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Getting a Star probe square to your machine

John Kingston
First, you need to have your star square to the machine.
What I do is place a 123 block on my plate.
I have a Rayco plate so it is easy to get that square.
When I put the star in I eyeball it square to the block.
Your dual calsphere needs to be pretty square to the machine also.
Next, I calibrate each tip individually, starting with #1.
It might take a few tries, but it'll work.
Here are a couple of pics of how I do it.


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  • Can't get any pics right now. CMM is set up for something else. Sorry, no flow chart. Sphere is at a 45 degree angle. I calibrate on the top sphere which points into Y-axis.

    1) Place 2 "1-2-3" blocks on the table. Get those square to the table. I use a Rayco fixture so this is pretty easy.

    2) Move head so that one tip of the star is between the "1-2-3" blocks. Make the gap in the 123 blocks as small as possible.

    3) Move head so that the 2tips perp to your first tip are parallel to the 123 block.

    4) Tighten star in that position.

    5) Calibrate the #1 tip. This is the tip pointing straight down.

    6) Calibrate all tips. You may have some come up "out-of-tolerance". Recalibrate only these. You may need to repeat that calibration a few times as the tips may be slightly out.

    7) once all the tips are in I run all tips again. It usually works after 2 runs.
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  • Can't get any pics right now. CMM is set up for something else. Sorry, no flow chart. Sphere is at a 45 degree angle. I calibrate on the top sphere which points into Y-axis.

    1) Place 2 "1-2-3" blocks on the table. Get those square to the table. I use a Rayco fixture so this is pretty easy.

    2) Move head so that one tip of the star is between the "1-2-3" blocks. Make the gap in the 123 blocks as small as possible.

    3) Move head so that the 2tips perp to your first tip are parallel to the 123 block.

    4) Tighten star in that position.

    5) Calibrate the #1 tip. This is the tip pointing straight down.

    6) Calibrate all tips. You may have some come up "out-of-tolerance". Recalibrate only these. You may need to repeat that calibration a few times as the tips may be slightly out.

    7) once all the tips are in I run all tips again. It usually works after 2 runs.
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