Hello all, I've been watching this thread for a few days now hearing about how solder paste can be dispensed from an automated system. My experience has not turned out very well with only very limited success. We have a Camalot 1414, even bought the special displacement pump designed for this application and attempted to dispense solder paste. I just could not get the system to be repeatable. Once I had a set up, repeating the next day or even the next hour was impossible. I tried different pastes, different particle sizes, needle sizes, etc. etc. One of the biggest problems that I had was coining. This is where the particles compressed to form a solid plug where the paste entered the dispensing needle. I gave up on this method, settling instead on using microstencils to apply paste. I would like to know of anyone who has had success with dispensing solder paste. I would like to know some particulars about the process. (paste, needle size, pump pressures, etc) I would not mind trying this again if I could just get some help with this. However, if you've never done this and you're thinking that this is a viable process, I am advising to be very careful about sales pitches that claim that solder paste dispensing can be done. I don't think that it is a repeatable process. Bill Kasprzak Moog Inc., Electronic Assembly Engineering > -----Original Message----- > From: Mike Fenner [SMTP:[log in to unmask]] > Sent: Tuesday, June 12, 2001 3:47 AM > To: [log in to unmask] > Subject: Re: [TN] Looking for a "special" solder paste dispenser > > Solder paste can be dispensed quite well from these systems provided that > proper attention is paid to correctly specifying the material. Solder > pastes > are inherently more difficult to dispense than adhesives but if particle > size range [and distribution in the specified range] is correctly done > with > the right vehicle rheology, consistent dispense at quite high rates is > achievable. > > Mike Fenner > Indium Corporation of Europe > > Hi, Craig, > > You could try Asymtek, part of the Nordsen group, which specialises in > fluid dispensing technology. They seem to be the market leaders. They do > underfill, adhesive and flux dispensers, and though I haven't seen a > solder > paste dispenser in their list, they may do one. Or try EFD - they do have > a paste dispenser, but you'll need to decide its accuracy for yourself. > > Pete Duncan > Hello Technetters, > > For research and development purposes, I am looking for a machine that > dispenses solder > onto a board WITHOUT the use of a solder stencil. The speed is not as > important as accuracy and > quality of work. > > Do you know of a machine like this? If so, how can I find one? > > Thanks for your help, > Craig > --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------