Horizontal CMM Experience? Looking for info...

Two questions:
Did you verify that your CMM program was outputting good numbers by checking some dimensions through other inspection means?
Are all three of you using the exact same program?

If yes and yes...and if 2 out of 3 are saying its good, and the 1 saying they are having issues hasn't been calibrated in 5 years...... then I think we have found our issue.

To Milicron Mike 's point....I hate horizontal CMMs due to the exact issues he has laid out. There is a fine science that must be learned & applied in order to measure properly and accurately.

It is ABSOLUTELY INCOMPREHENSIBLE to reject someones work with an un-calibrated instrument. Especially a CMM. ESPECIALLY a horizontal CMM. There is so much wrong with their line of thinking its not even funny.
Sounds like your on the right track. I'd still perform a CPK on your ball bar internally, then send it out for measurement like you said to the outside sounce. Your CPK study, along with their acceptance of your ball bar, along with your cert SHOULD be enough. All you can do is plead your case with what you've got.

If they still refuse to accept your data, then I'd broach the topic of having the fixture returned & doing a CPK on that as I have said previously.

Somethings got to give...and if you can prove from 8 different angles that you're right and all they've got is an uncalibrated machine that has known hardware faults and a "guy that they trust"....then not only will you gain some respect at your company but they won't challenge you again either.

I deal with this a lot. ESPECIALLY with aerospace and medical OEMs who couldn't program/design/manufacture their way out of a paperbag

It is ABSOLUTELY INCOMPREHENSIBLE to reject someones work with an un-calibrated instrument. Especially a CMM. ESPECIALLY a horizontal CMM. There is so much wrong with their line of thinking its not even funny.
Sounds like your on the right track. I'd still perform a CPK on your ball bar internally, then send it out for measurement like you said to the outside sounce. Your CPK study, along with their acceptance of your ball bar, along with your cert SHOULD be enough. All you can do is plead your case with what you've got.

If they still refuse to accept your data, then I'd broach the topic of having the fixture returned & doing a CPK on that as I have said previously.

Somethings got to give...and if you can prove from 8 different angles that you're right and all they've got is an uncalibrated machine that has known hardware faults and a "guy that they trust"....then not only will you gain some respect at your company but they won't challenge you again either.

I deal with this a lot. ESPECIALLY with aerospace and medical OEMs who couldn't program/design/manufacture their way out of a paperbag