Electronics Forum | Mon Apr 07 12:21:02 EDT 2003 | davef
Russ is correct. A 5 thou thick stencil should give good release. Here's how you run through it: * You want at least 5 solder particles across the smallest aperture. So in your case, 8 thou wide, which equals to 0.20mm gives us 0.20/5=40 microns.
Electronics Forum | Thu Apr 17 10:38:02 EDT 2003 | davef
While Russ is correct that a little voiding is OK, your level of voiding [customer complains that the solder surface looks bumpy] doesn't give us the ol' warm and fuzzy about their process control. For background: * Search the fine SMTnet Archives.
Electronics Forum | Sat Apr 19 12:00:07 EDT 2003 | modeltech
I am completely new to SMT design and for my next project I plan to use SMT for the first time. Since production volumes of the PCB's will be low, hand soldering is definitely an option, and will be necessary for my prototype PCB assembly. My proble
Electronics Forum | Tue May 13 06:57:10 EDT 2003 | davef
Your vendor site is totally correct. 2Ag is an excellent solder, but it does nothing to prevent tin and gold from reacting chemically. An earlier poster is correct gold goes into solution in liquid solder very fast, less than a second. Gold and ti
Electronics Forum | Tue Jun 03 09:04:38 EDT 2003 | Mike F
Do a search in the archives on conformal coating and silicone conformal coat. A variety of companies make conformal coatings and the equipment to apply it. Coatings can be applied by dipping the board into the coating, brushing it on, or spraying i
Electronics Forum | Wed Jul 02 10:19:08 EDT 2003 | caldon
It kills me when people say "We have been doing this for 10 years and we will not change" guaranteed one day the shite will hit the fan when they have a screw up. We have ran into this before... Until/unless they are willing to work with you you wil
Electronics Forum | Fri Aug 08 12:46:02 EDT 2003 | davef
When I was a salty old fart in the Navy, we sent the babes from the turnip patch off on snipe hunts. Shear tests are [in my opinion] senseless. The shear stress you measure depends more on the shear rate and on the point where the force is applied
Electronics Forum | Tue Oct 14 11:34:04 EDT 2003 | Axl
As far as solder paste goes search no further! I have worked for some huge CM's as a Process Engineer and a lot of them have put thousands of hours of Engineering time and evaluation just to come up with the same answer every time. For no-clean it is
Electronics Forum | Wed Oct 29 14:58:51 EST 2003 | stockley
It's been a while since we placed a lot of 0402s, and I'm a bit out in the woods anyway so you ought to log on to http://www.siplace.com and get yourself a username and pasword so you'll have access to their DMS (documents system). I just did a quic
Electronics Forum | Wed Dec 17 09:53:26 EST 2003 | davef
IPC-2222 - Sectional Design Standard For Printed Board For Organic Printed Boards, Table 9-3 � Plated Through Hole Diameter To Lead Diameter Relationships will give you the standard information you require. If we can�t get proper hole fill after try
