Electronics Forum | Tue Aug 03 08:38:42 EDT 2004 | davef
Conductive epoxy is usually specified as less than 6:1 aspect ratio fill capable, while non-conductives are 10 to 14:1 (depends on which brand and who you ask).
Electronics Forum | Thu Jul 14 16:08:07 EDT 2005 | russ
Stencil thickness is related to PCB design and is not related to paste type. If you release with a 8 mil stencil then use an 8 mil stencil. Of course there are pastes that release bteer than other and what not but use area and aspect ratios to dete
Electronics Forum | Thu Dec 08 09:47:46 EST 2005 | slthomas
I'm with Grant on the .005" foil thickness. The key is to keep your aspect ratio (aperture width/foil thickness) over 1.5, laser cut, and I like trapezoidal aps. too.
Electronics Forum | Wed Mar 07 14:19:04 EST 2007 | cyber_wolf
We use quite a few Invar stencils. I have several stencils that have apertures that fall below aspect ratio that work very well.
Electronics Forum | Tue May 22 20:27:34 EDT 2007 | davef
What are the area and aspect ratio of the apertures that clog? When you print, you should be able to fit at least 4 of the mean sized solder sphere across the width or diameter of your smallest apertures.
Electronics Forum | Wed Aug 25 15:24:07 EDT 2010 | mikesewell
Whatever you would normally use to print that size part on the pcb should work. Same aspect ratio rules apply for release.
Electronics Forum | Sun Dec 02 11:06:29 EST 2012 | zero260n4
Where might I obtain this software that performs the aspect ratio for stencils, I could use Excel but why reinvent the wheel if there's something better
Electronics Forum | Wed Jul 24 09:54:49 EDT 2019 | amitthepcbguy
Typically, the reliability of PCBs suffers significantly due to the increase in aspect ratio. It is not preferred to opt for high thickness boards. However, I would like to point out that your assumption seems to be wrong as board layers do not direc
Electronics Forum | Thu Mar 18 07:19:39 EDT 2021 | bukas
maybe. some machines require screen aspect ratio of 4:3 as CRTs are 4:3. If you find that 16:9 doesnt work try 4:3 if you have one, they are rare.
Electronics Forum | Thu Oct 07 12:42:13 EDT 2021 | ervin
Hi I addition to the mentioned electrical effects, there are also reliabilty issues with increasing the board thickness, such as increased aspect ratio for the vias or registration difficulty
