"Cannot find Nominals"

My problem is, is that the programmers are saying that hitting No and No on the Dialogue boxes will not result in any issue or compromisation to the Part being measured. From what is being said above this is not the case. So unfortunately, it is this forum that is helping me understand what is going on with the issue.

If you hit "No" and "No" it means that you are electing not to increase the FindNominals tolerance and are also electing not to delete the hits for which nominals could not be found. So now you will have hits in your scan that you know full well do not have correctly associated nominal values. I'm not going to say that there is never an application where this will make sense but it will be exceedingly rare for this to be the best strategy.

In almost all situations you either need to say "Yes" to the first dialogue and find a tolerance that works or say "No" to the first one and then say "Yes" to the second one so that you delete the hits that do not have proper nominals.

Of these two options the first one is the most often the best approach. The second option should only be done if you are absolutely sure you know what you are doing and what the consequences will be.

I have, on occasion, employed the second strategy as a way to trim scans right to the edge of a specific surface but that is a very specific, and likely not a very typical, situation.

Hi,

I am facing similar kind of issue. However in my case, I am not seeing any dialogue box but when I finish a scan and use XactMeasure to report the output, I get deviation as .001". if I hit F9 and click on GET NOMINALS and click OK to close edit box, PC-DMIS ask me if I want to update nominals. If I click YES, the profile output rose to 0.063" in deviation. I am using a 3mm probe or (.118" dia or .059" radius).

Is PC-DMIS gets confused on calculating the output? Which results should I trust? .001" or .063"? I am also posting before and after code.

before hitting GET NOMINALS:

CORNER=FEAT/SCAN,MANUAL FREEFORM,,SHOW HITS=YES,SHOWALLPARAMS=NO
MEAS/SCAN
BASICSCAN/LINE,NUMBER OF HITS=28,SHOW HITS=YES,SHOWALLPARAMS=NO
HIT/BASIC,<4.017,-7.766,8.645>,<0.7921831,-0.0053097,-0.6102605>,<4.062,-7.766,8.61>,T=0.057
HIT/BASIC,<4.045,-7.678,8.681>,<0.7921831,-0.0053097,-0.6102605>,<4.091,-7.679,8.645>,T=0.058
HIT/BASIC,<4.074,-7.585,8.717>,<0.7921831,-0.0053097,-0.6102605>,<4.12,-7.585,8.681>,T=0.058
HIT/BASIC,<4.102,-7.491,8.753>,<0.7921831,-0.0053097,-0.6102605>,<4.148,-7.492,8.717>,T=0.058
HIT/BASIC,<4.136,-7.384,8.796>,<0.7921831,-0.0053097,-0.6102605>,<4.182,-7.384,8.76>,T=0.058
HIT/BASIC,<4.168,-7.282,8.836>,<0.7921831,-0.0053097,-0.6102605>,<4.214,-7.282,8.801>,T=0.058
HIT/BASIC,<4.215,-7.129,8.897>,<0.7921831,-0.0053097,-0.6102605>,<4.261,-7.129,8.861>,T=0.058
HIT/BASIC,<4.244,-7.038,8.933>,<0.7921831,-0.0053097,-0.6102605>,<4.29,-7.038,8.898>,T=0.058
HIT/BASIC,<4.274,-6.944,8.971>,<0.7921831,-0.0053097,-0.6102605>,<4.32,-6.944,8.936>,T=0.058
HIT/BASIC,<4.367,-6.645,9.09>,<0.7921831,-0.0053097,-0.6102605>,<4.413,-6.645,9.054>,T=0.058
HIT/BASIC,<4.443,-6.402,9.186>,<0.7921831,-0.0053097,-0.6102605>,<4.489,-6.402,9.151>,T=0.058
HIT/BASIC,<4.51,-6.19,9.271>,<0.7921831,-0.0053097,-0.6102605>,<4.556,-6.19,9.235>,T=0.058
HIT/BASIC,<4.552,-6.055,9.325>,<0.7921831,-0.0053097,-0.6102605>,<4.598,-6.055,9.289>,T=0.058
HIT/BASIC,<4.598,-5.907,9.383>,<0.7921831,-0.0053097,-0.6102605>,<4.644,-5.907,9.348>,T=0.058
HIT/BASIC,<4.662,-5.707,9.463>,<0.7921831,-0.0053097,-0.6102605>,<4.707,-5.707,9.428>,T=0.058
HIT/BASIC,<4.701,-5.581,9.514>,<0.7921831,-0.0053097,-0.6102605>,<4.747,-5.581,9.479>,T=0.058
HIT/BASIC,<4.73,-5.489,9.551>,<0.7921831,-0.0053097,-0.6102605>,<4.776,-5.49,9.516>,T=0.058
HIT/BASIC,<4.763,-5.384,9.592>,<0.7921831,-0.0053097,-0.6102605>,<4.809,-5.384,9.557>,T=0.058
HIT/BASIC,<4.791,-5.294,9.628>,<0.7921831,-0.0053097,-0.6102605>,<4.837,-5.295,9.593>,T=0.058
HIT/BASIC,<4.828,-5.179,9.674>,<0.7921831,-0.0053097,-0.6102605>,<4.873,-5.18,9.639>,T=0.058
HIT/BASIC,<4.868,-5.051,9.725>,<0.7921831,-0.0053097,-0.6102605>,<4.913,-5.052,9.69>,T=0.058
HIT/BASIC,<4.987,-4.673,9.877>,<0.7921831,-0.0053097,-0.6102605>,<5.032,-4.673,9.842>,T=0.057
HIT/BASIC,<5.115,-4.264,10.04>,<0.7921831,-0.0053097,-0.6102605>,<5.16,-4.264,10.005>,T=0.057
HIT/BASIC,<5.214,-3.949,10.166>,<0.7921831,-0.0053097,-0.6102605>,<5.259,-3.95,10.131>,T=0.057
HIT/BASIC,<5.314,-3.632,10.292>,<0.7921831,-0.0053097,-0.6102605>,<5.359,-3.632,10.258>,T=0.056
HIT/BASIC,<5.357,-3.497,10.347>,<0.7921831,-0.0053097,-0.6102605>,<5.401,-3.497,10.313>,T=0.056
HIT/BASIC,<5.459,-3.17,10.477>,<0.7921831,-0.0053097,-0.6102605>,<5.503,-3.171,10.443>,T=0.056
HIT/BASIC,<5.556,-2.866,10.6>,<0.7921831,-0.0053097,-0.6102605>,<5.599,-2.866,10.566>,T=0.055
ENDSCAN
ENDMEAS/

deviation is .004"

after hitting GET NOMINALS:

WIN1 STEP CORNER=FEAT/SCAN,MANUAL FREEFORM,,SHOW HITS=YES,SHOWALLPARAMS=NO
MEAS/SCAN
BASICSCAN/LINE,NUMBER OF HITS=28,SHOW HITS=YES,SHOWALLPARAMS=NO
HIT/BASIC,<4.039,-7.747,8.521>,<0.5416752,-0.4545195,0.7071068>,<4.062,-7.766,8.61>,T=0.084
HIT/BASIC,<4.068,-7.659,8.555>,<0.5416752,-0.4545195,0.7071068>,<4.091,-7.679,8.645>,T=0.085
HIT/BASIC,<4.097,-7.566,8.592>,<0.5416752,-0.4545195,0.7071068>,<4.12,-7.585,8.681>,T=0.084
HIT/BASIC,<4.127,-7.473,8.63>,<0.5416752,-0.4545195,0.7071068>,<4.148,-7.492,8.717>,T=0.082
HIT/BASIC,<4.16,-7.366,8.673>,<0.5416752,-0.4545195,0.7071068>,<4.182,-7.384,8.76>,T=0.082
HIT/BASIC,<4.192,-7.264,8.714>,<0.5416752,-0.4545195,0.7071068>,<4.214,-7.282,8.801>,T=0.082
HIT/BASIC,<4.24,-7.112,8.775>,<0.5416752,-0.4545195,0.7071068>,<4.261,-7.129,8.861>,T=0.081
HIT/BASIC,<4.269,-7.021,8.811>,<0.5416752,-0.4545195,0.7071068>,<4.29,-7.038,8.898>,T=0.081
HIT/BASIC,<4.299,-6.926,8.849>,<0.5416752,-0.4545195,0.7071068>,<4.32,-6.944,8.936>,T=0.081
HIT/BASIC,<4.393,-6.628,8.969>,<0.5416752,-0.4545195,0.7071068>,<4.413,-6.645,9.054>,T=0.079
HIT/BASIC,<4.47,-6.385,9.066>,<0.5416752,-0.4545195,0.7071068>,<4.489,-6.402,9.151>,T=0.078
HIT/BASIC,<4.536,-6.174,9.151>,<0.5416752,-0.4545195,0.7071068>,<4.556,-6.19,9.235>,T=0.078
HIT/BASIC,<4.579,-6.039,9.205>,<0.5416752,-0.4545195,0.7071068>,<4.598,-6.055,9.289>,T=0.077
HIT/BASIC,<4.625,-5.891,9.264>,<0.5416752,-0.4545195,0.7071068>,<4.644,-5.907,9.348>,T=0.076
HIT/BASIC,<4.688,-5.692,9.344>,<0.5416752,-0.4545195,0.7071068>,<4.707,-5.707,9.428>,T=0.077
HIT/BASIC,<4.728,-5.566,9.395>,<0.5416752,-0.4545195,0.7071068>,<4.747,-5.581,9.479>,T=0.076
HIT/BASIC,<4.757,-5.474,9.432>,<0.5416752,-0.4545195,0.7071068>,<4.776,-5.49,9.516>,T=0.077
HIT/BASIC,<4.79,-5.369,9.474>,<0.5416752,-0.4545195,0.7071068>,<4.809,-5.384,9.557>,T=0.076
HIT/BASIC,<4.818,-5.279,9.51>,<0.5416752,-0.4545195,0.7071068>,<4.837,-5.295,9.593>,T=0.076
HIT/BASIC,<4.855,-5.164,9.556>,<0.5416752,-0.4545195,0.7071068>,<4.873,-5.18,9.639>,T=0.076
HIT/BASIC,<4.895,-5.036,9.607>,<0.5416752,-0.4545195,0.7071068>,<4.913,-5.052,9.69>,T=0.075
HIT/BASIC,<5.014,-4.658,9.759>,<0.5416752,-0.4545195,0.7071068>,<5.032,-4.673,9.842>,T=0.075
HIT/BASIC,<5.143,-4.249,9.923>,<0.5416752,-0.4545195,0.7071068>,<5.16,-4.264,10.005>,T=0.074
HIT/BASIC,<5.242,-3.935,10.049>,<0.5416752,-0.4545195,0.7071068>,<5.259,-3.95,10.131>,T=0.074
HIT/BASIC,<5.342,-3.618,10.177>,<0.5416752,-0.4545195,0.7071068>,<5.359,-3.632,10.258>,T=0.073
HIT/BASIC,<5.384,-3.483,10.231>,<0.5416752,-0.4545195,0.7071068>,<5.401,-3.497,10.313>,T=0.074
HIT/BASIC,<5.487,-3.157,10.362>,<0.5416752,-0.4545195,0.7071068>,<5.503,-3.171,10.443>,T=0.072
HIT/BASIC,<5.582,-2.852,10.485>,<0.5416752,-0.4545195,0.7071068>,<5.599,-2.866,10.566>,T=0.073
ENDSCAN
ENDMEAS/

deviation is .066"

I didn't change the scan in meantime. I don't understand where it the error coming from.

I can't upload picture of edit window due to usergroup's data limit. it says I only have 10.9KB left out of 1MB. What is that?

I found the answer. My probe compensation was turned off in my edit window. I am not sure why though as I never changed it.