Electronics Forum | Tue Nov 09 12:00:41 EST 2004 | Dreamsniper
Problem: PQFP208 Pad Width specified as 11.8 thou, PCB came and they are 9.5 thou. Component Lead Width is 10 thou to 10.6 thou. Operators have difficulty aligning and inspecting. Issue: Fed back to PCB Fab House and they said IPC accepts +/- 20% fo
Electronics Forum | Tue Dec 07 10:59:46 EST 2004 | mevishu
Dear all. I am working on project to improve the productivity of palcement machine of my company .My prime cocern is CPH i.e components placed per hour. Rated capacity is 48000 componets/hour and what we actually acgieve is 23000. No doubt this mu
Electronics Forum | Tue Jan 04 10:00:19 EST 2005 | Carmichael
No mystery there... The balls are reflowed by conduction of heat from the package itself and the backside preheater just as in any other rework machine. The laser is just another method of precisely heating the entire package. The advantage is overa
Electronics Forum | Wed Jan 05 08:58:13 EST 2005 | davef
Q1. Is it enough to use only water while cleaning or is it necessary to use any additional chemistries and/or saponifiers as well? A1. It depends on: * Flux residues that you're cleaning * Standoff of the components * Cleaning technology [we've neve
Electronics Forum | Sun Mar 05 14:08:33 EST 2006 | grantp
Hi, Your right, and the MYDATA's are much easer to setup, and a lot of it's got to do with them knowing which way a part is oriented, and it makes it a lot easer to know by looking at each part if it's rotated correctly. The Fujis don't do that, and
Electronics Forum | Mon Jan 10 16:14:17 EST 2005 | fmonette
Hi Gary, With plastic BGAs it is more difficult to remove the trapped moisture because of ground planes in the substrate. If your parts have been sitting around for a long time they may be soaked with moisture and in some cases the 48 hours bake cy
Electronics Forum | Wed Jan 12 12:06:55 EST 2005 | Grant
Hi, The MYDATA is a very flexible machine, however it's slow as a chip shooter, and really needs Myspeed to work to get as much speed as possible. It's also wasteful to get chip placement speed because you need to repeat feeders of the same componen
Electronics Forum | Thu Jan 13 01:15:35 EST 2005 | Grant
Hi, What do you mean by flex machines? You've hit the nail on the head with the cause of the problem, but I am interested in what you mean about flex machines. Are you talking about a machine that can change the placement head entirely? Our problem
Electronics Forum | Sat Feb 05 23:54:37 EST 2005 | sms_don
Hello, I found the previous discussion of lead free profiles on 5 zone ovens very interesting. I had the same concerns, but have recently succeeded in creating profiles on a 5 Zone QUAD oven that have eliminated solder splatter or Solder on Gold w
Electronics Forum | Sat Feb 26 22:32:42 EST 2005 | siverts
The directive is called RoHS. Meaning that is not only the lead that is the issue. The materials need to whithstand a hihger temperature, not only delta T is an issue (but huge). Moisture sensitive devices: how to handle these? You will see an increa
