A0 B0 tip calibrates out.

[ginnbob]

how do I get my tip qual to come out good on my A0 B0?

[Darrollh]

Make sure the build is correct, make sure cal ball/tip is clean. That’s just a couple of things I would start with.

[pcdmisstudent]

Hi bobby =)
Please give more info on your problem, whats "good" ? Do you mean you get bad STD value, or incorrect XYZ values?
Is it only ur master tip that calibrates "badly" (whatever that means) or is it all ur stylis and angles?
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Cleanliness is very very important.
But the impact of the calibration parameters makes a difference.

Do you use standard parameters?

my opinion: Depending on ball size, measure more than 90 degrees of the sphere (like -10 to 90). (And less degrees for smaller tips <1mm)
Prime numbers for number of points, 5, 7, 13 etc..
And always check the "reset this tip to nominal values before calibration" on master tip (a0b0).

[ginnbob]

Everything was cleaned. I am getting a STD value of .005.

[Douglas]

you must mean .005" since .005mm is pretty good... what is your probing system? for an error that large I'd suspect something is moving around... the one thing that can be hard to find is sometimes the ruby will be loose on the shank and move around,

[Douglas]

gibsonridge I think something must have changed thru newer versions, when I calibrate using an inch program it gives me this

Probe file=MASTER Date=6/29/2020 Time=1:02:02 PM

Qual Sphere CENT X 9.386018 Y14.072106 Z-19.292166 D0.749960
T1A0B0 THEO X 0.00000 Y 0.47244 Z 7.24902 D0.15748
T1A0B0 MEAS X 0.00000 Y 0.47244 Z 7.24902 D0.15740 StdDev0.00002

same probe calibration in a mm units program sends this to the results file

Probe file=MASTER Date=6/29/2020 Time=1:07:58 PM

Qual Sphere CENT X238.40519 Y357.43118 Z-490.02105 D19.04898
T1A0B0 THEO X 0.00000 Y 12.00000 Z184.12500 D4.00000
T1A0B0 MEAS X 0.00000 Y 12.00000 Z184.12500 D3.99796 StdDev0.00050

[gibsonridge]

WOW, at least i know i am not completely crazy ...yet thanks

[Douglas]

not just you it had me wondering if I had ever mistaken mm for inch in std dev, but somehow doubted I could have seen .00003 mm on 22 hits at 4 levels

[Douglas]

this happened to me not long ago, that glue joint had a bit of wiggle in it and had me chasing my tail until I found it. it ran a little high, .0005 - .0008 for a while then all at once it wouldn't do any better than about .005" and that is when I started wiggling stuff to find what was moving because that much error is hardware not software,

on a side note I glued it back together using gorilla gel glue... so far it has held up and kept std dev as low as .00005 with a standard force module and short tip, but it has not been given the test of time it still is out of service

https://www.pcdmisforum.com/forum/pc...-qualification

[ogcharliebrown]

I had a BB ( not the carbide but the stainless one) come out of a stylus clamping and used that gorilla gel glue and so far so good. I couldn't see tossing a $542.00 part in the trash!

[LaserJay]

ogcharliebrown I had the same thing happen to one of my stylus plates and I glued mine back on as well. I talked to the gentleman from hexagon then next time we had our machine calibrated and he suggested if that happens again and I lose the metal ball that I could go buy a 2mm ball bearing from the hardware store for $0.50 and it would work just the same lol

[ogcharliebrown]

LaserJay That's good to know. I had to look in every hole on my RAYCO plate to find it. thanks