management had me run a test. I taped a 2,4,6 block to the table. took the top plane, x+ and y- and created my alignment. I then called them datum a top b x and c y. I measured 2 holes on each side and did a position in geotol. I used the same measured data in legacy and got a .010 difference. How can this be?
What management is saying is the position formula. 2 x (dx^2 + dy^2)^1/2 when you figure it manually using the measured values matches legacy perfectly but it is not matching in GEOTOL.
I understand this is rough and dirty test but I can not explain why parts we measure good with second methods and legacy are good. GEOTOL (which our customer uses and requires) is failing the part. I have asked Hexagon this question and keep being told that GEOTOL is correct to the standard. Which is great but the standard use the 2 x (dx^2 + dy^2)^1/2 formula and is passing this but failing in GEOTOL.
I am not bashing PCD Hexagon or anything but I can not explain it to management.
You are not evaluating GeoTol in the same DRF as Legacy. Your DCC alignment is BAC, and your GeoTol alignment is ABC. The perpendicularity between A and B could be an issue here.
mike and mark I am not understand what your talking about. I have 1 man alignment and 1 dcc alignment. I am not using legacy at all. This is all geotol. my datums are top plane b front plane a and side c
MAN_ALIG =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
ALIGNMENT/LEVEL,ZPLUS,MAN_DATUM_B
ALIGNMENT/TRANS,ZAXIS,MAN_DATUM_B
ALIGNMENT/ROTATE,YMINUS,TO,MAN_DATUM_A,ABOUT,ZPLUS
ALIGNMENT/TRANS,YAXIS,MAN_DATUM_A
ALIGNMENT/TRANS,XAXIS,MAN_C
ALIGNMENT/END
MODE/DCC
DCC_DATUM_B=FEAT/CONTACT/PLANE/DEFAULT,CARTESIAN,TRIANGLE,LEAST_SQR
THEO/<1.6683,0.8577,0>,<0,0,1>
ACTL/<1.6683,0.8577,0>,<0,0,1>
TARG/<1.6683,0.8577,0>,<0,0,1>
ANGLE VEC=<1,0,0>,SQUARE
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
NUMHITS=2,NUMROWS=2
SPACER=0.6
AVOIDANCE MOVE=BOTH,DISTANCE BEFORE=0.3937,DISTANCE AFTER=0.3937,DIRECTION=ALONG FEATURE VECTOR
SHOW HITS=NO
DCC_DATUM_A=FEAT/CONTACT/PLANE/DEFAULT,CARTESIAN,TRIANGLE,LEAST_SQR
THEO/<1.7627,0,-0.8071>,<0,-1,0>
ACTL/<1.7627,0,-0.8071>,<0,-1,0>
TARG/<1.7627,0,-0.8071>,<0,-1,0>
ANGLE VEC=<1,0,0>,SQUARE
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
NUMHITS=2,NUMROWS=2
SPACER=0
AVOIDANCE MOVE=BOTH,DISTANCE BEFORE=0.3937,DISTANCE AFTER=0.3937,DIRECTION=ALONG FEATURE VECTOR
SHOW HITS=NO
DCC_DATUM_C=FEAT/CONTACT/PLANE/DEFAULT,CARTESIAN,TRIANGLE,LEAST_SQR
THEO/<0,2.7109,-0.5737>,<-1,0,0>
ACTL/<0,2.7109,-0.5737>,<-1,0,0>
TARG/<0,2.7109,-0.5737>,<-1,0,0>
ANGLE VEC=<0,0,1>,SQUARE
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
NUMHITS=2,NUMROWS=2
SPACER=0
AVOIDANCE MOVE=BOTH,DISTANCE BEFORE=0.3937,DISTANCE AFTER=0.3937,DIRECTION=ALONG FEATURE VECTOR
SHOW HITS=NO
DCC_DATUM_C=ALIGNMENT/START,RECALL:STARTUP,LIST=YES
ALIGNMENT/LEVEL,ZPLUS,DCC_DATUM_B
ALIGNMENT/TRANS,ZAXIS,DCC_DATUM_B
ALIGNMENT/ROTATE,YMINUS,TO,DCC_DATUM_A,ABOUT,ZPLUS
ALIGNMENT/TRANS,YAXIS,DCC_DATUM_A
ALIGNMENT/TRANS,XAXIS,DCC_DATUM_C
ALIGNMENT/END
mike and mark I am not understand what your talking about. I have 1 man alignment and 1 dcc alignment. I am not using legacy at all. This is all geotol. my datums are top plane b front plane a and side c
MAN_ALIG =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
ALIGNMENT/LEVEL,ZPLUS,MAN_DATUM_B
ALIGNMENT/TRANS,ZAXIS,MAN_DATUM_B
ALIGNMENT/ROTATE,YMINUS,TO,MAN_DATUM_A,ABOUT,ZPLUS
ALIGNMENT/TRANS,YAXIS,MAN_DATUM_A
ALIGNMENT/TRANS,XAXIS,MAN_C
ALIGNMENT/END
MODE/DCC
DCC_DATUM_B=FEAT/CONTACT/PLANE/DEFAULT,CARTESIAN,TRIANGLE,LEAST_SQR
THEO/<1.6683,0.8577,0>,<0,0,1>
ACTL/<1.6683,0.8577,0>,<0,0,1>
TARG/<1.6683,0.8577,0>,<0,0,1>
ANGLE VEC=<1,0,0>,SQUARE
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
NUMHITS=2,NUMROWS=2
SPACER=0.6
AVOIDANCE MOVE=BOTH,DISTANCE BEFORE=0.3937,DISTANCE AFTER=0.3937,DIRECTION=ALONG FEATURE VECTOR
SHOW HITS=NO
DCC_DATUM_A=FEAT/CONTACT/PLANE/DEFAULT,CARTESIAN,TRIANGLE,LEAST_SQR
THEO/<1.7627,0,-0.8071>,<0,-1,0>
ACTL/<1.7627,0,-0.8071>,<0,-1,0>
TARG/<1.7627,0,-0.8071>,<0,-1,0>
ANGLE VEC=<1,0,0>,SQUARE
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
NUMHITS=2,NUMROWS=2
SPACER=0
AVOIDANCE MOVE=BOTH,DISTANCE BEFORE=0.3937,DISTANCE AFTER=0.3937,DIRECTION=ALONG FEATURE VECTOR
SHOW HITS=NO
DCC_DATUM_C=FEAT/CONTACT/PLANE/DEFAULT,CARTESIAN,TRIANGLE,LEAST_SQR
THEO/<0,2.7109,-0.5737>,<-1,0,0>
ACTL/<0,2.7109,-0.5737>,<-1,0,0>
TARG/<0,2.7109,-0.5737>,<-1,0,0>
ANGLE VEC=<0,0,1>,SQUARE
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
NUMHITS=2,NUMROWS=2
SPACER=0
AVOIDANCE MOVE=BOTH,DISTANCE BEFORE=0.3937,DISTANCE AFTER=0.3937,DIRECTION=ALONG FEATURE VECTOR
SHOW HITS=NO
DCC_DATUM_C=ALIGNMENT/START,RECALL:STARTUP,LIST=YES
ALIGNMENT/LEVEL,ZPLUS,DCC_DATUM_B
ALIGNMENT/TRANS,ZAXIS,DCC_DATUM_B
ALIGNMENT/ROTATE,YMINUS,TO,DCC_DATUM_A,ABOUT,ZPLUS
ALIGNMENT/TRANS,YAXIS,DCC_DATUM_A
ALIGNMENT/TRANS,XAXIS,DCC_DATUM_C
ALIGNMENT/END