Electronics Forum | Thu Sep 15 17:39:08 EDT 2005 | stepheniii
I just wanted to add I'm not saying there is no egineering aspect to this, just that it sounds like it is more to do with your customers perceptions. Ask why they think it could be a problem. Maybe they have had previous experience with it before. I
Electronics Forum | Tue Sep 20 10:32:25 EDT 2005 | slthomas
I would say it depends on the process requirements for the board and the reliability requirements as has already been mentioned. If you do two-sided reflow you might allow for fewer rework attempts, for example. If it's a medical device you might on
Electronics Forum | Fri Sep 23 03:52:41 EDT 2005 | dougs
Hi, Does anyone know if it's possible to place BGA's with pitch 0.5mm and ball diameter 0.25mm on a siemens F3. the manual says that smallest pitch on BGA's is 0.56mm. Siemens won't commit a yes or no, as you'd expect, but i'd have thought it w
Electronics Forum | Mon Sep 26 10:06:06 EDT 2005 | stepheniii
Make sure the stencil lined up perfectly in the middle all along the width of the board. Everytime someone has told me that a stencil doesn't match the board, they were not critical enough on alignment. Usually they would say one corner is perfect b
Electronics Forum | Fri Oct 14 07:56:32 EDT 2005 | davef
On understencil cleaning: * It's a good idea to do this to reduce printing defects, as you say. * We clean dry. * Our cleaning frequency varies acording to product, maybe ranging from 10 to 20 prints, averaging around 12 to 15. * As long as cleaning
Electronics Forum | Tue Oct 11 18:35:59 EDT 2005 | stepheniii
How big a tank do you have at the compressor? Basically the bigger the better. You will still have the same duty cycle ratio but the compressor won't be cycling as fast. Hopefully someone here knows what a good size would be. And when you say "kic
Electronics Forum | Wed Oct 12 11:08:12 EDT 2005 | Mike
Hly, The solder ball in your picture looks just like the countless BGA solder joints that I�ve produced over the past 8+ years. We've had a good number of these joints X-rayed, cross-sectioned, and thermally stressed. Some say that the stretched loo
Electronics Forum | Fri Oct 14 13:12:30 EDT 2005 | Mika
Thanks Patrick, I our mixed standard HASL/RoHS production area; our customer have choosen Ni/Au plating for their RoHS boards. What You are saying (3.); is that we should be more attentive on the quality of the pcb manufactory. Even if our customer
Electronics Forum | Fri Oct 21 12:19:36 EDT 2005 | ratsalad
I can see this being useful to a company that needs the ability to do one-day turns on prototypes. The type of situation where your customer shows up at your door with two bags, one is a bag of parts and the other is a bag of cash and they say they
Electronics Forum | Wed Nov 02 01:53:41 EST 2005 | pavel_murtishev
Hello, Thank you for answer. We are using second hand machine. What do you mean saying that �stencil is not height on all 4 corners�? Does it have some inclination between corners? I mean that three corners of stencil are matching with PCB fine and