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Tip Calibration Process

Smasherofprobes
Hello all, could you please verify that I am calibrating my tips properly! I recently calibrated my machine and my results seem offset in one axis. (Calibration sphere comes off the table after every calibration)

I start by selecting A0B0 only ( Say Yes, Sphere has moved) Calibrate it by itself

Then I Select all tips (Including A0B0) and say No, Sphere has not moved)

The second time I calibrate my tip set should I be including A0B0? Also, Do you guys have a separate probe file called something like "Master probe" with just A0B0? or do you calibrate it within the tip set.

I haven't been on a machine in many years and I'm trying to remember the correct way to do this.

Thanks and my apologies if this is a re-post.
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  • If you recalibrate A0B0 on the master probe saying no (after first calibrating it saying yes), you are then introducing deviations into its offsets which isn't desirable, Although typically these will only be a micron or two.

    Also your probe build of 140mm with a tp20 is way too long (max stylus length for a tp20 is meant to be 50 or 60mm depending on the module force), although you could realistically have maybe 80mm and not lose to much accuracy.

    As Garcia said, if you select all tips and say yes it's moved, it will use A0B0 to define the sphere location, then all the other tips will be calibrated relative to it.
  • in reply to NinjaBadger
    Technically, with a TP20 you can absolutely "have" longer probes that work fine, but you need to understand & acknowledge what kind of repeatability you will end up with, when you go over the length. It's silly to expect +/- 0.0001" accuracy out of it.

    --As an example, say you build a 140mm probe to check the diameter of a bore with a +/- 0.050" tolerance. You use a carbon fiber or ceramic extension with some tiny TC-shanked tip... As long as you aren't detecting false hits while probing and you can confirm you're still within +/- 0.005" of variation (10% tolerance), your method of measure is still statistically sound enough to determine pass or fail.
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  • in reply to NinjaBadger
    Technically, with a TP20 you can absolutely "have" longer probes that work fine, but you need to understand & acknowledge what kind of repeatability you will end up with, when you go over the length. It's silly to expect +/- 0.0001" accuracy out of it.

    --As an example, say you build a 140mm probe to check the diameter of a bore with a +/- 0.050" tolerance. You use a carbon fiber or ceramic extension with some tiny TC-shanked tip... As long as you aren't detecting false hits while probing and you can confirm you're still within +/- 0.005" of variation (10% tolerance), your method of measure is still statistically sound enough to determine pass or fail.
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