Electronics Forum | Wed Dec 08 10:03:48 EST 1999 | Ken Daniels
I have a problem dispensing chip adhesive while boards are still hot from the topside process. Has anyone else seen this? Is it a matter of my material, or the machine (Fuji GL 5) or the mask. When I try to dispense I get a great deal of stringin
Electronics Forum | Wed Dec 08 10:25:00 EST 1999 | John Thorup
Hi Ken Given the small mass of the dot I'm guessing that the adhesive is being flash cured by the heat of the board and the resulting semi-solid is unable to release from the nozzle like a liquid thereby causing your strings. Placing components on c
Electronics Forum | Wed Dec 08 11:12:07 EST 1999 | Brian W.
I think the number is about 80 degrees C. If the board is hotter than that, glue problems start to occur. John is right. The adhesive starts its cure process and its release from the nozzle is inhibited. Fans and coolers are one way yo go. If yo
Electronics Forum | Wed Dec 08 18:40:39 EST 1999 | shane.M
We encounter a similar problem, whereby stringing becomes a real problem when board temperatures are raised. We tried slightly larger dots, but this did nothing more than block the nozzles of the pick & place machine. You basically have only two opt
Electronics Forum | Mon Dec 13 21:05:34 EST 1999 | Curtis T.
Ken, we always build the bottom side of the board first. That also insures that there isn't any problems with the actives being reflowed and falling off in the glues curing process. By the way we do both paste and glue on the bottom of the boards t
Electronics Forum | Tue Nov 30 13:20:07 EST 1999 | John Thorup
Hello Wolfgang Try looking in the process guides section of Circuit Technologies web site. Their recomendation is to bond the jumper wire to the board within 6mm of the lead with hot melt glue, cyanoacrylic glue or adhesive dots. John Thorup
Electronics Forum | Sat Oct 29 09:10:17 EDT 2005 | davef
You're correct that Room Temperature Vulcanizing (RTV) adhesive is pretty much a cosmetic when it comes to securing components. Beyond that it contains silicone, which produces unsolderable connections in electronics. Further, many RTV seep acidic
Electronics Forum | Sun May 12 21:06:33 EDT 2024 | ttheis
Hot melt dispenser mounted to a cobot. If you don't want to do it by hand, have a robot do it.
Electronics Forum | Fri Sep 18 11:23:32 EDT 2009 | isd_jwendell
I know nothing about Xbox specific rework, but have a lot of experience with PCB repairs. "...maybe think its a bad idea now not knowing what im doing" Don't get discouraged, it's a learning process. If it was that easy everyone would be doing it.
Electronics Forum | Wed May 25 10:29:41 EDT 2005 | chunks
Hot melt from a glue gun. Works well but a pain if the part has to be replaced.
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