Read Point Feature

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  • Read Point Feature

    I want to use the READ POINT feature to determine where the probe is currently located in the CMM Space AND I want to do this under DCC control. How accurate is this and is there a way to make the machine dwell while I take this reading?

    Lets say that I have just measured a circle and the probe comes to rest after the final touch, then I take a read point. Is this Read Point taken on the fly as the probe is still moving or does the machine come to a halt before taking the point or is there a way to put a pause in to get this reading more accurately (accuracy in the range of ±.05").
    Links to my utilities for PCDMIS

  • #2
    It should take the readpoint at completion of retract. You could give it a movepoint increment of 0, 0, 0 perhaps. I do not know if that will help or not. Fly mode I susspect would make things interesting.
    <internet bumper sticker goes here>

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    • #3
      Ok, the Move Increment would give me some dwell
      Links to my utilities for PCDMIS

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      • #4
        cmmguy,

        Just curious, what / why do you want to do something of this nature??
        Please explain.

        ZydecoPete
        sigpic

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        • #5
          In my experience readpoints are best for starting off programs so you can go straight into DCC mode.
          sigpic.....Its called golf because all the other 4 letter words were taken

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          • #6
            Originally posted by Peter Warcholyk View Post
            cmmguy,

            Just curious, what / why do you want to do something of this nature??
            Please explain.

            ZydecoPete
            Fair question.

            -Old habits maybe.
            -I dont completely trust Clearplane to do as advertised.
            -I need to move to specific location in a single axis only (there is no ability to do a single axis move in PCDMIS.
            -I write parametric programs and instead of always figuring things out completely, I can move around the part without hitting things.
            -I also write completely automated programs (no operator intervention) and at the beginning of the program I like to make sure the CMM is in the right location before movement starts. You know, maybe the last part did not complete properly and the CMM is somewhere I dont want it.

            Maybe there are other ways to do this and I am interested in knowing them. This is just one way that I have gotten used to.

            Originally posted by bw_bob View Post
            In my experience readpoints are best for starting off programs so you can go straight into DCC mode.
            Yes that is the traditional reason. It started on the Sheffield's and to stay competitive, I think it was later added to PCDMIS. And I use it that way also.
            Last edited by cmmguy; 12-19-2006, 11:27 AM.
            Links to my utilities for PCDMIS

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            • #7
              Try this

              We do what you are asking every day and do not use any dwell.
              MODE/DCC
              MOVE/POINT,NORMAL,2516.3396,733.6685,-642.0497
              MOVE/POINT,NORMAL,2516.3333,461.7372,-642.0447
              MOVE/POINT,NORMAL,2948.9709,461.5702,-642.0598
              MOVE/POINT,NORMAL,2952.4717,720.213,-832.5316
              MOVE/POINT,NORMAL,2947.1987,720.2316,-832.5316
              $$ NO,NEW START
              L4 =LABEL/
              WORKPLANE/XPLUS
              PNT1 =FEAT/POINT,RECT
              THEO/911.4438,251.2988,-746.2958,0,0,1
              ACTL/2947.1987,720.2316,-832.5316,0,0,1
              READPOINT/
              MODE/DCC
              A0 =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
              ALIGNMENT/TRANS,XAXIS,PNT1
              ALIGNMENT/TRANS,YAXIS,PNT1
              ALIGNMENT/TRANS,ZAXIS,PNT1
              ALIGNMENT/END
              CIR1 =AUTO/CIRCLE,SHOWALLPARAMS = NO,SHOWHITS = NO
              THEO/0,0,0,1,0,0,17
              ACTL/0.355,0.0383,-0.638,0.9993397,0.0355762,-0.0073848,17.0016
              TARG/0,0,0,1,0,0
              A1 =ALIGNMENT/START,RECALL:A0,LIST=YES
              ALIGNMENT/TRANS,XAXIS,CIR1
              ALIGNMENT/TRANS,YAXIS,CIR1
              ALIGNMENT/TRANS,ZAXIS,CIR1
              ALIGNMENT/END

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              • #8
                Thanks for your reply.

                Without any type of dwell, how well does the ReadPoint grab the position during dcc moves. In your example, you have stabilized Y and Z and then only move the X 5mm. If you were to move XYZ about 30mm at the same time and then grabbed the ReadPoint, how close would the ReadPoint be to the last MovePoint executed?

                Thanks
                Links to my utilities for PCDMIS

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                • #9
                  It seems to grab the move point numbers for the readpoint and have had no problems so far. It is close enough that I can put a 2mm tip into a a 2.35 hole on one prg I run.

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