Jan,

     Try Bullen Ultrasonics, Inc. in Eaton, Ohio, USA.  They have done
     ultrasonic drilling for us in both silicon and glass.  Their number is
     513-456-7525.  Best of luck.

     Brent E. Burns
     Integrated Micro Sensors Group
     Northrop Grumman ESID
     Hawthorne, CA
     Brent_Burns@ccmail.northgrum.com


______________________________ Reply Separator _________________________________
Subject: Ultrasonic drilling
Author:  Jan Kowal  at INTERNET
Date:    2/6/97 4:26 PM


Does anyone know where I can get ultrasonic machining of glass and
silicon done?  Typically, I need large numbers of holes in the
sub-millimetre range drilled into 3" and 4" substrates, up to 1mm
thick.

--
Jan Kowal
Applied Microengineering Ltd
68 Milton Park
Abingdon, Oxfordshire, UK
Tel: +44 (0)1235 833934
Fax:             833935
e-mail: kowal@aml2.win-uk.net