Angela:
        Let me add my 2 cents.  In order to melt the doughnuts, the boards
need to be baked for about an hour at around 190 F with the doughnuts
already loaded.  Take them out of the oven one at a time and melt the
doughnuts with a heat gun making sure that the heat is not directed at one
spot only. The heat gun must be in motion, either circular or linear motion
to avoid heating one area only, this is to avoid delamination.
        Regards,
        Ramon

> -----Original Message-----
> From: Laroe, Mike [SMTP:[log in to unmask]]
> Sent: Thursday, April 17, 2003 2:06 PM
> To:   [log in to unmask]
> Subject:      Re: [TN] Controlled Solder
>
> Hello and welcome,
> To answer your question about the availability of solder doughnuts; Yes,
> they do exist but are designed to meet your specific criteria.  Here's the
> technical link to Kester Solders whom I've used in the past for the same
> purpose.  Most likely you'll just need to supply them with a drawing and
> rough quantity..
> http://www.kester.com/technical_service.html
>
> Good Luck,
> Michael Laroe
> MSL-Lowell
> (978)677-2977
>
> -----Original Message-----
> From: Angela Gregor [mailto:[log in to unmask]]
> Sent: Thursday, April 17, 2003 1:44 PM
> To: [log in to unmask]
> Subject: [TN] Controlled Solder
>
>
> Hello everyone! As a new member I am going to put this new tool to the
> test
> immediately. I work for a small company in Florida, and we build mainly
> defense product for the government. We have a big problem hopefully
> someone
> can help with. We are currently building a product that has through hole
> cylindrical type hollow pins inserted into a printed circuit board then
> soldered into place. (solder is not allowed to make contact with the
> inside
> wall of the hollow pins). We are allowed only minimal amount of solder. It
> is extremely difficult to achieve this while maintaining 75% fill of
> solder
> in the board. I have heard of something called solder doughnuts that will
> allow us to flow the same amount of solder each time but have been
> unsuccessful in locating them. Any advise would be helpful. Thanks!
> Angela
>
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