After inspecting a few parts the points on the CAD shift/move around on the CAD.

Hi,

Lately, this has been happening, and I don’t know why.

After inspecting a few parts, the points on the CAD shift/move around on the CAD. I am using an iterative alignment.
i Feel silly asking but has this happened to anyone, or why is it happening?

SKIP =LABEL/
C4 =COMMENT/INPUT,NO,FULL SCREEN=NO,
"SERIAL NUMBER"
ASSIGN/SN=C4.INPUT
STATS/ON,DATAPAGE+,,OFFLINE=YES
RECORD=DIMENSION,TRACE,FEATURE,FCF PROFILE,
TRACEFIELD/DISPLAY=NO,REPORT=NO,DISPLAY MESSAGE=New Trace ; JOB NUMBER : N52384
TRACEFIELD/DISPLAY=NO,REPORT=NO,DISPLAY MESSAGE=New Trace ; SERIAL NUMBER : C4.INPUT
FLY/ON
FASTPROBEMODE/ON
MOVESPEED/ 425
TOUCHSPEED/ 3
ITR_PNT1 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<-0.0202,9.6975,0.5038>,<-0.9562512,0.0186043,0.2919547>
ACTL/<-0.0205,9.6975,0.5036>,<-0.9562512,0.0186043,0.2919547>
TARG/<-0.0202,9.6975,0.5038>,<-0.9562512,0.0186043,0.2919547>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=NO
ITR_PNT2 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<-0.2256,6.1515,-0.5>,<-0.9983838,-0.008735,0.0561565>
ACTL/<-0.2254,6.1515,-0.5002>,<-0.9983838,-0.008735,0.0561565>
TARG/<-0.2256,6.1515,-0.5>,<-0.9983838,-0.008735,0.0561565>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=NO
MOVE/CLEARPLANE
ITR_PNT3 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<-0.3341,2.0783,0.5052>,<-0.9974083,0.0430655,0.0576365>
ACTL/<-0.3341,2.0783,0.505>,<-0.9974083,0.0430655,0.0576365>
TARG/<-0.3341,2.0783,0.5052>,<-0.9974083,0.0430655,0.0576365>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=NO
ITR_PNT4 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<-0.8703,0.7369,0>,<-0.0871557,0.9961947,-0.0000004>
ACTL/<-0.8702,0.7371,0>,<-0.0871557,0.9961947,-0.0000004>
TARG/<-0.8703,0.7369,0>,<-0.0871557,0.9961947,-0.0000004>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=NO
MOVE/CLEARPLANE
ITR_PNT5 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<-0.0348,1.0649,1.1338>,<0.0000001,0.029408,0.999567 5>
ACTL/<-0.0346,1.0651,1.1338>,<0.0000001,0.029408,0.999567 5>
TARG/<-0.0348,1.0649,1.1338>,<0.0000001,0.029408,0.999567 5>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=NO
MOVE/CLEARPLANE
ITR_PNT6 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<0.152,10.5127,0.6712>,<0.0000001,0.0447896,0.99 89 964>
ACTL/<0.1521,10.5127,0.6711>,<0.0000001,0.0447896,0.9 98 9964>
TARG/<0.152,10.5127,0.6712>,<0.0000001,0.0447896,0.99 89 964>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=NO
A1         =ALIGNMENT/START,RECALL:RGH_A3,LIST=YES
              ALIGNMENT/ITERATE
                PNT TARGET RAD=0.01,START LABEL=,FIXTURE TOL=0,ERROR LABEL=
                MEAS ALL FEAT=NO,LEVEL AXIS=XAXIS,ROTATE AXIS=ZAXIS,ORIGIN AXIS=YAXIS
              LEVEL=ITR_PNT1,ITR_PNT2,ITR_PNT3,,
              ROTATE=ITR_PNT5,ITR_PNT6,,
              ORIGIN=ITR_PNT4,,
            ALIGNMENT/END
CLEARP/ZPLUS,1.5,ZPLUS,0,OFF
MOVE/CLEARPLANE
PNT1 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<-0.2676,-1.233,-0.1793>,<-0.6460157,-0.6311847,-0.4292663>
ACTL/<-0.2056,-1.1613,-0.1443>,<-0.6460157,-0.6311847,-0.4292663>
TARG/<-0.2676,-1.233,-0.1793>,<-0.4637985,-0.8839508,-0.0593461>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=NO
PNT2 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<-0.3726,-0.8559,-0.1618>,<-0.9172444,0,-0.3983249>
ACTL/<-0.2603,-0.8538,-0.1289>,<-0.9172444,0,-0.3983249>
TARG/<-0.3726,-0.8559,-0.1618>,<-0.9974792,-0.05237,-0.0478811>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=NO
PNT3 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<-0.2989,-0.8661,-0.2751>,<-0.7358684,0,-0.6771245>
ACTL/<-0.2279,-0.8652,-0.2152>,<-0.7358684,0,-0.6771245>
TARG/<-0.2989,-0.8661,-0.2751>,<-0.8925628,-0.0675264,-0.4458384>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=NO
PNT4 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<-0.6245,-0.5108,-0.3642>,<-0.4160222,-0.8785537,-0.2346678>
ACTL/<-0.5953,-0.4607,-0.3467>,<-0.4160222,-0.8785537,-0.2346678>
TARG/<-0.6245,-0.5108,-0.3642>,<-0.1419954,-0.9895013,-0.026915>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=NO
MOVE/CLEARPLANE
PNT5 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<-1.098,0.075,0.5156>,<-0.8004995,-0.4684826,0.3737975>
ACTL/<-1.0159,0.1099,0.469>,<-0.8004995,-0.4684826,0.3737975>
TARG/<-1.098,0.075,0.5156>,<-0.7568698,0.0608489,0.6507269>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=NO
MOVE/CLEARPLANE
PNT6 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<-1.0929,0.0042,0.1277>,<-0.0871521,-0.9961531,0.0091439>
ACTL/<-1.0892,0.0241,0.1303>,<-0.0871521,-0.9961531,0.0091439>
TARG/<-1.0929,0.0042,0.1277>,<-0.0452946,-0.9972984,0.05783>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=NO
MOVE/CLEARPLANE
PNT7 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<-0.9509,0.0131,-0.6409>,<-0.3287015,-0.9197569,-0.214482>
ACTL/<-0.9287,0.0354,-0.6259>,<-0.3287015,-0.9197569,-0.214482>
TARG/<-0.9509,0.0131,-0.6409>,<-0.0588313,-0.9978335,-0.0294486>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=NO
MOVE/CLEARPLANE
PNT8 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<-1.1373,0.5955,0.4635>,<-0.9219012,0.0959886,0.3753457>
ACTL/<-1.0469,0.5881,0.4098>,<-0.9219012,0.0959886,0.3753457>
TARG/<-1.1373,0.5955,0.4635>,<-0.6165628,0,0.7873057>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=NO
MOVE/CLEARPLANE
TIP/T1A0B0, SHANKIJK=-0.0002, 0, 1, ANGLE=0.0033
MOVE/CLEARPLANE
PNT9 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<0.3432,-1.1834,-0.0948>,<0.8351247,-0.4998306,-0.2296433>
ACTL/<0.4301,-1.2376,-0.0768>,<0.8351247,-0.4998306,-0.2296433>
TARG/<0.3432,-1.1834,-0.0948>,<0.8527401,-0.5223355,-0.0000809>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=NO
PNT10 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<0.5705,-0.5183,0.4196>,<0.302545,-0.9295854,0.2105647>
ACTL/<0.6979,-0.4458,0.517>,<0.302545,-0.9295854,0.2105647>
TARG/<0.5705,-0.5183,0.4196>,<0.7970385,0,0.6039284>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=NO
PNT11 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<0.397,-0.7978,-0.0864>,<0.9771399,0,-0.2125974>
ACTL/<0.5213,-0.7978,-0.0779>,<0.9771399,0,-0.2125974>
TARG/<0.397,-0.7978,-0.0864>,<0.9991688,0,-0.0407646>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=NO
PNT12 =FEAT/CONTACT/VECTOR POINT/DEFAULT,CARTESIAN
THEO/<0.4062,-0.789,0.0066>,<0.9998678,0,0.0162591>
ACTL/<0.4062,-0.789,0.0066>,<0.0871525,-0.9961579,0.0085898>
TARG/<0.4062,-0.789,0.0066>,<0.0871525,-0.9961579,0.0085898>
SNAP=NO
SHOW FEATURE PARAMETERS=NO
SHOW CONTACT PARAMETERS=NO
MOVE/CLEARPLANE

jccmm201 over 2 years ago

Apparently it is an alignment error. What is the "RGH_A3" alignment you have recalled??
When you apply Iterative alignment, use 3 points (your ITR_ point 1, 2, 3) as level, and 2 points (your ITR_point 5, 6) as rotation, and 1 point (your ITR_point 4).
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MikeD6 over 2 years ago

Which points are moving? The alignment points or the inspection points? Are the nominals actually changing in your code?
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ProbFlex over 2 years ago in reply to jccmm201

Hi, Thank you.

The whole program didn't fit, so I only inter the final alignment. Which, most of the time, is the same as the rough alignment.

Yes, that is how I am using 3,2,1 Iterative alignment.

"RGH_A3" is a Rough alignment. First actual alignment for the machine to find part. The final alignment is A1. I even changed the final alignment from recalling "RGH_A3" to startup. Still the same issue.
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MikeD6 over 2 years ago

It looks like all your nominals are different to me. Is there any chance one of your alignment points changed and it changed your nominals as a result?
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ProbFlex over 2 years ago

@ MikeD6

It is the inspection point that is moving.

The green dots ignore. Engineering adds them. Hopefully, the pictures help. The inspection points are tiny dots, not green ones. But maybe it is visible in the program from the pictures.
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MikeD6 over 2 years ago

I can see your inspection points are moving. I was reading your nominal values side by side, and it looks like they are all different. Here's what could've happened, based on what I've seen. You changed your iterative alignment, maybe the point locations or the number of features you want to use. When you do that, you get a popup message that asks of you want to change the nominals for everything past your updated alignment. You should ALWAYS click no. If you click yes it'll shift your nominals just a little bit. Its an easy mistake to make, I've done it myself. Also, you can use as many points as you want to do an iterative alignment, you aren't limited to 3-2-1. I've used up to a 20 points when I was measuring castings to create iterative alignments.
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jccmm201 over 2 years ago

Hmm... your part is NOT a square shape which is not proper to use Iterative alignment i think.
Instead, whay don't you select the cylinder(with 2 circles) and shoulder as alignment features in order to get precise/ accurate alignment.
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ProbFlex over 2 years ago in reply to MikeD6

Is it possible to create a loop alignment to continue probing til it finds or gets as close as possible to the point alignment within the .010 zone?
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ProbFlex over 2 years ago in reply to jccmm201

I did try that alignment method. It didn't work very well because I couldn't find the cover surfaces because of no clocking.
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MikeD6 over 2 years ago in reply to MikeD6

Iterative alignments will loop automatically if you set them up to. There is a checkbox for a "Measure all always" and a box for max iterations, the default value is 3. That's typically enough. Is there anything special about the alignment points you're choosing, like they're a datum target or something?
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