Hi Bill,
My first guess is that the components hit the nozzle of the wave
soldering machine. The only other suspect that I can think of is the
quality of the glue, maybe something is wrong with this particular
syringe or production lot ? Have you tried a fresh syringe ?
Daan Terstegge
Thales Communications
Unclassified mail
Personal Website: http://www.smtinfo.net
Regards,
Daan Terstegge
PCB Assembly Department
Thales Communications
Tel +31(0)35 524 8297
Fax +31(0)35 524 8181
[log in to unmask]
**This message is Unclassified**
>>> [log in to unmask] 01/22/03 04:09pm >>>
Hey folks,
I've been in this business for over 20 years, and thought I had seen it
all,
but this is a new one. We're having problems with our glue/wave solder
process. Parts are falling off the board.
"That's not new," you say?
"Check your handling, stupid," you say?
"Check your glue cure process, stupid," you say?
Yep.
Shear tests indicate that our glue process is working.
We're using a product that is very widely used in the industry,
following
the manufacturer's recommended cure profile.
And yet, parts fall off -- as they go through the wave solder machine.
Adhesive stays put. Has a flat surface where the part used to be.
Pads are beautifully soldered...just no parts there.
And we have verified that the parts are present before the wave.
Across chip suppliers and part numbers, across solder mask types,
across PWB
vendors.
Is it just me?
Is the business finally catching up with me?
Should I give up and become a high school band director?
Your suggestions are welcome!
Bill Page
Kenosha, WI
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