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.
##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8d
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe: SUBSCRIBE TECHNET <your full name>
To unsubscribe: SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Keach Sasamori at [log in to unmask] or
847-509-9700 ext.5315
##############################################################
|
