Steve, Both Indium SMQ92 and Aim 293+ will not slump at all. (I actually measured a negative slump, but the amount was within experimental error). I'm sure there are others, but the slumpers certainly out number the non-slumpers. Thanks Ryan Grant Advanced Technology Engineer MCMS (208) 898-1145 [log in to unmask] > -----Original Message----- > From: Ron Waugh [SMTP:[log in to unmask]] > Sent: Tuesday, September 26, 2000 2:48 PM > To: [log in to unmask] > Subject: Re: [TN] Wave soldering bottom SMT, here be the "Jewel"... > > Steve, > > I have not done the solder analysis on this solder paste yet, but have a > lot of > documentation on AlphaMetals new Omnix paste "OM - 5000". It is a > No-Clean > paste that is guaranteed not to hot slump....."supposedly the only one on > the > market...so far". This may help you in your endeavor to paste and > dispense, > without the defects of your previous experience. Hope this helps! > > Regards, > > Ron Waugh > > > > ______________________________ Reply Separator > _________________________________ > Subject: [TN] Wave soldering bottom SMT, here be the "Jewel"... > Author: "TechNet E-Mail Forum." <[log in to unmask]> [log in to unmask] at > Internet-gateway > Date: 9/26/00 2:43 PM > > > 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. > > I also ask myself what new problems might be introduced dispensing > adhesive. > The last "good" dispenser I've used was a FUJI FGL-V...and back then we > did > have some issues with epoxy bleeding on to the pads with SOT's as well as > the > "tail's" stringing onto the pads when things weren't working as well as > planned... > > One last issue we talked about was an experience I had at a past company > where we printed paste and dispensed adhesive. What would happen during > reflow was when the paste would hot slump, some of the paste would embed > itself into the epoxy, and then cure...so we had all these little > solderballs > cured into the epoxy. Our customer wouldn't take the boards like that, and > we > wound-up eating them... > > -Steve Gregory- > > ############################################################## > 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 > textin > 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 > ############################################################## > > ############################################################## > 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 > ############################################################## ############################################################## 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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