http://216.203.210.37/GregM/S02_Shea.doc

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Monday, May 12, 2003 3:40 PM
To: [log in to unmask]
Subject: [TN] Stencil printing SMT Adhesives...


Hi All!

I've stencil printing adhesives for a while now, but I've run into a
problem with this one assembly. The problem is that on the backside of
this board there are about 30 or so MELF diodes with square endcaps (A
JANTX part), and these parts stand-off the board enough so that the part
doesn't contact to epoxy.

Cookson used to have a good article about stencil design when stencil
printing adhesives, if I remember the article correctly, it stated that
with proper design, you could get the adhesive height taller than the
stencil thickness...I think they took it off their web page because the
article was saying you could get variable dot heights by stenciling the
epoxy, and thus you don't need a Camelot dispenser B^D

I can't increase the stencil thickness, because I'm stenciling epoxy for
0805's, and I'm afraid if I go thicker on my stencil, the epoxy won't
release with the small openings. Does anybody still have that *.PDF? Or
possibly give me some insight to increase the dot height?

I sure would be appreciative...

-Steve Gregory- ---------------------------------------------------
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information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
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