Probe Tip > CREATING > Probe.dat

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  • Probe Tip > CREATING > Probe.dat

    I need to create and use a cylinder tip with a flat bottom. I need to be able to touch on flat bottom and on diameter side. I added this tip to probe.dat file for a 3mm diameter x 40mm total length:

    ITEM:TIP3BY40MMSHNK M2
    begintip
    ribcount 10
    color 142 142 142
    cylinder 0 0 0 0 0 -3 3
    cone 0 0 -3 3 0 0 -10 2
    color 255 0 0
    cylinder 0 0 -10 0 0 -40 3
    hotspot 0 0 -40 0 0 1 3 30 shank
    endtip

    Problem is I cannout get tip to work on flat bottom and on diameter side with one entry. When I change the hotspot 3 to 0 it works on the flat bottom but goes to center of diameter not side and when I have it as entered it touchs on diameter side but it is 3mm above the hit in Z.

    Any help is greatly appreciated.

    Gary Fitzgerald > Big Red
    sigpicThanks a Millionth

  • #2
    I am generally against cylinder probes because they must be absolutely perpendicular to the feature or they give bad data. I have never heard of a flat bottom cylinder probe before and I would not trust it. If you must use a cylinder and take hits with the bottom why wouldn't you want a radius? Seems you are just inviting Mr. Murphy to have a big party on your CMM table. Most probes are spheres because that ensures a single point of contact and helps to isolate the vector of the hit. With a flat bottom tip you could easily be taking a hit with one edge of that bottom diameter but the software/CMM would be recording it as if it were a hit at the center of the diameter. I do not even want to think about what it could do to your vectors. I do hope this helps.
    sigpic"Hated by Many, Loved by Few" _ A.B. - Stone brewery

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    • #3
      You can do this, and if you CAN do this will depend on WHAT you are doing. Basically, you can NOT use this for TIGHT tolerance, but this is what I do:

      1) Use just plain old extensions
      2) Use your mic's and get a good diameter reading, and check it a lot to see roundness
      3) Create the tip in the probe.dat file like you did
      4) DO NOT CALIBRATE THE TIP

      You will only be able to use it a 0-0, but your Z to Z values from touch-off to reading will be right and your XY to XY will also be right. There error creeps in for the probe comp in the XY directions since rarely will a probe actually calibrate at the size it mic's at, simply because of the ahrdware in the CMM. I have done this when I had to digitize flat blank, it is MUCH cheaper than a ceramic probe, will not shatter like one, and for my application (flat blanks) if I am within 0.010" it is good enough since the data then will need to be manipulated to make a smooth, easy to produce blank for a die.
      sigpic
      Originally posted by AndersI
      I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

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