I.D. undersized/O.D. oversized??

[[Jo...]]

Good Morning all,

I returned from vacation this morning to CMM issues.

My main unit, Contura G2 is still broke down, currently waiting on technician to show back up today to try and get it fixed.

My second unit, Accura was getting funky results last week so everyone and their brother was working on it trying to resolve the problem. So the first thing I did was shut it down and repower everything. Did a full requalification on every stylus system in the rack. Was showing some pretty big variations afterwards so I thought cool that's the problem. Ran a test on a 1.000 set ring and first probe was checking it .0015 undersized. So I rechecked the same set ring with every down probe available and was within .0001 of all of them.

Then I ran an actual part that checks outside diameters vertically and all diameters were oversized. Seems that was what it was reading all last week as well. I.D.'s under and O.D.'s over.

Any ideas what it could be?

TIA

[[Am...]]

Couple things that come to mind, what is the evaluation method set to? and has anyone changed the reference sphere? Do you use temperature compensation?

[[Jo...]]

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Using Tensor mode, and no temp comp. I was thinking about the reference sphere actually. but it shouldn't be any different unless someone changed something. Maybe I can try our other sphere and see if there is any difference.

[[Am...]]

What I had happen once was someone copied the config file from one machine to the other. This changed the reference sphere that the machine thinks it has. If you look into your stylus system management you can see the serial number of the sphere assigned to it, then check what the number is on the physical sphere its located on the shaft.

[[Am...]]

Also what method are the ODs and IDs being calculated with.

[[Jo...]]

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I actually had the zeiss tech in here yesterday afternoon, and I had asked her this question, she mentioned that exact thing. So I pulled out the binder with reference sphere data and the radius was incorrect. After I corrected and requalified everything, its reading ID's and OD's great!

Never experienced that before. I still don't know if someone changed it or it did something on its own. Either way I know what to look for in this situation now.

Thanks for your help!

[[Am...]]

Awesome, glad that worked out. Calypso definitely has its fare share of bugs so its not out of the question, I've had several random issues crop up that Zeiss support couldn't fix without getting rid of the config file altogether. I keep some copies for each of the machines as using the one from another even of the same type can cause issues relating to the reference sphere.