Electronics Forum | Mon Jan 24 04:26:32 EST 2005 | Hannu
Morning all, Has anybody done any pin in paste job with a dispenser? I read somewhere that the needle i.d. should be slightly larger than the hole diameter, but with holes of 1.4 mm I would have to work with a very large needle indeed. How does past
Electronics Forum | Fri Feb 11 19:07:16 EST 2005 | primus
We are also looking for AOI machines, pre- and post-reflow. We already tried one machine from the UK (I don't remember the name, I perfer to forget we ever had it) and they told is it would do everything we wanted. Maybe so, but not well enough. It s
Electronics Forum | Sat Feb 12 13:40:27 EST 2005 | etienne
As I was explaining in my thread, the things that you have to look for when buying an AOI is the false calls rate (which you described perfectly) vis a vis the money and time you want to spend. We bought our machine after that we evaluated some. As y
Electronics Forum | Mon Jan 24 18:04:46 EST 2005 | Dreamsniper
=130�C as per IPC-4104/21 What will happen if I expose the PWB Assembly with components to a temperature of between 135'C to 152'C, which is above Tg, for 1 hour? Will there be delamination or possible damage to my PWB? What about with the rests of
Electronics Forum | Mon Jan 24 22:28:57 EST 2005 | davef
In addition to the potential problems you mentioned, add: * Barrel cracking of PTH and via. * Lifted pads. * Warped boards. And the reason you're not using a solder fountain to to solder this connector is? Or use an old trick we've done here on SMT
Electronics Forum | Fri Jan 28 12:29:01 EST 2005 | Bob R.
We use the exact same method Chunks outlined for evaluating just about anything we're going to roll out worldwide, whether it's a material or a machine. List your factors (print speed, solder spread, etc), assign each a weight, evaluate each paste a
Electronics Forum | Thu Feb 10 14:27:07 EST 2005 | cyber_wolf
First of all, whom are you getting it from ? Mydata, or a used equipment broker. If you can tell me what machine type you are looking at, then I can tell you what to look for. (MY-series, or TP series) Most important things right off the bat: *Machi
Electronics Forum | Mon Jan 31 11:34:58 EST 2005 | Chunks
Testing vias may be acceptable, but not preferred. If you do test by via, it�s a last resort type of thing. Vias are always a pain in the real world. Generally, they are soldered by wave, so they aren�t always doomed correctly, plus residue build-
Electronics Forum | Mon Jan 31 13:38:17 EST 2005 | mrclean
This build up is likely related to the defoamer. Defoamers are typically based on waxes and/or high molecular weight Hydrocarbons. As defoamers only need to work on the exposed fluid surface, not a lot of defoamer is needed (unless you are using
Electronics Forum | Mon Jan 31 15:02:52 EST 2005 | gs
First of all ask your Suplliers to provide you SMD in Tape & reel, second point, you can ask Service for Tape & Reel or in case components are not so many, you could asses ef convenient to buy a sinple maual Tape & Ree machine and do it inside your f
