Disc styli BR (ball/roller), what does it mean

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  • Disc styli BR (ball/roller), what does it mean

    Hey all

    Ive a question about disc tips.
    At the plane side of the disc theres a sphere/roller that sticks out abit.
    I dont really know what this thing is for? I really cant find any information online about.

    Any idea what the thing is? can u measure with it? If so, how do i do that?

  • #2
    I think it's so you can stick the edge of the disc into a slot and measure the width. Of course, you need to figure out how to calibrate that ball...


    • #3
      It's like a triple rainbow!

      get out a micrometer. measure the distance between rollers (on opposing sides of the disc). write it down. this will be your 'constant' like you use during a thread wire measurement.
      measure Z location of part using top roller.
      measure Z location of part using bottom roller.
      subtract the two, than add your constant into the evaluation.
      that's about as accurate as you can get.

      If you are using a TP20, you need to be using a 6-way TP20 module, or your negative Z hit will be totally inaccurate.

      Don't expect the roller to be something that you can depend on. Orientation of the roller (Polar angle relative to probe CL) will be different each time you change any probing component.


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