RHELLER (asker) Aug 16, 2006:

:-) Neither had I! For the record, it is "grenaillage" en français. Never bored in this profession.

Bourth (X) Aug 16, 2006:

I'm glad I came! Had never encountered US shot peening.

Terry Richards Aug 16, 2006:

Bourth was on the right track - it's 1/10 millimeters. If there's multiple ultrasonic transducers they need to be accurately positioned or they will be out of phase with each other and the shot won't shoot :) BTW 5/10 = 20 thou.

RHELLER (asker) Aug 16, 2006:

Yes, Terry, it is ultrasonic. Thanks.
I decided to use Yakov's idea but I appreciate everyone's help.

Terry Richards Aug 16, 2006:

Is this an ultrasonic shot peening machine? I suspect it is...

Bourth (X) Aug 16, 2006:

I WAS going to say that in my experience, in my fields, "10èmes" usually refers to 10ths of a millimetre ... But I still don't see the connection between "positionnement", "acoustique", and your machine ...

RHELLER (asker) Aug 16, 2006:

Hi Bourth and Yakov, some measurements (i.e. tolerance) are given in mm, but not close by to this paragraph. Thanks for your help.

Bourth (X) Aug 16, 2006:

Do they not specify units somewhere close nearby. Like decibels, maybe? (though I can't see the connection with a shot peening machine).