Larry,
The adjustable angle pallets I have worked with have
2 components:
1 - The carrier. Fixed outer dimensions, with a large circle
cutout in the center. This portion is universal in nature.
2 - The circular insert that drops into the carrier. This
portion is board/assembly specific, and can be rotated to the required
angle.
The good ones will have the angle marks milled into the
carrier cutout perimeter, with a reference mark milled into the circular
insert. This allows repeatability in setting to the proper angle when
changing from one assembly insert to another.
Mike McMonagle
Senior SMT Engineer
Telxon Corporation
www.telxon.com <http://www.telxon.com>
-----Original Message-----
From: Larry Koens
[mailto:[log in to unmask]]
Sent: Wednesday, October 04, 2000 9:49 AM
To: [log in to unmask]
Subject: Re: [TN] Wave soldering
bottom SMT, there's hope!!!
I understand that you can adjust these
pallets to any angle. But, are these
pallets dedicated to a certain assembly
or are they universal and can used on
various projects?
Larry
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On
Behalf Of Stephen R. Gregory
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=e25a88
c4.8e904&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=e25a88
c4.8e904&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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