One suggestion, instead of trying to keep the parts from floating up 
     through the wave, lower the wave until it just touches the bottom of 
     the board.  This lowers the positive pressure and leaves the flow 
     through to the wicking forces.  I have tried this with normal 
     thickness boards (0.062-0.90).
     
     Shaun
     
     [log in to unmask]


______________________________ Reply Separator _________________________________
Subject: Assy:StraightThruPartRetention
Author:  [log in to unmask] (John McGee) at 
Internet_SA
Date:    9/12/96 10:47 AM


     
     
Good morning-
     
Does anyone have info regarding successful techniques for retaining 
unclinched parts in an assembly through the wave solder process?
We'd like to continue with our  parts "prepped" to the correct lead length, 
but we're open to suggestion.
     
On Monday, I solicited info on the use of Blister Pack machines for that 
purpose.  I cited IPC-CM-770, Figures 21-2 and 21-4 as triggering my 
interest
in this approach, which we had not yet tried.
     
As I received no response, I'd like to try again, in more general terms:
     
* If you've tried blister pack in this application, has it proven 
successful?
   (If you haven't tried it, do you know anyone who has who might be 
   willing to share their experience?)
     
* Is it a reasonably straightforward process or are there a lot of side 
issues
  to consider (i.e. environmental, material availability, process 
instability, etc.)?
     
* Does any blister packing machine work or are there those specifically
  appropriate to electronic assembly?  Who to contact?
     
Any input is appreciated.  Seriously!  Thanks!
     
     
     
     
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