oh, never mind, i see you did! -----Original Message----- From: Larry Koens [mailto:[log in to unmask]] Sent: Wednesday, October 04, 2000 7:49 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. ######################################## ###################### 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. 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