Hi Steve,
Thanks for the info (and sympathy).
I didn't go into very deep detail on my original TechNet inquiry. Possibly
being brief wasn't the best way to express the reason for my need.
I'm an engineer responsible for 8 Electrovert solder machines. Some are
relatively new and some are not so new. Most of them are equipped with
Lambda wave with Omega wave option plus a standard chip wave or a rotary
chip wave. Every so often the chip wave will suffer an electronic speed
sensor malfunction and the logic will think the motor is slowing down. The
control board sends a signal to the chip wave motor to speed up and within a
couple of minutes the chip wave can pump 25 to 50 lbs. of molten solder over
the pot wall and down into the bowels of the machine.
We do not have an operator standing at the machine. Onload is via automated
conveyors and the offload end feeds onto a conveyor where the wave solder
operator serves as a process control/touch-up/whatever is necessary
operator. Once the solder begins to overflow, the operator may not see/hear
anything for minutes. The result is a mess to clean up. Thank heavens that
it doesn't happen very often.
We have recalibrated the speed control cards, verified the distance from the
shaft to the pulse counting sensor, performed self diagnostics and learn
functions. I thought if I could detect the first splash and shut down the
applicable pump(s), we could save a bit of maintenance overtime.
Pete
> Honeywell
Peter A. Phillips, Sustaining Engineer
Manufacturing Engineering
Home and Building Controls
8500 Bluewater Road N.W.
Albuquerque, NM 87121-1958
Pho 505-831-7509
Fax 505-836-4834
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-----Original Message-----
From: Stephen R. Gregory [mailto:[log in to unmask]]
Sent: Tuesday, August 01, 2000 7:22 PM
To: [log in to unmask]
Subject: Re: [TN] Solder splash detector
In a message dated 8/1/00 5:47:48 PM EST, [log in to unmask] writes:
<< Let me know if i missed the plot somewhere,
Ed & Steve have had close encounters too, 'm sure
paul >>
Hi Peter!
Paul has everything right...not much out there to stop a splash when it's
already going. We've all done it before, yours truely included...turning the
pump switch on and then noticing almost at the same time the pump rpm's are
at warp speed. As quick as you can yell; "OH SH*T!!!" you've got solder
splashed all over the place. It usually happens only once or twice to a
person, then you know that everytime you flip the pump switch you'll check
to
see the pump is set to zero before powering it up...I don't think there's to
much out there that will prevent "mental lapses" such as that, I'm including
myself in that, because like I said, it's happened to me before.
One thing that I've done to help the clean-up from such a "faux pax" (it's
going to happen) is to the line beneath the floor of the solder-pot with
cardboard....much easier cleaning-up spilled solder, instead of trying to
scrape it of a tiled floor.
It seems some machines are more prone to pump itself on the floor than
others... don't want to mention names, but the machine I have now won't do
that unless someone is really psychotic...
The other times that I've had a problem with solder splashes, a detector
wouldn't made any difference at at. One was fairly recently (within the past
year), when myself and another technetter lowered a pump and nozzle assembly
into a freshly charged pot (the nozzle had been out in a Oklahoma
rainstorm,
tornado warnings and all) we thought we had dried the thing out completely,
but surprise, surprise! As soon as the 500-degree solder hit a pocket of
moisture inside a passage of the turbulent nozzle, we had a fountain of
solder spray hit the ceiling...never seen a ol' guy with a bumb knee move so
fast! Neither one of us was burnt (thank God!!). The time before that was
when I was out in California...Loma Prieta earthquake...lost about 100-200
lbs out of a Econopak pot...pumps weren't even on then...hehehe.
-Steve Gregory-
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