Probe comp problem

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  • Probe comp problem

    I was running a check on my CMM for the new production manager, and a wierd thing started happening. I am measuring a caliper calibration master with (3) different programs, and the same thing is happening in all (3) programs. It seems that the probe compisation is doubleing on some hits. I am using a 4MM probe, and I am taking a line (2 points) and then a single hit in the middle of the (2) for the line. The Z comes out pretty good for the line, but the point is reading 0.079" off in Z when it is compared to the line, or about 2MM. Anyone have any idea what is causing this? It is repeating these results. Also, the system has crashed twice tonight, which may have something to do with it, but I don't know. The code is as follows for one of the mysteriousreadings.

    5.0001LINE =FEAT/LINE,RECT,UNBND
    THEO/-0.5937,0.0138,-5.0001,0.9999981,0,-0.0019267
    ACTL/-0.604,0.0264,-5.003,1,0,-0.0001974
    MEAS/LINE,2,WORKPLANE
    HIT/BASIC,NORMAL,-0.6071,-0.0001,-5.0028,-0.0019267,0,-0.9999981,-0.604,0.0266,-5.003,USE THEO = YES
    HIT/BASIC,NORMAL,0.1926,0.0291,-5.0119,-0.0019267,0,-0.9999981,0.1722,0.0263,-5.0031,USE THEO = YES
    ENDMEAS/
    5.0001PT =FEAT/POINT,RECT
    THEO/-0.0155,0.0183,-5.0001,-1,0,0
    ACTL/-0.0899,0.0264,-5.0814,-1,0,0
    MEAS/POINT,1
    HIT/BASIC,NORMAL,-0.0155,0.0183,-5.0816,-1,0,0,-0.0899,0.0264,-5.0814,USE THEO = YES
    ENDMEAS/
    Steven69
    sigpic

  • #2
    Originally posted by Steven69 View Post
    I was running a check on my CMM for the new production manager, and a wierd thing started happening. I am measuring a caliper calibration master with (3) different programs, and the same thing is happening in all (3) programs. It seems that the probe compisation is doubleing on some hits. I am using a 4MM probe, and I am taking a line (2 points) and then a single hit in the middle of the (2) for the line. The Z comes out pretty good for the line, but the point is reading 0.079" off in Z when it is compared to the line, or about 2MM. Anyone have any idea what is causing this? It is repeating these results. Also, the system has crashed twice tonight, which may have something to do with it, but I don't know. The code is as follows for one of the mysteriousreadings.

    Code:
    5.0001LINE =FEAT/LINE,RECT,UNBND
                THEO/-0.5937,0.0138,-5.0001,0.9999981,0,-0.0019267
                ACTL/-0.604,0.0264,-5.003,1,0,-0.0001974
                MEAS/LINE,2,WORKPLANE
                HIT/BASIC,NORMAL,-0.6071,-0.0001,-5.0028,-0.0019267,0,-0.9999981,-0.604,0.0266,-5.003,USE THEO = YES
                HIT/BASIC,NORMAL,0.1926,0.0291,-5.0119,-0.0019267,0,-0.9999981,0.1722,0.0263,-5.0031,USE THEO = YES
                ENDMEAS/
    5.0001PT   =FEAT/POINT,RECT
                THEO/-0.0155,0.0183,-5.0001,-1,0,0
                ACTL/-0.0899,0.0264,-5.0814,-1,0,0
                MEAS/POINT,1
                HIT/BASIC,NORMAL,-0.0155,0.0183,-5.0816,-1,0,0,-0.0899,0.0264,-5.0814,USE THEO = YES
                ENDMEAS/  :eek:
    Code:
    
    
    It looks like the vector for the point is incorrect for the line you are measuring it on. The vector for the point should be the same as for the hits of the line if you want the point 'comped' into the line.
    sigpic
    Originally posted by AndersI
    I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

    Comment


    • #3
      I think Matt has it right, good eyes Matt.
      GLOBAL FX 12-15-10
      3.7MR3, XP/SP2
      EXCEL 12-20-10, 9-12-9, 7-10-7

      Comment


      • #4
        Originally posted by BOB PARSONS View Post
        I think Matt has it right, good eyes Matt.
        Well, it was easier with the []code stuff, I did that in my reply, then before posting, I preview it so I could see it like I was looking at Pcdmis.

        [code] goes before and [/code] goes after Pcdmis edit window code and it will look like Pcdmis

        Then, once it looked right, I was able to spot that pretty quick.
        sigpic
        Originally posted by AndersI
        I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

        Comment


        • #5
          Nice useage ot the [noparse][/noparse] tags by the way
          <internet bumper sticker goes here>

          Comment


          • #6
            Originally posted by craiger_ny View Post
            Nice useage ot the [noparse][/noparse] tags by the way
            bite-me, boogerboy. We all gotta learn something sometime. I thought about doing it the way I used to just to see if I could get a rise out of you, then I thought about poor Paul(a) and what happened to him/her when he/she got a rise out of you. By the way, has he/she started walking upright again?
            sigpic
            Originally posted by AndersI
            I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

            Comment


            • #7
              Originally posted by Matthew D. Hoedeman View Post
              bite-me, boogerboy. We all gotta learn something sometime. I thought about doing it the way I used to just to see if I could get a rise out of you, then I thought about poor Paul(a) and what happened to him/her when he/she got a rise out of you. By the way, has he/she started walking upright again?
              You flatter me
              <internet bumper sticker goes here>

              Comment


              • #8
                Is this RESOLVED ? ? ?
                sigpic
                Xcel 15-20-10 - PFXcel 7-6-5 - Merlin 11-11-7 - Romer Absolute 7525SI
                PCDMIS 2012
                Windows Office XP

                Comment


                • #9
                  Originally posted by rangerboat72 View Post
                  Is this RESOLVED ? ? ?
                  No, it is not resolved. Here are (2) morefeatures checked. Again, this is a 2 point line, and then a point is taken between the first 2. The vectors are the same, yet the 'X' positions are 0.078" off!

                  10.9973LINE=FEAT/LINE,RECT,UNBND
                  THEO/10.9973,0.1279,1.953,0,1,0
                  ACTL/10.9979,0.0699,1.9601,0.0001852,1,0
                  MEAS/LINE,2,WORKPLANE
                  HIT/BASIC,NORMAL,10.9981,0.1217,1.953,1,0.0002171,0,10 .9979,0.0699,1.9601,USE THEO = YES
                  HIT/BASIC,NORMAL,10.9979,0.8121,1.9529,1,0.0002171,0,10.9981,0.8809,1.9601 ,USE THEO = YES
                  ENDMEAS/
                  10.9973PT =FEAT/POINT,RECT
                  THEO/10.9973,0.4021,1.953,0,1,0
                  ACTL/11.0759,0.4316,1.9601,0,1,0
                  MEAS/POINT,1
                  HIT/BASIC,NORMAL,11.0761,0.4021,1.953,0,1,0,11.0759,0.4316,1.9601,USE THEO = YES
                  ENDMEAS/
                  Steven69
                  sigpic

                  Comment


                  • #10
                    Why is the vector of your point in the +Y direction?

                    The vectors on the hits reflect direction away from the surface.
                    The vectors on the feature represent feature direction.
                    Points dont have a feature vector but their hits do.
                    The point between the line should have a hit vector of 1,0,0 not 0,1,0
                    Last edited by cmmguy; 08-30-2007, 11:38 PM.
                    Links to my utilities for PCDMIS

                    Comment


                    • #11
                      Originally posted by Steven69 View Post
                      No, it is not resolved. Here are (2) morefeatures checked. Again, this is a 2 point line, and then a point is taken between the first 2. The vectors are the same, yet the 'X' positions are 0.078" off!

                      10.9973LINE=FEAT/LINE,RECT,UNBND
                      THEO/10.9973,0.1279,1.953,0,1,0
                      ACTL/10.9979,0.0699,1.9601,0.0001852,1,0
                      MEAS/LINE,2,WORKPLANE
                      HIT/BASIC,NORMAL,10.9981,0.1217,1.953,1,0.0002171,0,10 .9979,0.0699,1.9601,USE THEO = YES
                      HIT/BASIC,NORMAL,10.9979,0.8121,1.9529,1,0.0002171,0,10.9981,0.8809,1.9601 ,USE THEO = YES
                      ENDMEAS/
                      10.9973PT =FEAT/POINT,RECT
                      THEO/10.9973,0.4021,1.953,0,1,0
                      ACTL/11.0759,0.4316,1.9601,0,1,0
                      MEAS/POINT,1
                      HIT/BASIC,NORMAL,11.0761,0.4021,1.953,0,1,0,11.0759,0.4316,1.9601,USE THEO = YES
                      ENDMEAS/
                      DON'T LOOK AT THE VECTOR of the LINE and the vector of the POINT, THOSE should NOT be the same, HOWEVER, the VECTORS of the line HITS and the vector of the POINT MUST be the same if the point is on the line, those are NOT.
                      sigpic
                      Originally posted by AndersI
                      I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

                      Comment


                      • #12
                        Originally posted by cmmguy View Post
                        Why is the vector of your point in the +Y direction?

                        The vectors on the hits reflect direction away from the surface.
                        The vectors on the feature represent feature direction.
                        Points dont have a feature vector but their hits do.
                        The point between the line should have a hit vector of 1,0,0 not 0,1,0
                        I'll be Da*ned!! You are correct, sir. I went thru the code on three programs that I had written that night, and for some reason, the vectors on some of the points were switch!! Now I just have to figure out why they were switched. These were manual programs, so the hits I took were coming from the same direction, yet only a couple had the vectors messed up!!! Thanks much!!!
                        Steven69
                        sigpic

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