Iterative Alignment

Hi Everyone!

I am working with a forge part with no datum structure. It is calling for a profile of .120 u .09 to itself. (+.09/-.03).

My though is that the simplest way to approach this is with an iterative alignment (machine to part), then go to town with auto feature vector points (or would it best to use measure point and why?). And do a best fit alignment of all and only the profile point then dimension it.

I am working offline. I see the deviations when dimensioning which and should be at zero. So what I am gathering is my alignment needs adjusting?

Q:

It won’t let me upload a picture it is prompting me this message "Upload failed due to your usergroup's upload quota. This file will require 50.2 KB but you only have 17.1 kb of 1.50 MB remaining". How do fix this so I may upload a snip.
Will I get arcuate results?
How would I double check myself?
What are the cons of using a read-point for an iterative alignment? I love the idea of removing the manual probing completely. But is it and will it be aureate?

READ POINT =FEAT/POINT,CARTESIAN
THEO/<24.81,-2.56,3.11>,<0,0,1>
ACTL/<35.41,-19.35,20.98>,<0,0,1>
READPOINT/
A1 =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
ALIGNMENT/TRANS,XAXIS,
ALIGNMENT/TRANS,YAXIS,
ALIGNMENT/TRANS,ZAXIS,
ALIGNMENT/TRANS,XAXIS,READ POINT
ALIGNMENT/TRANS,YAXIS,READ POINT
ALIGNMENT/TRANS,ZAXIS,READ POINT
ALIGNMENT/END
PNT3 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<0.02,0.22,-0.2>,<-0.0756796,-0.7370436,0.6715946>
ACTL/<0.02,0.22,-0.2>,<-0.0756796,-0.7370436,0.6715946>
TARG/<0.02,0.22,-0.2>,<-0.0756796,-0.7370436,0.6715946>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
AVOIDANCE MOVE=NO,DISTANCE=0.2
SHOW HITS=NO
A2 =ALIGNMENT/START,RECALL:A1,LIST=YES
ALIGNMENT/TRANS,XAXIS,PNT3
ALIGNMENT/TRANS,YAXIS,PNT3
ALIGNMENT/TRANS,ZAXIS,PNT3
ALIGNMENT/END
PNT1 =FEAT/POINT,CARTESIAN
THEO/<-0.1,0.54,0.12>,<-0.1119777,0,0.9937107>
ACTL/<-0.1,0.54,0.12>,<-0.1119777,0,0.9937107>
MEAS/POINT,1,WORKPLANE
HIT/BASIC,NORMAL,<-0.1,0.54,0.12>,<-0.1119777,0,0.9937107>,<-0.1,0.54,0.12>,USE THEO=YES
ENDMEAS/
PNT2 =FEAT/POINT,CARTESIAN
THEO/<-0.79,1.59,0.04>,<-0.1119777,0,0.9937107>
ACTL/<-0.79,1.59,0.04>,<-0.1119777,0,0.9937107>
MEAS/POINT,1,WORKPLANE
HIT/BASIC,NORMAL,<-0.79,1.59,0.04>,<-0.1119777,0,0.9937107>,<-0.79,1.59,0.04>,USE THEO=YES
ENDMEAS/
PNT4 =FEAT/POINT,CARTESIAN
THEO/<-0.46,2.98,0.08>,<-0.1119777,0,0.9937107>
ACTL/<-0.46,2.98,0.08>,<-0.1119777,0,0.9937107>
MEAS/POINT,1,WORKPLANE
HIT/BASIC,NORMAL,<-0.46,2.98,0.08>,<-0.1119777,0,0.9937107>,<-0.46,2.98,0.08>,USE THEO=YES
ENDMEAS/
PNT5 =FEAT/POINT,CARTESIAN
THEO/<-0.92,4.27,0.03>,<-0.1119777,0,0.9937107>
ACTL/<-0.92,4.27,0.03>,<-0.1119777,0,0.9937107>
MEAS/POINT,1,WORKPLANE
HIT/BASIC,NORMAL,<-0.92,4.27,0.03>,<-0.1119777,0,0.9937107>,<-0.92,4.27,0.03>,USE THEO=YES
ENDMEAS/
MOVE/POINT,NORMAL,<-0.38,3.02,0.39>
MOVE/POINT,NORMAL,<-0.08,2.89,0.36>
MOVE/POINT,NORMAL,<0.17,2.83,0.16>
PNT6 =FEAT/POINT,CARTESIAN
THEO/<0.01,2.59,-0.19>,<0.9531094,0.1915064,0.2343242>
ACTL/<0.01,2.59,-0.19>,<0.9531094,0.1915064,0.2343242>
MEAS/POINT,1,WORKPLANE
HIT/BASIC,NORMAL,<0.01,2.59,-0.19>,<0.9531094,0.1915064,0.2343242>,<0.01,2.59,-0.19>,USE THEO=YES
ENDMEAS/
PNT7 =FEAT/POINT,CARTESIAN
THEO/<0.28,0.72,-0.17>,<0.9767192,0.0946515,0.1925116>
ACTL/<0.28,0.72,-0.17>,<0.9767192,0.0946515,0.1925116>
MEAS/POINT,1,WORKPLANE
HIT/BASIC,NORMAL,<0.28,0.72,-0.17>,<0.9767192,0.0946515,0.1925116>,<0.28,0.72,-0.17>,USE THEO=YES
ENDMEAS/
MOVE/POINT,NORMAL,<0.61,0.04,-0.19>
MOVE/POINT,NORMAL,<0.58,-0.13,-0.28>
MOVE/POINT,NORMAL,<0.5,-0.25,-0.33>
MOVE/POINT,NORMAL,<0.29,-0.39,-0.42>
PNT8 =FEAT/POINT,CARTESIAN
THEO/<0.04,-0.11,-0.46>,<0,-1,0>
ACTL/<0.04,-0.11,-0.46>,<0,-1,0>
MEAS/POINT,1,WORKPLANE
HIT/BASIC,NORMAL,<0.04,-0.11,-0.46>,<0,-1,0>,<0.04,-0.11,-0.46>,USE THEO=YES
MOVE/POINT,NORMAL,<0.04,-0.4,-0.46>
ENDMEAS/
MOVE/POINT,NORMAL,<0.01,-0.37,-0.06>
MOVE/POINT,NORMAL,<-0.08,-0.16,0.25>
MOVE/POINT,NORMAL,<-0.04,0.13,0.41>
A3 =ALIGNMENT/START,RECALL:A2,LIST=YES
ALIGNMENT/ITERATE
PNT TARGET RAD=0.05,START LABEL=,FIXTURE TOL=0,ERROR LABEL=
MEAS ALL FEAT=ALWAYS,MAX ITERATIONS=5,LEVEL AXIS=ZAXIS,ROTATE AXIS=XAXIS,ORIGIN AXIS=YAXIS
LEVEL=PNT1,PNT2,PNT3,PNT4,,
ROTATE=PNT5,PNT6,,
ORIGIN=PNT8,,
ALIGNMENT/END
PNT_1 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<-0.21,0.98,0.11>,<-0.1119777,0,0.9937107>
ACTL/<-0.21,0.98,0.11>,<-0.1119777,0,0.9937107>
TARG/<-0.21,0.98,0.11>,<-0.1119777,0,0.9937107>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
AVOIDANCE MOVE=NO,DISTANCE=0.2
SHOW HITS=NO
MOVE/POINT,NORMAL,<-0.34,0.5,0.38>
MOVE/POINT,NORMAL,<-0.55,0.4,0.23>
MOVE/POINT,NORMAL,<-0.64,0.36,0.03>
PNT_2 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<-0.34,0.28,-0.41>,<-0.9921095,-0.1249404,0.0104189>
ACTL/<-0.34,0.28,-0.41>,<-0.9921095,-0.1249404,0.0104189>
TARG/<-0.34,0.28,-0.41>,<-0.9921095,-0.1249404,0.0104189>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
AVOIDANCE MOVE=NO,DISTANCE=0.2
SHOW HITS=NO
PNT_3 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<-0.3,0.12,-1.64>,<-0.9302715,-0.3668206,-0.0061264>
ACTL/<-0.3,0.12,-1.64>,<-0.9302715,-0.3668206,-0.0061264>
TARG/<-0.3,0.12,-1.64>,<-0.9302715,-0.3668206,-0.0061264>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
AVOIDANCE MOVE=NO,DISTANCE=0.2
SHOW HITS=NO
MOVE/POINT,NORMAL,<-0.67,0.33,-1.2>
MOVE/POINT,NORMAL,<-0.72,0.44,-1.12>
PNT_4 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<-0.51,0.65,-1.16>,<-0.7020729,-0.6942352,0.1585279>
ACTL/<-0.51,0.65,-1.16>,<-0.7020729,-0.6942352,0.1585279>
TARG/<-0.51,0.65,-1.16>,<-0.7020729,-0.6942352,0.1585279>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
AVOIDANCE MOVE=NO,DISTANCE=0.2
SHOW HITS=NO
MOVE/POINT,NORMAL,<-1.08,0.51,-1.18>
MOVE/POINT,NORMAL,<-1.25,0.6,-1.19>
MOVE/POINT,NORMAL,<-1.4,0.79,-1.25>
MOVE/POINT,NORMAL,<-1.43,0.92,-1.36>
PNT_5 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<-1.16,1.04,-1.78>,<-0.9965702,-0.0560934,0.0608383>
ACTL/<-1.16,1.04,-1.78>,<-0.9965702,-0.0560934,0.0608383>
TARG/<-1.16,1.04,-1.78>,<-0.9965702,-0.0560934,0.0608383>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
AVOIDANCE MOVE=NO,DISTANCE=0.2
SHOW HITS=NO
PNT_6 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<-1.19,1.32,-0.43>,<-0.9986704,-0.0483447,0.0178954>
ACTL/<-1.19,1.32,-0.43>,<-0.9986704,-0.0483447,0.0178954>
TARG/<-1.19,1.32,-0.43>,<-0.9986704,-0.0483447,0.0178954>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=YES
AVOIDANCE MOVE=NO,DISTANCE=0.2
SHOW HITS=NO
A4 =ALIGNMENT/START,RECALL:A3,LIST=YES
ALIGNMENT/BF3D,LEAST_SQR,CREATE WEIGHTS=NO,ROTANDTRANS,USE SCALING=NO,0,0,0,0.02,-0.03,0
ITERATEANDREPIERCECAD=YES,TOLERANCE=1000,MAX ITERATIONS=100
Deviation Threshold=0.0003937
SHOWALLINPUTS=NO,SHOWALLPARAMS=NO
ALIGNMENT/END
$$ NO,
!@ DIMENSIONS @!
DISPLAYPRECISION/4
DIM PRFL_1= LOCATION OF POINT PNT_1 UNITS=IN ,$
GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH HALF ANGLE=NO
AX NOMINAL +TOL -TOL MEAS DEV OUTTOL
T 0.0000 0.0900 0.0300 -0.0014 -0.0014 0.0000 --#---------
END OF DIMENSION PRFL_1
ASSIGN/V1=PRFL_1.T.OUTTOL
IF/V1<>0
COMMENT/OPER,NO,FULL SCREEN=YES,AUTO-CONTINUE=NO,
! ERROR !

"PROFILE LOC1 IS OUT BY "+V1+""

--- PLEASE CANCEL AND INFORM SUPER/PROGRAMER
AND DON'T CONTINUE

END_IF/
DIM PRFL_2= LOCATION OF POINT PNT_2 UNITS=IN ,$
GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH HALF ANGLE=NO
AX NOMINAL +TOL -TOL MEAS DEV OUTTOL
T 0.0000 0.0900 0.0300 0.0003 0.0003 0.0000 ---#--------
END OF DIMENSION PRFL_2
ASSIGN/V2=PRFL_2.T.OUTTOL
IF/V2<>0
COMMENT/OPER,NO,FULL SCREEN=YES,AUTO-CONTINUE=NO,
! ERROR !

"PROFILE LOC2 IS OUT BY "+V2+""

--- PLEASE CANCEL AND INFORM SUPER/PROGRAMER
AND DON'T CONTINUE

END_IF/
DIM PRFL_3= LOCATION OF POINT PNT_3 UNITS=IN ,$
GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH HALF ANGLE=NO
AX NOMINAL +TOL -TOL MEAS DEV OUTTOL
T 0.0000 0.0900 0.0300 0.0005 0.0005 0.0000 ---#--------
END OF DIMENSION PRFL_3
ASSIGN/V3=PRFL_3.T.OUTTOL
IF/V3<>0
COMMENT/OPER,NO,FULL SCREEN=YES,AUTO-CONTINUE=NO,
! ERROR !

"PROFILE LOC3 IS OUT BY "+V3+""

--- PLEASE CANCEL AND INFORM SUPER/PROGRAMER
AND DON'T CONTINUE

END_IF/
DIM PRFL_4= LOCATION OF POINT PNT_4 UNITS=IN ,$
GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH HALF ANGLE=NO
AX NOMINAL +TOL -TOL MEAS DEV OUTTOL
T 0.0000 0.0900 0.0300 0.0005 0.0005 0.0000 ---#--------
END OF DIMENSION PRFL_4
ASSIGN/V4=PRFL_4.T.OUTTOL
IF/V4<>0
COMMENT/OPER,NO,FULL SCREEN=YES,AUTO-CONTINUE=NO,
! ERROR !

"PROFILE LOC4 IS OUT BY "+V4+""

--- PLEASE CANCEL AND INFORM SUPER/PROGRAMER
AND DON'T CONTINUE

END_IF/
DIM LOC5= LOCATION OF POINT PNT_5 UNITS=IN ,$
GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH HALF ANGLE=NO
AX NOMINAL +TOL -TOL MEAS DEV OUTTOL
T 0.0000 0.0900 0.0300 -0.0002 -0.0002 0.0000 --#---------
END OF DIMENSION LOC5
ASSIGN/V5=LOC5.T.OUTTOL
IF/V5<>0
COMMENT/OPER,NO,FULL SCREEN=YES,AUTO-CONTINUE=NO,
! ERROR !

"PROFILE LOC5 IS OUT BY "+V5+""

--- PLEASE CANCEL AND INFORM SUPER/PROGRAMER
AND DON'T CONTINUE

END_IF/
DIM PRFL_6= LOCATION OF POINT PNT_6 UNITS=IN ,$
GRAPH=OFF TEXT=OFF MULT=10.00 OUTPUT=BOTH HALF ANGLE=NO
AX NOMINAL +TOL -TOL MEAS DEV OUTTOL
T 0.0000 0.0900 0.0300 -0.0002 -0.0002 0.0000 --#---------
END OF DIMENSION PRFL_6
ASSIGN/V6=PRFL_6.T.OUTTOL
IF/V6<>0
COMMENT/OPER,NO,FULL SCREEN=YES,AUTO-CONTINUE=NO,
! ERROR !

"PROFILE LOC6 IS OUT BY "+V6+""

--- PLEASE CANCEL AND INFORM SUPER/PROGRAMER
AND DON'T CONTINUE

END_IF/

Thank you for taking the time !!!
neil.challinor

Parents

Mike Ruff over 4 years ago

ProbFlex the vector determines the angle that the hit is taken at. All hits need to be taken normal to (perpendicular to) the surface they are on. PC-DMIS uses what is called a unit vector (a unit vector always has a length of 1) so for a vector <i,j,k>, it will always be i^2 + j^2 + k^2 = 1. And i = the length of the unit vector along X, j = the length of the vector along Y, and k = the length of the vector along Z. A vector of <0,0,1> is pointed straight up perfectly parallel to the Z-axis. A vector of <0,0,-1> is pointed straight down perfectly parallel to the Z-axis. A vector of <.70710678,-.70710678,0> is in the X-Y plane (since k=0 there is no Z-deviation) and it will be pointed at -45° from the X+ axis.

HTH

EDIT: one more piece of very important informantion- the vector is ALWAYS in the coordinates of the active alignment!
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Mike Ruff over 4 years ago in reply to Mike Ruff

Exactly. During the STARTUP alignment, the vectors may be very strange as they are based off of the CAD origin. Since the iterative alignment levels to PNT1, PNT2, PNT4, and PNT5 (I'm assuming these are coplanar points), I would expect that AFTER the iterative alignment, a point created on this surface should have a vector of <0,0,1>

For features taken off CAD, the CAD defines the XYZIJK, but the XYZIJK are relative to the active, or current, alignment. That's all I was trying to say, maybe I wasn't very clear with my wording.
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Mike Ruff over 4 years ago in reply to Mike Ruff

Exactly. During the STARTUP alignment, the vectors may be very strange as they are based off of the CAD origin. Since the iterative alignment levels to PNT1, PNT2, PNT4, and PNT5 (I'm assuming these are coplanar points), I would expect that AFTER the iterative alignment, a point created on this surface should have a vector of <0,0,1>

For features taken off CAD, the CAD defines the XYZIJK, but the XYZIJK are relative to the active, or current, alignment. That's all I was trying to say, maybe I wasn't very clear with my wording.
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