L-shaped probe will not calibrate

[Big Red]

My new "L"-shaped probe will not pass calibration. I get an error stating, "exceeds STANDARD DEVIATION - excceds calibration limit".

I've played with the number of points, the hit speed and the number of levels but the error always returns.

I'd love to calibrate this new tool that I have created - CAN ANYONE HELP?

[ag1979]

Calibration Problems

I have that problem any time I try to overload (too much weight or length) on my probe. I also have the same problem when trying to use a probe setup on an extended force probe module with our PH9 head.

[JamesMannes]

As the VP sort of intimated, what is the setup you have? Software version?

[Big Red]

I have an Image with 3.7 MR2. The "L"-shaped probe is light (carbon fiber) and only 100mm long. I don't think that weight is an issuse as I have other, larger, heavier probes that calibrate just fine.
I'm thinking of increasing the allowable STANDARD DEVIATION to accomodate this tool.
Does anyone have a problem with that?

[MJBolster]

I'd suspect that something was loose, but I'm sure that you have the thing well torqued.

.02

MJB

[Wes Cisco]

I have an Image with 3.7 MR2. The "L"-shaped probe is light (carbon fiber) and only 100mm long. I don't think that weight is an issuse as I have other, larger, heavier probes that calibrate just fine.
I'm thinking of increasing the allowable STANDARD DEVIATION to accomodate this tool.
Does anyone have a problem with that?

What, you want me to knock the chip off of your shoulder? When I took the basic Pc-Dmis class the instructor told us up to .0004" was the limit. One thing I do when I am not sure is run the calibration again as a Qualification Check. Open the probe utilities and select "mark used" and "measure" then in the measure probe window choose the radio button "Qualification Check" instead of "Calibrate Tips". Now it will go run the routine, but not change the calibration, instead it will report what size it checked your artifact to be. If that number is good, your tip is probably ok to run. HTH

[dbusch]

All I can say is double-check your build-up - I've been absolutely certain before that I had a 1mm dia. stylus when I actually had a 1.5mm. I think that was the morning someone accidentally put decaf in the coffeemaker. Probe file or tool file corruption might be a candidate. What diameters/types of styli are they? A shank-out can happen if the tip diameter is close to that of the shank. In that case, you need an angle of attack that is not perp. to the shank.

[JamesMannes]

Reduce your touch speed force to .75% and measure it at 60% run speed.

[cmmguy]

100mm long?!?!? That is part of the problem right there.
But the kicker is that you are calibrating in both a push and pull motion on a touch probe and the force to pull is quite different than the force to push. You would also see this type of error on a single right angle stylus of a star probe.

You did not say which probe you are using, but the TP20 is the absolute worst at this error and even the 6 way sucks. I did a lot of testing on calibrating these types of probes and have just come to accept the higher form error as par for the course.