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June 2001

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Subject:
From:
"Kasprzak, Bill (sys) USX" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 12 Jun 2001 07:36:21 -0400
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Hello all,

I've been watching this thread for a few days now hearing about how solder
paste can be dispensed from an automated system.

My experience has not turned out very well with only very limited success.
We have a Camalot 1414, even bought the special displacement pump designed
for this application and attempted to dispense solder paste. I just could
not get the system to be repeatable. Once I had a set up, repeating the next
day or even the next hour was impossible. I tried different pastes,
different particle sizes, needle sizes, etc. etc. One of the biggest
problems that I had was coining. This is where the particles compressed to
form a solid plug where the paste entered the dispensing needle.

I gave up on this method, settling instead on using microstencils to apply
paste.

I would like to know of anyone who has had success with dispensing solder
paste. I would like to know some particulars about the process. (paste,
needle size, pump pressures, etc) I would not mind trying this again if I
could just get some help with this.

However, if you've never done this and you're thinking that this is a viable
process, I am advising to be very careful about sales pitches that claim
that solder paste dispensing can be done. I don't think that it is a
repeatable process.

Bill Kasprzak
Moog Inc., Electronic Assembly Engineering

> -----Original Message-----
> From: Mike Fenner [SMTP:[log in to unmask]]
> Sent: Tuesday, June 12, 2001 3:47 AM
> To:   [log in to unmask]
> Subject:      Re: [TN] Looking for a "special" solder paste dispenser
>
> Solder paste can be dispensed quite well from these systems provided that
> proper attention is paid to correctly specifying the material. Solder
> pastes
> are inherently more difficult to dispense than adhesives but if particle
> size range [and distribution in the specified range] is correctly done
> with
> the right vehicle rheology, consistent dispense at quite high rates is
> achievable.
>
> Mike Fenner
> Indium Corporation of Europe
>
> Hi, Craig,
>
> You could try Asymtek, part of the Nordsen group, which specialises in
> fluid dispensing technology. They seem to be the market leaders. They do
> underfill, adhesive and flux dispensers, and though I haven't seen a
> solder
> paste dispenser in their list, they may do one. Or try  EFD - they do have
> a paste dispenser, but you'll need to decide its accuracy for yourself.
>
> Pete Duncan
> Hello Technetters,
>
> For research and development purposes, I am looking for a machine that
> dispenses solder
> onto a board WITHOUT the use of a solder stencil. The speed is not as
> important as accuracy and
> quality of work.
>
> Do you know of a machine like this? If so, how can I find one?
>
> Thanks for your help,
> Craig
>

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