Electronics Forum | Mon May 24 13:33:46 EDT 1999 | Dave F
| We are running a number of boards with 8-10 25 mil PQFPs on board. Our process is mature with at least 3 years experiance and statistically few opens on the QFPs. Our beloved purchasing department has chased the almighty $ and changed FAB vendor
Electronics Forum | Sun Mar 07 09:24:55 EST 1999 | Scott Cook
| Hi Ya'll... | it's a Soltec Prisma and the conveyer keeps jamming. What it's doing is up at the exit end where the drive motor is, the chain keeps wrapping itself around the drive sprocket and jamming...this is on the backside rail, the frontside
Electronics Forum | Tue Aug 07 20:51:43 EDT 2001 | davef
Sowaza BIC? Ru the ball point pen people? Know no sites, like thet, but let�s see what we can do here. Wedabomb. First, rather than defining the controls your suppliers must use to produce your product, why not specify a DPMO rate er suppin like t
Electronics Forum | Thu Oct 18 18:39:15 EDT 2001 | davef
Responding to your questions ... RELIABILITY OF 1% SILVER SOLDER PASTE: It�s as good as the next solder paste, all other things the same. Look at your back articles by Jennie Hang in SMT magazine. I want to say she wrote an article on the topic i
Electronics Forum | Tue Jan 08 17:33:26 EST 2002 | davef
You didn�t identify the type of tape you use, but Kapton or similar tape is not an effective method for attaching thermocouples. Search the fine SMTnet Archives for alternatives and comparison of methods. Two methods for mechanically attaching ther
Electronics Forum | Mon Aug 02 09:26:15 EDT 2004 | davef
Q1: How do you define torque setting for screw? A1: Talk to people at your nut supplier. Some nut suppliers post torque tables on the web. For instance: http://www.thelenchannel.com/1torque.html http://www.marfas.com/Ttorque.shtml http://www.pac
Electronics Forum | Wed Dec 13 14:15:54 EST 2000 | Chris
I have a product where an IC is soldered using a stencil which puts down way too much paste. The result is massive bridging. Anyway, one of my coworkers claimed he could eliminate the bridging by baking the circuit board in an oven for 5 min at 90
Electronics Forum | Mon Nov 06 10:29:28 EST 2000 | Dean Stadem
All of the replies have merit. Here is another one. Because the cause of the tombstoning is wetting forces that are imbalanced, and one end wets faster or more readily than the other, the 0402 lifts up on that end easily because of its low mass. Incr
Electronics Forum | Fri Jun 06 07:37:38 EDT 2003 | mattiasw
Hi! I just wanted to shortly share my experience with AOI machines. We have a VisionPoint from Diagnosys (Same software as in the Photon dynamics machines) and the machine is doing it�s job really good actually...BUT! The machine building quality is
Electronics Forum | Sat Mar 25 10:13:18 EST 2000 | Robert Hutton-Squire
I am assembling a board with 2 x ALTERA FineLine PBGA devices. (256-pin and 100-pin) These devices have: surface pad size = 0.41mm (16) ball size = 0.48mm (18.9) ball pitch = 1.0mm (40) For my FIRST attempt I screen printed a fine pitch water solub
