z axis moves when checking od

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  • z axis moves when checking od

    Does anyone know why the z axis will move down when the machine is moving between points when measuring an od? If the od isn't very far above a face this will sometimes make the probe take a hit on the face. Is there any way to make the z axis stay in the same place while it is moving? If it is helpful I am using a ONE machine with version 4.1 and a sheffiled controller.

    Thanks to all in advance.

  • #2
    Is this a learned feature or an AUTO FEATURE? If it is a learned feature, it will take the hits at the same height YOU did when you learned it.
    sigpic
    Originally posted by AndersI
    I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

    Comment


    • #3
      It doesn't seem to matter. It does it with both. The z moves down, moves to the location of the next hit, moves back up, and then takes the hit.

      Comment


      • #4
        Originally posted by rdbowman View Post
        Does anyone know why the z axis will move down when the machine is moving between points when measuring an od? If the od isn't very far above a face this will sometimes make the probe take a hit on the face. Is there any way to make the z axis stay in the same place while it is moving? If it is helpful I am using a ONE machine with version 4.1 and a sheffiled controller.

        Thanks to all in advance.
        Could be several things. First, check to ensure your feature's vector is appropriate to the alignment.

        If it is an autofeature and not on a thread, the pitch should be set at 0 in the autofeature window.

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        • #5
          Originally posted by rdbowman View Post
          It doesn't seem to matter. It does it with both. The z moves down, moves to the location of the next hit, moves back up, and then takes the hit.
          That is odd. Can you post the code for this circle?

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          • #6
            vector looks right and the pitch is set to 0.

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            • #7
              82.30mm_od =auto/circle,showallparams = No,showhits = Yes
              Theo/0,0,2.029,0.0000458,0.0000344,1,3.24,-0.8
              Actl/-0.0003,-0.0059,2.029,0.0000458,0.0000344,1,3.2365,-0.8
              Targ/0,0,2.029,0.0000458,0.0000344,1
              Meas/circle
              Hit/basic,1.619,0.0565,2.0289,0.9993908,0.0348995,-0.000047,1.6167,0.0564,2.0289
              Hit/basic,1.4416,0.7391,2.0289,0.8898718,0.4562107,-0.0000564,1.4374,0.7371,2.0289
              Hit/basic,0.991,1.2815,2.0289,0.6117243,0.791071,-0.0000552,0.9871,1.2764,2.0289
              Hit/basic,0.3526,1.5812,2.0289,0.2176566,0.9760254,-0.0000435,0.3509,1.5738,2.0289
              Hit/basic,-0.3526,1.5812,2.029,-0.2176566,0.9760254,-0.0000236,-0.351,1.5737,2.029
              Hit/basic,-0.991,1.2815,2.029,-0.6117243,0.791071,0.0000008,-0.9873,1.2766,2.029
              Hit/basic,-1.4416,0.7391,2.029,-0.8898718,0.4562107,0.0000251,-1.4379,0.7369,2.029
              Hit/basic,-1.619,0.0565,2.0291,-0.9993908,0.0348995,0.0000446,-1.6175,0.0569,2.0291
              Endmeas/

              Comment


              • #8
                Originally posted by rdbowman View Post
                Code:
                82.30mm_od =auto/circle,showallparams = No,showhits = Yes
                            Theo/0,0,2.029,0.0000458,0.0000344,1,3.24,-0.8
                            Actl/-0.0003,-0.0059,2.029,0.0000458,0.0000344,1,3.2365,-0.8
                            Targ/0,0,2.029,0.0000458,0.0000344,1
                            Meas/circle
                            Hit/basic,1.619,0.0565,2.0289,0.9993908,0.0348995,-0.000047,1.6167,0.0564,2.0289
                            Hit/basic,1.4416,0.7391,2.0289,0.8898718,0.4562107,-0.0000564,1.4374,0.7371,2.0289
                            Hit/basic,0.991,1.2815,2.0289,0.6117243,0.791071,-0.0000552,0.9871,1.2764,2.0289
                            Hit/basic,0.3526,1.5812,2.0289,0.2176566,0.9760254,-0.0000435,0.3509,1.5738,2.0289
                            Hit/basic,-0.3526,1.5812,2.029,-0.2176566,0.9760254,-0.0000236,-0.351,1.5737,2.029
                            Hit/basic,-0.991,1.2815,2.029,-0.6117243,0.791071,0.0000008,-0.9873,1.2766,2.029
                            Hit/basic,-1.4416,0.7391,2.029,-0.8898718,0.4562107,0.0000251,-1.4379,0.7369,2.029
                            Hit/basic,-1.619,0.0565,2.0291,-0.9993908,0.0348995,0.0000446,-1.6175,0.0569,2.0291
                            Endmeas
                /
                Well, your Z heights for each hit ARE a little off and your vector is NOT straight in Z. Those little difference CAN make a BIG difference.
                sigpic
                Originally posted by AndersI
                I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

                Comment


                • #9
                  Originally posted by rdbowman View Post
                  It doesn't seem to matter. It does it with both. The z moves down, moves to the location of the next hit, moves back up, and then takes the hit.
                  if it IS an Auto Feature, check the "AUTO" settings "MOVE", i had that problem the other week. Move "before and after" created a "pecking" effect.

                  HIH

                  Comment


                  • #10
                    Are you taking sample hits?
                    sigpic
                    Xcel 15-20-10 - PFXcel 7-6-5 - Merlin 11-11-7 - Romer Absolute 7525SI
                    PCDMIS 2012
                    Windows Office XP

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                    • #11
                      On a learned circle I found if I change the number of hits - it fixed the z so they all hit at the same depth
                      sigpic
                      if you had soap on a rope it would be tied to yer ankle

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                      • #12
                        Originally posted by T Miller View Post
                        On a learned circle I found if I change the number of hits - it fixed the z so they all hit at the same depth
                        I thought you also had to give it the Z axis value you wanted as well as tell it to equally space the hits for that to work, at least, that is what I do....
                        sigpic
                        Originally posted by AndersI
                        I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

                        Comment


                        • #13
                          I think all his hits are close enough to the same Z. I think maybe we missed the problem. His hits are being taken in the same Z but in between the hits it is moving funny. So, it takes hit 1 at z=2.029 and then moves to something like z=2.229, then moves to the next hit location (x,y), then down to z=2.029 and takes a hit.

                          It seems almost like it has clearplane moves in between the hits but I don't know how that can be done in an autocircle.

                          rdbowman, Do you have a clearplane set?

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                          • #14
                            there is a clear plane set but it is roughly 4.000 above where I am measuring the circle at. The z is only moving around .010 to .020 in the - direction but the od isn't very tall so it's enough to make the probe it the face below the od. Would changing my k vector to 0 help?

                            Comment


                            • #15
                              Originally posted by rdbowman View Post
                              there is a clear plane set but it is roughly 4.000 above where I am measuring the circle at. The z is only moving around .010 to .020 in the - direction but the od isn't very tall so it's enough to make the probe it the face below the od. Would changing my k vector to 0 help?
                              It might, you can probably figure out based on your prehit distance what that k vector difference would cause for probe movement.

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