAN/CIRCLE,NUMBER OF HITS=8,SHOW HITS=NO,SHOWALLPARAMS=NO
            ENDSCAN
SCN10      =FEAT/SET,CARTESIAN
            THEO/<-4.231,-19.671,-5>,<0,0,1>
            ACTL/<-4.231,-19.671,-5>,<0,0,1>
            CONSTR/SET,BASIC,SCN1,SCN2,SCN3,SCN4,SCN5,SCN6,SCN7,SCN8,SCN9,,
            ASSIGN/V1=MININDEX(SCN10.HIT[1..SCN10.NUMHITS].Y)
F1         =GENERIC/PLANE,DEPENDENT,CARTESIAN,$
            NOM/XYZ,<0,-19.8,0>,$
            MEAS/XYZ,<SCN10.HIT[V1].X,SCN10.HIT[V1].Y,SCN10.HIT[V1].Z>,$
            NOM/IJK,<0,-1,0>,$
            MEAS/IJK,<0,-1,0>​
Reply
    1. Measure a plane on datum A and then level ZPLUS to it.
    2. Measure datum D, origin X & Y on it.
    3. Measure a plane on datum B and then Rotate XPLUS to it.
    4. Add a rotation offset to rotate back by whatever the theoretical angle is between B and the vertical centre line.
    5. Scan around the R7 surface at multiple depths, ensuring you capture enough points to accurately represent the surface. The point density of your scans needs to be sufficiently high to be sure you capture the high point and the distance between scans needs to be close enough to be sure to capture any surface variation across the full depth of the radius.
    6. Construct a SET from all of your R7 scans.
    7. Your user profile says you are running 2011/ 2019 so you will need to use the MININDEX or MAXINDEX function to pull the highest point in Y from your SET / COP. (If you were running 2021.2 or newer, you could use the constructed extreme point)
    8. Construct a generic plane passing through the high point.

    Example code... 
    PLN1       =FEAT/PLANE,CARTESIAN,OUTLINE
            THEO/<0.125,-0.375,0>,<0,0,1>
            ACTL/<0.125,-0.375,0>,<0,0,1>
            MEAS/PLANE,4
              HIT/BASIC,NORMAL,<10.5,0,0>,<0,0,1>,<10.5,0,0>,USE THEO=YES
              HIT/BASIC,NORMAL,<0,10.5,0>,<0,0,1>,<0,10.5,0>,USE THEO=YES
              HIT/BASIC,NORMAL,<-10,3,0>,<0,0,1>,<-10,3,0>,USE THEO=YES
              HIT/BASIC,NORMAL,<0,-15,0>,<0,0,1>,<0,-15,0>,USE THEO=YES
            ENDMEAS/
A1         =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
              ALIGNMENT/LEVEL,ZPLUS,PLN1
              ALIGNMENT/TRANS,ZAXIS,PLN1
            ALIGNMENT/END
CYL1       =FEAT/CYLINDER,CARTESIAN,OUT,LEAST_SQR
            THEO/<0,0,-5>,<0,0,1>,14,10
            ACTL/<0,0,-5>,<0,0,1>,14,10
            MEAS/CYLINDER,8
              HIT/BASIC,NORMAL,<7,0,-10>,<1,0,0>,<7,0,-10>,USE THEO=YES
              MOVE/CIRCULAR
              HIT/BASIC,NORMAL,<0,7,-10>,<0,1,0>,<0,7,-10>,USE THEO=YES
              MOVE/CIRCULAR
              HIT/BASIC,NORMAL,<-7,0,-10>,<-1,0,0>,<-7,0,-10>,USE THEO=YES
              MOVE/CIRCULAR
              HIT/BASIC,NORMAL,<0,-7,-10>,<0,-1,0>,<0,-7,-10>,USE THEO=YES
              MOVE/CIRCULAR
              HIT/BASIC,NORMAL,<0,-7,0>,<0,-1,0>,<0,-7,0>,USE THEO=YES
              MOVE/CIRCULAR
              HIT/BASIC,NORMAL,<-7,0,0>,<-1,0,0>,<-7,0,0>,USE THEO=YES
              MOVE/CIRCULAR
              HIT/BASIC,NORMAL,<0,7,0>,<0,1,0>,<0,7,0>,USE THEO=YES
              MOVE/CIRCULAR
              HIT/BASIC,NORMAL,<7,0,0>,<1,0,0>,<7,0,0>,USE THEO=YES
            ENDMEAS/
A3         =ALIGNMENT/START,RECALL:A1,LIST=YES
              ALIGNMENT/TRANS,XAXIS,CYL1
              ALIGNMENT/TRANS,YAXIS,CYL1
            ALIGNMENT/END
PLN2       =FEAT/PLANE,CARTESIAN,OUTLINE
            THEO/<10.78,-8.065,-5>,<0.9659258,-0.258819,0>
            ACTL/<10.78,-8.065,-5>,<0.9659258,-0.258819,0>
            MEAS/PLANE,4
              HIT/BASIC,NORMAL,<12.074,-3.235,-2>,<0.9659258,-0.258819,0>,<12.074,-3.235,-2>,USE THEO=YES
              HIT/BASIC,NORMAL,<12.074,-3.235,-8>,<0.9659258,-0.258819,0>,<12.074,-3.235,-8>,USE THEO=YES
              HIT/BASIC,NORMAL,<9.486,-12.894,-8>,<0.9659258,-0.258819,0>,<9.486,-12.894,-8>,USE THEO=YES
              HIT/BASIC,NORMAL,<9.486,-12.894,-2>,<0.9659258,-0.258819,0>,<9.486,-12.894,-2>,USE THEO=YES
            ENDMEAS/
A2         =ALIGNMENT/START,RECALL:A1,LIST=YES
              ALIGNMENT/ROTATE,XPLUS,TO,PLN2,ABOUT,ZPLUS
              ALIGNMENT/ROTATE_OFFSET,15,ABOUT,ZPLUS
            ALIGNMENT/END
SCN1       =BASICSCAN/CIRCLE,NUMBER OF HITS=8,SHOW HITS=NO,SHOWALLPARAMS=NO
            ENDSCAN
SCN2       =BASICSCAN/CIRCLE,NUMBER OF HITS=8,SHOW HITS=NO,SHOWALLPARAMS=NO
            ENDSCAN
SCN3       =BASICSCAN/CIRCLE,NUMBER OF HITS=8,SHOW HITS=NO,SHOWALLPARAMS=NO
            ENDSCAN
SCN4       =BASICSCAN/CIRCLE,NUMBER OF HITS=8,SHOW HITS=NO,SHOWALLPARAMS=NO
            ENDSCAN
SCN5       =BASICSCAN/CIRCLE,NUMBER OF HITS=8,SHOW HITS=NO,SHOWALLPARAMS=NO
            ENDSCAN
SCN6       =BASICSCAN/CIRCLE,NUMBER OF HITS=8,SHOW HITS=NO,SHOWALLPARAMS=NO
            ENDSCAN
SCN7       =BASICSCAN/CIRCLE,NUMBER OF HITS=8,SHOW HITS=NO,SHOWALLPARAMS=NO
            ENDSCAN
SCN8       =BASICSCAN/CIRCLE,NUMBER OF HITS=8,SHOW HITS=NO,SHOWALLPARAMS=NO
            ENDSCAN
SCN9       =BASICSCAN/CIRCLE,NUMBER OF HITS=8,SHOW HITS=NO,SHOWALLPARAMS=NO
            ENDSCAN
SCN10      =FEAT/SET,CARTESIAN
            THEO/<-4.231,-19.671,-5>,<0,0,1>
            ACTL/<-4.231,-19.671,-5>,<0,0,1>
            CONSTR/SET,BASIC,SCN1,SCN2,SCN3,SCN4,SCN5,SCN6,SCN7,SCN8,SCN9,,
            ASSIGN/V1=MININDEX(SCN10.HIT[1..SCN10.NUMHITS].Y)
F1         =GENERIC/PLANE,DEPENDENT,CARTESIAN,$
            NOM/XYZ,<0,-19.8,0>,$
            MEAS/XYZ,<SCN10.HIT[V1].X,SCN10.HIT[V1].Y,SCN10.HIT[V1].Z>,$
            NOM/IJK,<0,-1,0>,$
            MEAS/IJK,<0,-1,0>​
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