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August 2000

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Subject:
From:
Jim Smith <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 8 Aug 2000 13:03:12 -0400
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Robert:

Interestingly, one place where hot bar soldering is used extensively is
a Lucent plant. Or perhaps I should say was because the machines were in
S&NP, which has been outsourced in the last year. You should contact Jim
Mosher, the S&NP manager at Columbus, to see if they shipped out the
machines along with the product. Perhaps you can pick up one of their
units. Jim's phone number is 614-860-7510.

The hot bars were used for soldering edge connectors and produced
numerous bridges. I was involved as a consultant and worked out the
proper process to ensure defect-free output. (Actually, I just took an
interest in the operation one afternoon and spent a short time sorting
it out. It wasn't very challenging.) The machines were very old (made by
Hughes, I believe, some 30 years ago). I don't know who sells equivalent
equipment today.

The number of leads and the relatively wide spacing would make hot bar
soldering ideal for your problem.

Jim Smith
Managing Director
Cambridge Management Sciences, Inc.
4285 45th St. S.
St. Petersburg, FL 33711-4431
Tel: (727)866-6502 ext. 21
Fax: (727)867-7890
eMail: [log in to unmask]

"Furrow, Robert Gordon (Bob)" wrote:
>
>         Hello TechNetters,
>
>         I am trying to improve and automate the soldering process for  a
> surface mount optical receiver. Presently it is being soldered by hand and
> although the results have recently improved, it would be desirable to
> automate to improve consistency. The major impediment to automation (and
> hand soldering) is the coplanarity of the leads. Over 60% of the parts have
> incoming coplanarity greater than 6 mils with a maximum over 10. Due to
> handling, by the time the part is placed onto the board and secured in
> place, nearly all the parts have greater than 6 mil coplanarity. Because of
> the extremely limited supply and uniqueness of these optical devices, the
> supplier(s) have not been as responsive to resolving incoming coplanarity
> issues as would normally be expected. I have tried a "point to point"
> automated solder system, but with the coplanarity issue, it does not
> presently appear a viable option. This seems to be an application where hot
> bar soldering might be a better solution. The parts have 6 leads at 50 mil
> pitch on both the "north" and "south" sides and 4 leads at 31 mil pitch on
> the "east" side of the component, all leads are solder dipped. I am not very
> familiar with hot bar soldering and would appreciate any input in regard to
> this application. Can all three sides be soldered at once? If hot bar
> appears viable, which vendors would you recommend? If other solutions spring
> to mind, please provide input. Obviously we will continue to work the
> coplanarity issue with the supplier(s) but I sure could use a solution now.
> Please respond to me directly or via the TechNet if you think it of value to
> the group. Any help is greatly appreciated.
>
> Thanks,
> Robert Furrow
> SMT Process Engineer
> Lucent Technologies
> 978-960-3224    [log in to unmask]
>
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