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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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