Which is the better Best-Fit alignment to use when comparing point deviation to CAD models? (Least Squares or Vector) Example, I am measuring these 36 points and using a 3D best-fit alignment. I am getting pretty substantial differences in the profile depending on the best-fit type. I have Rotate and Translate 3D alignment, but in the Least-SQR alignment it appears a -X- translation would help. What am I doing wrong?
RECALL/ALIGNMENT,INTERNAL,A5
A8 =ALIGNMENT/START,RECALL:A5,LIST=YES
ALIGNMENT/BF3D,LEAST_SQR,CREATE WEIGHTS=NO,ROTANDTRANS,USE SCALING=NO,-0.0053,0,-0.0032,-0.0004,-0.001,-0.0102
ITERATEANDREPIERCECAD=NO
Deviation Threshold=0.0003937
SHOWALLINPUTS=NO,SHOWALLPARAMS=NO
ALIGNMENT/END
FORMAT/TEXT,OPTIONS, ,HEADINGS,SYMBOLS, ;NOM,MAXMIN, , , , ,
SCN1 =FEAT/SET,CARTESIAN
THEO/<0,-1,0>,<0,1,0>
ACTL/<0,-1,0>,<0,1,0>
CONSTR/SET,BASIC,PNT145,PNT146,PNT147,PNT148,PNT149,PNT150,PNT151,PNT152,PNT153,PNT154,PNT155,PNT156,PNT157 ,PNT158,PNT159,PNT160,PNT161,PNT162,PNT163,PNT164, PNT165,PNT166,PNT167,PNT168,PNT169,PNT170,PNT171,PNT172,PNT173,PNT174,PNT175,$
PNT176,PNT177,PNT178,PNT179,PNT180,,
DIM PROF5= PROFILE OF SURFACE OF SET SCN1 FORMANDLOCATION UNITS=MM ,$
GRAPH=ON TEXT=OFF MULT=100.00 ARROWDENSITY=100 OUTPUT=BOTH
AX NOMINAL MAX MIN
M 0.0000 0.1668 -0.1632 <---|--->
RECALL/ALIGNMENT,INTERNAL,A5
A8 =ALIGNMENT/START,RECALL:A5,LIST=YES
ALIGNMENT/BF3D,VECTOR_LST_SQR,CREATE WEIGHTS=NO,ROTANDTRANS,-0.0107,0,-0.0063,0.0059,-0.0011,-0.01
ITERATEANDREPIERCECAD=NO
Deviation Threshold=0.0003937
SHOWALLINPUTS=NO,SHOWALLPARAMS=NO
ALIGNMENT/END
FORMAT/TEXT,OPTIONS, ,HEADINGS,SYMBOLS, ;NOM,MAXMIN, , , , ,
SCN1 =FEAT/SET,CARTESIAN
THEO/<0,-1,0>,<0,1,0>
ACTL/<0.0053,-1,0.0031>,<0.0001093,1,0.0000014>
CONSTR/SET,BASIC,PNT145,PNT146,PNT147,PNT148,PNT149,PNT150,PNT151,PNT152,PNT153,PNT154,PNT155,PNT156,PNT157 ,PNT158,PNT159,PNT160,PNT161,PNT162,PNT163,PNT164, PNT165,PNT166,PNT167,PNT168,PNT169,PNT170,PNT171,PNT172,PNT173,PNT174,PNT175,$
PNT176,PNT177,PNT178,PNT179,PNT180,,
DIM PROF5= PROFILE OF SURFACE OF SET SCN1 FORMANDLOCATION UNITS=MM ,$
GRAPH=ON TEXT=OFF MULT=100.00 ARROWDENSITY=100 OUTPUT=BOTH
AX NOMINAL MAX MIN
M 0.0000 0.0304 -0.0151 ----|#---
