Joe

I have made similar measurements using spark plug gap gauge. I am not sure it will work in this case since I do not know haw accessible the board is at the time you want to make the measurement.

Best regards
Lee
J. L. Parker Ph. D.
JLP Consultants LLC
804 779 3389 
  ----- Original Message ----- 
  From: Joe Macko<mailto:[log in to unmask]> 
  To: [log in to unmask]<mailto:[log in to unmask]> 
  Sent: Tuesday, February 16, 2010 3:34 PM
  Subject: [TN] Best way to measure "actual" themal pad compression


  All,

   

  I am looking for some proven ways to measure the actual air gap (e.g., 5
  to 30 mils) between a component and its mating thermal pad pedestal
  located on a Chassis without cutting up the hardware so I can determine
  the actual thermal pad compression once a pad is installed.  Using a
  model, the theoretical gap can be calculated but I would like to
  empirically measure/verify what the gap is and the subsequent pad
  compression.  Visually, it is hard to tell and not all locations are
  visible and, I do not have access to any hardware to cut up, etc.. so I
  am looking for a tried and proven method. Some have suggested using a
  soft material like putty that will compress and could then be
  subsequently measured after disassembly. I have heard rumors of material
  designed for this purpose but are unable to find such material.  thx

   

  Best Regards,

  -Joe M.

   


  "This e-mail and any attachments are solely for the use of the addressee and may contain L-3 proprietary information that may also be defined as U.S. Government export controlled technical data. If you are an unintended recipient of this e-mail, use, disclosure or distribution of its content is prohibited. Please notify the sender by return e-mail and immediately delete this message."
   

  ______________________________________________________________________
  This email has been scanned by the MessageLabs Email Security System.
  For more information please contact helpdesk at x2960 or [log in to unmask]<mailto:[log in to unmask]> 
  ______________________________________________________________________

  ---------------------------------------------------
  Technet Mail List provided as a service by IPC using LISTSERV 15.0
  To unsubscribe, send a message to [log in to unmask]<mailto:[log in to unmask]> with following text in
  the BODY (NOT the subject field): SIGNOFF Technet
  To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]<mailto:[log in to unmask]>: SET Technet NOMAIL or (MAIL)
  To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]<mailto:[log in to unmask]>: SET Technet Digest
  Search the archives of previous posts at: http://listserv.ipc.org/archives<http://listserv.ipc.org/archives>
  Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16<http://www.ipc.org/contentpage.asp?Pageid=4.3.16> for additional information, or contact Keach Sasamori at [log in to unmask]<mailto:[log in to unmask]> or 847-615-7100 ext.2815
  -----------------------------------------------------

______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------