Electronics Forum | Thu Dec 19 13:17:20 EST 2002 | gramsey
Huh?! The area of a square that fits in a circle is clearly less than the circle. Paste release is better in a circle than a square because the circle has maximum area per perimiter lenght.
Electronics Forum | Thu Dec 19 13:23:11 EST 2002 | gramsey
Now, this is good solid advice. If following this advice does not help there is something wrong with 1. the paste (reology failure) 2. the stencil (rough walls) 3. the board (bad design or fab) (in order of likelyhood)
Electronics Forum | Thu Dec 19 13:25:19 EST 2002 | russ
We actually look at it like this, The area of a circle that will fit into a square is less. (slight overprint with square aperture with radiused corners) Russ
Electronics Forum | Sat Dec 21 02:06:22 EST 2002 | P.SANKARA NARAYANAN
The easiest simplest solution i can think of is the Print plate from OKI. Why dont you try the same. Visit http://www.metcal.com. Instead of printing on PCB you can print on the BGA.
Electronics Forum | Mon Dec 16 15:20:29 EST 2002 | sueph
Randy, are you baking initially for surface mount? These boards I'm talking about are just thru hole, so there would not be any bake between baking for part marking and wave solder.
Electronics Forum | Mon Dec 16 15:38:17 EST 2002 | Randy Villeneuve
No parts or boards are baked unless they are moisture sensitive and were left out too long and that is for reflow only. In your case there should be no reason to bake becouse the boards should be vacuum packed as they come in as well as any moisture
Electronics Forum | Mon Dec 16 17:38:56 EST 2002 | davef
Baking boards in a nonvalue added activity. Quit doing it!!! As a routine production activity, it is either: * Totally unnecessary ... OR * Band-aid to cover for problems in fabrication, purchasing, or storage methods. Search the fine SMTnet Archi
Electronics Forum | Fri Dec 27 15:03:40 EST 2002 | cnotebaert
Cencorp is another, they make routers, we purchased one of these just to depanelize boards. most boards we depanelize are already pre-routed with tabs holding hte boards together. the machine works great.
Electronics Forum | Tue Dec 17 16:33:26 EST 2002 | davef
I agree with Russ. The hand soldering temperature depends on: * What you are soldering. * What solder paste you are using. * What are the capabilities of your soldering iron. That being said, kind look at 580-650*F as kinda, sorta typical.
Electronics Forum | Wed Dec 18 15:07:25 EST 2002 | cal
ACI (www.aciusa.org) Does have a real time SPC interface for soldering Irons. MSM product. Provides you with soldering temp, dwell time and other useful info. This is key if needed to track process closely Cal
