When calibrating a spindle probe, is it better to use a larger ring gauge?

FrodoLoggins · Oct 2, 2020

I have to recalibrate our spindle probe for our Haas mini mill. I think when we initially calibrated it we used someone elses ring gauge, but we have to recalibrate the probe and I'd like to buy our own so recalibration can be done quickly in the future.

If I were to use let's say a ~5" diameter ring gauge as opposed to a smaller ~3" diameter ring gauge, would that yield more accurate probing?

I'm assuming it technically will, but not really by much.

EDIT: Assuming the gauges are the same tolerance class.

kb0thn · Oct 2, 2020

You get to use 3"? The Renishaw on my Mazak uses a 1".

DouglasJRizzo · Oct 2, 2020

When I did that, I used a 3." ring gauge - it gives the machine a little room to work.

Mike1974 · Oct 2, 2020

I am not sure it would matter, as long as you are typing the diameter out to 4/5 decimals, then the machine does the rest. We use a .99996" and it works fine. Plus a smaller one will be cheaper, McMasster shows a 1" to be $155 and a 2" $278

DouglasJRizzo · Oct 2, 2020

Mike1974 said:
I am not sure it would matter, as long as you are typing the diameter out to 4/5 decimals, then the machine does the rest. We use a .99996" and it works fine. Plus a smaller one will be cheaper, McMasster shows a 1" to be $155 and a 2" $278

You may have a point. I used the one Renishaw supplied. It was a 3." gauge.

dian · Oct 2, 2020

what class are the gauges? the smaller one might have a tighter tolerance.

number 2 · Oct 2, 2020

I wouldn’t think size would matter, it can either position or it can’t in my opinion.

gregormarwick · Oct 2, 2020

It probably doesn't matter, but if anything larger would be worse, as any uncorrected pitch/geometry errors in the machine will affect the calibration, and increase as you increase the range used.

I use an 80mm ring gauge FWIW.

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When calibrating a spindle probe, is it better to use a larger ring gauge?

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