Steve,
Mike and Graham are correct. A mother frame with a circular
daughter insert will allow other possible angles besides 45 degrees. A
variety of fixture manufacturers plus ourselves have manufactured these for
awhile now. If any other info. is needed please don't hesitate to call.
Chad Haima
National Sales Manager
S.P. Precision Intl
800-725-5388
www.spprecision.com
-----Original Message-----
From: McMonagle, Mike [mailto:[log in to unmask]]
Sent: Wednesday, October 04, 2000 4:59 AM
To: [log in to unmask]
Subject: Re: [TN] Wave soldering bottom SMT, there's hope!!!
Steve,
I believe that Garland Service Company
(www.gogsc.com <http://www.gogsc.com> ) makes a mother/daughter carrier that
allows you to rotate the board to any angle you would like. You may find
that an angle other than 45 degree will give you even better yields. Also
the outer carrier can be used with a variety of inserts, thus saving you
money if you have other assemblies down the road requiring the same
approach.
Mike McMonagle
Senior SMT Engineer
Telxon Corporation
www.telxon.com <http://www.telxon.com>
-----Original Message-----
From: Stephen R. Gregory
[mailto:[log in to unmask]]
Sent: Tuesday, October 03, 2000 3:52 PM
To: [log in to unmask]
Subject: Re: [TN] Wave soldering
bottom SMT, there's hope!!!
Hey everybody!!
Remember about a week ago I posted about a
little mixed technology board
(actives on the top, passives on the bottom)
that we do here that is laid-out
pretty bad as far as wave soldering goes,
and we have all this touch-up that
we have to do after wave?
Well there's hope. Ed Popielarski suggested
something to me that I didn't
think of. It was using a fixture that
oriented the board 45° to the wave...he
was able to get one for me to try just to
see if it made anything
better...and boy did it!!
Go to:
http://www.driveway.com/share?sid=e25a88c4.8e904&name=Pictures
You'll see two pictures there, one is:
With45.jpg, and the other is:
without45.jpg...let me tell you, the
Without45.jpg is pretty ugly. I still
did have a few defects with the 45°
orientation, but nowhere NEAR like I was
having before. Most of the defects are with
them pesky SOT-23's, and because
of the layout, I think there's always going
to be some touch-up...
I'm gonna be getting some dedicated 45°
fixtures made for these guys, and
just maybe be able to tweak things even
better!
Thanks Ed!!
-Steve Gregory-
> Hi ya'll!!
>
> I wished this little beast lent itself to
a selective wave soldering
pallet,
> but it don't. Go to:
http://www.driveway.com/share?sid=e25a88c4.8e904&name=
> Pic
> tures
> and look at "Funwave.JPG" to see what I
mean.
>
> You can see by the dime I put there how
big it is. This comes in a 10-up
> panel. There's about a dozen SOT's,
eleven-1206's, and around thirty-0805's
> on the backside. Up top there's
three-14-pin, one 8-pin, and one 6-pin DIP
> IC. There's also one 5-pin right angle
header, as well as two radial caps,
> one axial fuse, and a 3-pin PTH
transistor.
>
> The 14-pin straddle mount connector and
the two LED's have to be hand
> soldered because they also straddle the
board. The variable resistor on the
> backside also is hand soldered because it
can't be waved...fun stuff huh?
>
> We do get skips...mostly on the SOT's
that I've seen...Mike said he's seen
> some on the other passives as well. We do
get other defects because of the
> layout of things on the bottom. Those two
1206 caps in the upper right
> corner
> bridge quite a bit, and there's always
the excess solder on the leading
edge
> of a component that's oriented the wrong
way to the direction of travel in
> the wave.
>
> Me and Mike have been discussing this
wonderfully designed board. My
opinion
> is that using paste and adhesive may take
care of some of the problems, but
> with this board there's always going to
be touch-up.
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