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Subject:
From:
Pat McGuine <[log in to unmask]>
Date:
Wed, 11 Sep 1996 13:56:18 -0500
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Hello:

We have a new design that has 0805s on the bottom of a board that will be
wave soldered.  We have done 1206s for years but our dot for the 1206s is
too large for the 0805s.

We have a Camalot w/ a rotary displacement pump doing the dispensing.  It
has a mechanical z-axis compensator which allows me to set the height of the
needle above the board - but not on the fly (micrometer adjustment).  We
cure the adhesive in an IR oven.

I could use some advise.  I'm looking for answers to these questions:
Please don't feel like you have to answer all of them, respond to as many
(or as few) as you would like.

1) What adhesive have you been able to acheive good results with?  What is
it's rated viscosity if you happen to know it?
2) What needle diameter do you use?
3) Do you try to achieve a dot 2x the needle diameter?  If not, what size
dot do you strive for?
4) What is the height of the needle above the PCB?
5) What air pressure do you use (do you have a rotary displacement pump)?
6) Do you use a different size dot for 1206s on the same board.  If so, how
do you achieve the larger dot?

Thanks for any help.  I really appreciate it.

-Pat-

-------------
Patrick McGuine
Nicolet Instrument
[log in to unmask]
(608) 276-6334

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