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December 2010

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From:
Bob Landman <[log in to unmask]>
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Date:
Wed, 22 Dec 2010 14:47:40 -0500
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You can also talk to Volkhard Quant at Crest if you can't get ahold of Sami.  We used to be next door to Crest (Uthe) when our two companies were in Burlingame CA.  Bright fellows all. Sadly Mike Uthe (founder, genius and one heck of an inventor) passed away years ago.  

Bob Landman
H&L Instruments, LLC
  _____  

From: Stadem, Richard D. [mailto:[log in to unmask]]
To: [log in to unmask]
Sent: Wed, 22 Dec 2010 13:00:10 -0500
Subject: Re: [TN] AW: [TN] Needed reference

I suspect that Torsten may be looking for information on being able to perform the ultrasonic welding on the plastic case without damaging the gyro and accelerometer ICs soldered to the CCAs inside, which are typically MEMS and are thus very sensitive to ultrasonic energy and could possibly be damaged. Torsten, if that is your concern, then I would encourage you to talk to Dr. Sami Awad at Crest Ultrasonics, who is an expert on the subject. You can reach him at:
  http://www.crest-ultrasonics.com/downloads.html (609) 883-4000.
  I encourage you to also talk to Hermann Ultrasonics, http://www.herrmannultrasonics.com as they are very knowledgeable regarding plastic welding of electronics encasements.
  
  Having direct experience with soldering of ceramic wedge-mounted MEMS gyros and accelerometers, I would encourage you to find a way to heat-seal or epoxy bond the case without the ultrasonic welding. 
  
  -----Original Message-----
  From: TechNet [mailto:[log in to unmask]] On Behalf Of John Goulet
  Sent: Wednesday, December 22, 2010 10:52 AM
  To: [log in to unmask]
  Subject: Re: [TN] AW: [TN] Needed reference
  
  I've used the Branson Ultrasonic welder for several projects. You cold check their website for types of applications and possibly other models. I know where there is one in surplus. 
  
  The contract assembler was holding onto it just in case another job came up. 
  
  After so many years they may be willing to sell it. 
  
  Sincerely 
  
  John Goulet 
  
  MFG/Process Engineer 
  ----- Original Message ----- 
  From: "Torsten Hagge" <[log in to unmask]> 
  To: [log in to unmask] 
  Sent: Wednesday, December 22, 2010 4:15:43 AM 
  Subject: [TN] AW: [TN] Needed reference 
  
  Hi, 
  
  has anybody info about ultrasonic welding of plastic housing with electronic PCBs inside? We have done such process with simple mobile phone boards several years ago, but at the current project a gyro and an accelerometer IC are on the PCB, together with a lithium battery... 
  
  Alternative is laser welding, but that process is much more expensive... 
  
  Best Regards,   
  
  i.A. Dipl.Ing.(FH)Torsten Hagge 
  tech. projectmanager 
  Kristronics GmbH 
  Gewerbegrund 5 - 9 
  24955 Harrislee 
    
  Tel.:    +49 461 7741 624 
  Fax:     +49 461 7741 642 
  [log in to unmask] 
  www.kristronics.de 
    
  Gerichtsstand Flensburg, Handelsregister: HRB 1433 FL 
  Geschäftsführer Dipl.-Ing. oec. Thormod Ohm 
  Ust-Id-Nr. DE 811182059 
  Bankverbindung: Deutsche Bank AG Flensburg, Konto-Nr. 4216610, BLZ 21570011 
  IBAN: DE32 2157 0011 0421 6610 00, BIC: DEUT DE HH 215 
  
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