Tip Calibration Process

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.

acgarcia over 1 year ago

You always want to use a master probe for locating the sphere on the table regardless if the sphere moves or not. Always answer Yes man or Yes dcc. All other probes and tip need to be answered with No. Master probes are usually short with a large ball like a 5x10 or 4x10.
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acgarcia over 1 year ago

The master probe shouldn't be used for measurement but you have to do what you have to do sometimes. If you have more angles on your master probe, you need to select all of you tip angles including A0B0 and answer yes the sphere is moved. It will only us A0B0 to locate the sphere and then calibrate the other angles accordingly. No need to do it again answering No.

https://www.pcdmisforum.com/forum/pc...ules-selection

post # 6
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Smasherofprobes over 1 year ago

acgarcia Thank you I read it over and have a bit more understanding now. Ive only ever used 1 Setup for my probe assembly (TP20+100+20+20x2) and rotated between 2mm and 3mm. From my understanding now this might be too many extensions to consider using as a master probe. I will make a separate file and just calibrate A0B0 on it (Yes man or dcc), then calibrate my tip sets (50 total) ( saying no )
Also when i calibrate the master should i be checking off the box that says "Reset tips to theo at start of calibration" ?
I really appreciate the help I was having a terrible day today trying to figure out why I was having issues.
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Peter Fuller over 1 year ago

The answer is that it doesn't matter unless the sphere has actually moved. But I find that I get the best results by not remeasuring the master probe. So my order of operations is to measure the the master tip and answer yes to has it moved, then I measure all other tips.
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Smasherofprobes over 1 year ago in reply to Peter Fuller

So you have "Master Probe" with just A0B0? then you go into your tip set and measure all saying (No not moved) right ? And you include A0B0 in your tip set calibration? ( I think you have to ) Thanks for your response Peter.
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NinjaBadger over 1 year ago

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.
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Smasherofprobes over 1 year ago in reply to NinjaBadger

Thanks Badger
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R2ah1ze1l over 1 year ago

After saying YES with the A0B0, I don't think you want to calibrate the A0B0 in your remainder of probes with the 'NO'.
If you ever feel you need to recalibrate the A0B0 because there is some strange issue, I think it would be an isolated calibration for that tip then 'NO' on any following tips to ensure correct mapping.
And when referring to A0B0, it should be A0B0 of the same probefile every time. Not just any A0B0 from any probe build you have.
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Smasherofprobes over 1 year ago in reply to R2ah1ze1l

Im good at making simple things difficult Thanks for your help
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Smasherofprobes over 1 year ago

Here are the results from my A0B0 Calibration, do you see anything funky ?

Attached Files
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