Electronics Forum | Fri Jul 05 11:45:47 EDT 2002 | stefwitt
I have seen the U-shaped aperture on a customer site, being used with success. However, the problems with the stencil and the �loose� tabs where reportedly a reason to search for different aperture designs. Before this company could test their ideas
Electronics Forum | Wed May 29 11:11:16 EDT 2002 | jax
Are you using Diamond apertures to achieve a volumn you cannot get through round ap's?
Electronics Forum | Wed May 29 13:10:55 EDT 2002 | wilcoxito
Diamond apertures were just an idea proposed by my plant manager. They are not necessary, by far. Thanks for all your input.
Electronics Forum | Fri Oct 04 11:46:31 EDT 2002 | mzaboogie
Hi Dave, No we are placing these parts on hard boards. Thank God! Thanks Chris
Electronics Forum | Wed Mar 20 19:58:59 EST 2002 | davef
You based the aperture size on LxBxH. Where did you get the LxBxH? Obviously the thickness of the stencil is kinda fixed. Who gave you the other numbers? Consider searching the fine SMTnet archives for background on aperture design.
Electronics Forum | Tue Jun 04 22:46:21 EDT 2002 | davef
Factors to consider are: * Squeegee speed * Squeegee pressure * Separation speed * Stencil thickness * Stencil aperture fabrication method * Stencil aperture shape * Paste type * Stencil under-wipe frequency Search the fine SMTnet Archives for a thr
Electronics Forum | Sat Sep 14 20:42:48 EDT 2002 | kenbliss
Hi Scott Thanks for your comments, you stated "The highest attributer was clogging apertures in fine pitch, resistor networks, and BGA, Micro BGA areas" was this do just to the size of the aperture or bad or old paste or debris from inadequate clean
Electronics Forum | Wed May 29 17:17:49 EDT 2002 | wilcoxito
As far as aperture dimensions go, I found a technical note written by Micron that recommends using "square apertures with sides equal in length to the diameter of the PCB pad. The corners of the square should also be slightly rounded, and the apertu
Electronics Forum | Wed Jul 03 07:29:05 EDT 2002 | jax
Where did you find this article about "U-shape" apertures? I believe it is simply talking about rounded corners on the inside of a normal square aperture. ( resembling a filled in U ). It kinda follows the same ideas behind the home-plate design, wit
Electronics Forum | Fri Oct 18 22:32:20 EDT 2002 | mdm4ua
If you have room try putting a small piece of tape on the bottom of the stencil right next the aperture that is giving you the problem. The added height of the tape (Kapton tape is usually about 3 mils thick) will likely give you a heavy enough depo
