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November 1999

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Subject:
From:
John Harris <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 30 Nov 1999 11:08:47 +1100
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Do you consider a very slow moving wave at the break point the key to
eliminating connector bridging? I'm fairly new to the game, and we run
Soltec's here which typically have turbulent waves. I am very interested in
any theories as to how the ideal wave should act to prevent this problem

Thanks

John Harris
Process Engineer
AEMS Pty Ltd

-----Original Message-----
From:   TechNet [mailto:[log in to unmask]] On Behalf Of Phil Bavaro
Sent:   Tuesday, 30 November 1999 6:19 AM
To:     [log in to unmask]
Subject:        [TN] Customized Electrovert Wavesolder Machine

Between the advent of BGAs and my refusal to subject them to wavesolder
stresses, and our sucessful producibility effort to design out thru hole
components, I have arrived at a bittersweet moment in my career as a
process engineer.

It is now time to get rid of my customized wavesolder machine which I
consider  to be as good as wavesolder gets (with a little bit of operator
finesse).

I have referred to my Electrovert Econopak II in many previous emails.
Now that it is time to say goodbye to this workhorse which is in perfect
working order, I find it difficult to just let the used equipment dealers
just take it for a song and a dance.  It really is my baby and I hate to
see it be sold as salvaged equipment.

Our management has made the decision to keep the two other Electrovert
wavesolder machines because they are newer, have more programmable
functions and require less maintenance wrt dross removal.  They are both
nitrogen (contour nozzles) inerted but their quality performance, however,
is no better than my customized Lambda machine.

I attribute this to my nozzle modification with which I am able to tune the
wave to the point that you could not see the solder moving except when the
surface tension dross lines appear.  This eliminated the connector bridging
defect which constantly plagues the normal Lambda and Contour nozzle
systems due to the microturbulence created by the Omega Wave paddle bar
openings.

This wavesolder machine was also retrofitted with an in-machine AT&T spray
fluxer and we added a custom stainless steel ventilation spray collection
system to eliminate any overspray on the topside of the boards.
Ironically, the exterior At&T spray fluxers sold by Electrovert in later
years almost matched our design except for one little item.  I added a
glass top to the collection cover so that when the equipment was started up
for the first time, the overspray was visible which removed one of the
guess in troubleshooting spray gun problems.

If anyone is in the market for a wavesolder machine in the near future,
please contact me before the end of the year as it is still being used
daily for production.  It always helps to see a used machine in action.

I'd much rather see it go to a good (Technet) home rather than be retired
into a dusty old warehouse and possibly never be used to solder high
reliability electronics again.


Enough said.......

                                   Phillip Bavaro
                               QUALCO/\/\/\/\ Incorporated
                                  CCA Technical Support
                              Staff, Manufacturing Engineer
                                (858) 658-2542 Voice-mail
                                (858) 658-1584 Fax
                                (858) 271-3640 Pager

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