0.5mm X 50mm Calibration issue?

[[AG...]]

 

My Question is i know i am missing something small and i cant put my finger on it? It wont calibrate the probe, but the RC-CAA is good? The end of run says it doesnt qualify? I am wondering is this something small i am missing? It is set on Sensitive and 30% pressure. Thank you for any feedback.

[[DW...]]

Even with coverage set at 120°, you most like likely are still shanking out a 0.5mm probe on a 30mm sphere. You need to be using the 8mm sphere. This allows you to get 180° of coverage and not shank out.  Your sigma value is 0.0007 inches, which is insane. This means you have no repeatability. I think the default sigma max before it won't qualify is 0.0004 inches, which is still really high. I would say absolute max I would want to see is 0.0001 inches for the sigma value. High sigma means you are shanking out, or your probe tip is damaged or loose.  Also, switch to metric units when you qualify a stylus, or change decimal places to '5' for inch so you can really get down in the weeds.

 

[[Je...]]

I agree with DWC.  You need to use a smaller reference sphere such as 8mm.

[[AG...]]

Please sign in to view this quote.

 

Please sign in to view this quote.

Yes i agree 0.0007 is insane for sure. I dont have an 8mm sphere to use, only what i have and the crazy thing is the gentleman before me was calibrating it good? I am not understanding how he got it to calibrate? I looked over the probe tip and it is good. I checked to see if it was loose and that was tight. I must be shanking out at the 120 coverage then is my guess. If i lower the Sphere coverage will this qualify and will it affect my programs? 

[[AG...]]

Yes i agree 0.0007 is insane for sure. I dont have an 8mm sphere to use, only what i have and the crazy thing is the gentleman before me was calibrating it good? I am not understanding how he got it to calibrate? I looked over the probe tip and it is good. I checked to see if it was loose and that was tight. I must be shanking out at the 120 coverage then is my guess. If i lower the Sphere coverage will this qualify and will it affect my programs? 

[[DW...]]

Go into the Stylus System Management, find that probe, click to open up the Geometry, Quality, and Settings. Click on Quality. Screenshot that for us.

[[AG...]]

Here is what you are requesting to see and i took a screen shot of the recent numbers from Qual 

 

[[Ja...]]

I have had similar issues on a 0.5mm probe after some curious measurement results and like the others suggested it is maybe worth investing in an 8mm reference sphere or more investigation from that end- but after a day of investigating the program and slowly being led back to recalibration I ended up just replacing the probe for my own sanity and I had no issues. It also *appeared* perfectly fine/undamaged under a toolscope..

[[DW...]]

Please sign in to view this quote.

This is concerning. On November 27 of this year, someone tried to qualify this stylus and it failed (noted by the red color, and no values in sigma, dynamic sigma, and rigidity). If they said they got it to qualify, they are not telling the truth and that is the proof. Which is even more concerning, because I believe if you attempt to use a stylus that is not qualified, Calypso yells at you that you are using an unqualified stylus and they probably went ahead with it anyway.

 

Reducing coverage to less than 120°, down from 180°, is not a good idea because then only a small portion of your stylus will be qualified and any measurements using an unqualified portion of the stylus are not valid. You need to get an 8mm stylus from Zeiss or stop using stylus systems with probes less than a 1.5mm radius until you do. 

[[AG...]]

Please sign in to view this quote.

Totally understand, yes i started just after this date. So i see what your getting at. I will look into the 8mm sphere.

[[Da...]]

FWIW, 0.5mm tips break VERY easily and need to be inspected with a loupe. Every time I calibrate my 0.5, I do that first.

[[AG...]]

Oh yes they do break easy for sure! I have inspected it with a loop and microscope. I was able to calibrate this 0.5 the shaft diameter was shanking out on the sphere. I happened to have a smaller shaft that stepped down and didn't shank out and calibrated without alot of clearance. This was after breaking the previous tip. So i have 3 more on order for the future. 

[[Ri...]]

Please sign in to view this quote.

I always used stepped shafts for 0.5mm probes on a 30mm reference sphere, no issues at 180° coverage.

[[AG...]]

Yes, the current probe that i am using is a Zeiss probe. The one that was being used was a TPI. I have not seen this style it had a larger shaft and when it was trying to calibrate it was shanking.