Technet,
     You might consider the use of wave solder pallets with appendages that 
     are spring loaded or sponged that hold down critical components during 
     wave.  This will make it easier to maintain a consistant profile for 
     your assembly and allow the pcb and flux to be preheated to achieve 
     maximum soldering results.
     BW 


______________________________ Reply Separator _________________________________
Subject: Re: WAVE SOLDER SANDBAGS
Author:  [log in to unmask] at uucpmail
Date:    5/19/97 4:48 AM


In message <[log in to unmask]> Daryl Muma writes:
> I'm looking for info on "sandbags", or similar techniques, used to
> prevent the unseating of larger thru-hole components from PCB's through 
> the wave solder process. Any vendors, contacts or experience is
> appreciated.
     
Daryl,
     
I've not seen these offered commercially before. However, you might consider 
making up some yourself. You can buy high temperature 'beans' or 'peas' (not 
sure what they _actually_ are) from a cooking shop. They are used to keep an 
otherwise empty pie crust flat when baking - you fill the pie with these 
things, bake, then remove and fill the pie with some yummy stuff at a later 
date.
     
They should withstand topside wave solder temperature OK. Just sew them into 
some sort of bag... hmm, perhaps made from a non-flammable fabric. 
     
The idea works OK for the right problem. Pretty cheap too. They might get a bit 
flux-fumey after a while, so perhaps best thought of as a consummable.
     
If you try it, please let us know how they work.
     
Peter
     
P.S. 'Baking' AND 'Sewing' on TechNet - what next? 
-- 
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Peter Swanson                                              Oxfordshire, England 
INTERTRONICS
[log in to unmask]                      http://www.cygnetuk.demon.co.uk
     
Suppliers of materials and consumables to the electronics & related industries 
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