Electronics Forum | Fri Aug 03 11:09:33 EDT 2007 | realchunks
Well, Ray Rassmussen believes that "IT" may put China on it's ear. Not sure about any of you, but I never felt the need to splash water on my face whilst reading this white paper. Hate to see how he'd react to seeing a board going over a 500 degree
Electronics Forum | Wed Nov 25 01:00:54 EST 2009 | henry_usa_stencils
The design of the opening apertures for the glue stencil and the metal thickness.Its is very important. The Engineer of the stencils supplier have to look into the height of the components and the gap of the 2 leg(pads)and give the assemly house an s
Electronics Forum | Tue Jul 31 15:29:45 EDT 2001 | hinerman
Research was done into the deflection of a totally unsupported (topside) PCB of 0.050" thickness. A dial indicator was placed on the surface and the tooling was set. The deflection ranged from 0.005" to 0.007". This is minor when you consider th
Electronics Forum | Tue Nov 09 13:12:26 EST 1999 | Dave F
Steve: Sure, but let's figure it out for you!!! ;-) Here�s some sample calculations. Your results may vary, void where prohibited, etc 20 PITCH: Pinched aperture volume: 0.010"X0.050"X0.005" = 2.5 uin^3 Zippered aperture volume: (0.015"X~0.5)
Electronics Forum | Tue Mar 16 03:28:18 EST 1999 | Scott Davies
Al, In general, I would agree with Justin, i.e. contact printing with a 0.007" stencil is great for 0603 - 1206 size components. However, we also place 0.025" pitch QFP components. We use a 0.006" laser cut stencil and I have found through trial an
Electronics Forum | Mon Jul 27 13:59:11 EDT 1998 | Robert Steltman
We are about to run our first BGA devices and would appreciate some confirmation on a few points. First some details: PCB & Device: ============= 1) 16 layer (4 power, 4 gnd, 8 signal) 2) gold on nickel finish 3) ceramic BGA with eutectic balls Refl
Electronics Forum | Mon Jul 28 17:13:28 EDT 2003 | Ryan Liao
Hello dear all: I have some problems with the CP642's vision process system . When the machine is working, sometimes the vision process system will appearance the error message. Error code :��1CA0A007�� Element code: FFFF Segment code: 0000 This s
Electronics Forum | Thu Jan 13 23:31:19 EST 2005 | KEN
Many of the Engineers from Dynapert / Precima went to Philips EMT. You can see many simlarities in feeder and nozzle designs. They (Philips) have a signifficant history in the P&P arena. I have 3 GEM emeralds from 1998 that continue to calibrate at
Electronics Forum | Tue May 17 08:00:26 EDT 2005 | Bob R.
We went through this with one PBGA supplier recently and they were able to get the problem under control by fixing some of their molding processes that were inducing residual stresses. You can really see it in a thermal moire where you measure warpa
Electronics Forum | Fri Dec 21 15:50:54 EST 2007 | rwyman
Hi smtdude- I'm no expert at PoP (yet!) as we've only done a few weeks worth of experiments for a new customer but what i can tell you is 25-50% of the ball height (not diameter) is a good rule of thumb for the flux depth, at least to start. I can s
