calibrate a disc styli

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myork1967
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calibrate a disc styli

Post by myork1967 » Sat Oct 12, 2019 8:38 am

as many years as I have been doing this I have only once calibrated a disc styli and that was about 1 year ago. (I was told we need a ring gage instead of a calibration sphere)

can anyone direct me to some info on this.

thanks in advance

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Re: calibrate a disc styli

Post by medupriest » Mon Oct 14, 2019 9:44 am

With DCC machines, a calibration sphere is suitable for the calibration. With Manual systems, you can set up a CAL-ring from the Probe ribbon tab.

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Re: calibrate a disc styli

Post by myork1967 » Thu Oct 17, 2019 9:49 am

ok thank you

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Re: calibrate a disc styli

Post by myork1967 » Thu Oct 17, 2019 10:26 am

what is the max form error acceptable on the calibration?

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Re: calibrate a disc styli

Post by medupriest » Tue Oct 22, 2019 10:12 am

That kind of depends on the machine and configuration.

What kind of form error are you getting and what do you get with a regular spherical stylus?

You can do some tests to see what the issue is.

If the stylus is tight and a length that is suitable for the strength of the module (if you are using TP20)(send a picture of the assembly if you are unsure) then you can try measuring 20-30 points on the ring gauge and then go to the feature database tab, right-click on the circle, and select "create form error graphical report".

If the high and low spikes are randomly displaced, the issue could me machine motion in general (error map/encoders/tuning reader heads).

If the high and low spikes follow a pattern (high and low every 60°, elongation along one axis or another), then you may be able to figure out what the issue might be from that pattern.

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