Electronics Forum | Thu Aug 21 09:34:57 EDT 2003 | davef
Woa. The more paste that you put a a BGA ball, the more likely that you'll bridge between balls. Why do you need to compensate for the size variance in BGA balls? How does using a 8 thou thick stencil to compensate for ball size variance? Fine pi
Electronics Forum | Wed Aug 20 21:30:56 EDT 2003 | paulm
Our company if currently reviewing our BGA Screen Printing Process. The problem we are trying to eliminate has to do with BGA Ball Size Variance. Some of our vendors are allowing a +/- of 0.004" in ball size. This would allow for the possibility of a
Electronics Forum | Wed Sep 01 12:07:31 EDT 2010 | davef
Printing solder paste * Use single stroke, on-contact print cycle * Ensure the substrate is well supported, especially under areas of fine pitch print. * Select pressures of about 1- 2 lbs per linear inch of squeegee blade [Set squeegee pressure hig
Electronics Forum | Thu Sep 29 20:26:58 EDT 2005 | DasonC
Any aperture/stencil thickness suggestion to provide a rigid solder joint for 0.8mm pitch PBGA with 0.4mm ball diameter. The pad is based on IPC7095 and it is 0.3mm. Thank!
Electronics Forum | Wed Sep 01 06:38:37 EDT 2010 | grahamcooper22
Dear Leeg, Generally the faster your print speed the more down pressure you need on the blade to roll the paste and wipe the stencil surface clean. Pastes with higher viscosity need more pressure at slow and high print speeds. Too much pressure cause
Electronics Forum | Tue Dec 16 04:20:51 EST 2003 | ex maintain leader
Hi Cesar, I' think is not soo critical, but take cre my 5Y experiences are focused mostly bad designed pcb's on outrunning project wich are transfered to eastern europe or to mini factories in austria. at wery old dek265 I see 45 degrees squeegue
Electronics Forum | Wed Apr 28 12:33:05 EDT 2004 | Dave G
Rob, Don't know if you bought an "H" tower with your UP or not. You did you can have a dedicated support plate made from Aluminum that has pockets machined out to match components on the bottom of the board. (Most of the workholder guys can set you
Electronics Forum | Thu Feb 19 00:31:55 EST 1998 | Larry
The type of training I am looking for is things like micro BGA, flipchip, COB, new processes and techniques, ect. I already work with things like fine pitch QFP's, high mix double reflowed boards every day. I live in Vancouver, but I can drive to Sea
