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Calibration of small star probes

I'm trying to calibrate a 1mm (ball dia) x 3mm (length) star probe on a 25mm sphere. The probes want to rotate around that sphere at the equator, but it's too small to get good hits. What are the settings that I can input to move where the probes take their hits?
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  • That is interesting. I have never thought of using a stylus as a cal sphere. We calibrate our cal sphere so idk if I would take that route unless I had a supermic to get the exact diameter. I like that idea though.

    I would start by changing your start and end angles. Unless you get a smaller cal sphere unfortunately that is probably your only option.


    I used to work a lot with a Renishaw Equator. That machine used an M5 Star Stylus as it's qualification sphere. It was weird to calibrate a 30mm disc probe on 5mm Sphere.

    One of the guys here used to work at Renishaw and he says that the roundness precision of their standard styli tips is practically the same as their qualification spheres. I don't know about the diameter tolerance though. I agree, I would want a super accurate measurement on that if I were to use it as a reference.
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  • That is interesting. I have never thought of using a stylus as a cal sphere. We calibrate our cal sphere so idk if I would take that route unless I had a supermic to get the exact diameter. I like that idea though.

    I would start by changing your start and end angles. Unless you get a smaller cal sphere unfortunately that is probably your only option.


    I used to work a lot with a Renishaw Equator. That machine used an M5 Star Stylus as it's qualification sphere. It was weird to calibrate a 30mm disc probe on 5mm Sphere.

    One of the guys here used to work at Renishaw and he says that the roundness precision of their standard styli tips is practically the same as their qualification spheres. I don't know about the diameter tolerance though. I agree, I would want a super accurate measurement on that if I were to use it as a reference.
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