Electronics Forum | Tue Dec 23 17:34:07 EST 2008 | davef
We hear you talking two main issues: 1 Solder paste release 2 Thoughts on using two passes of solder paste on the stencil 1 Solder paste release * Check your aperture & aspect ratios [Search the fine SMTnet Archives for more] * Do a better job with
Electronics Forum | Fri Oct 27 11:34:30 EDT 2000 | Steve A
Wister, I agree with the other comments as far as challenging the customer, and minding proper height/width or better yet area aspect ratios. Let's assume you need to go with a .012" stencil for arguments sake. Talk to your stencil supplier about h
Electronics Forum | Tue Oct 24 15:05:31 EDT 2000 | Steve Thomas
Maybe someone has a good explanation for this, but I'm wondering why your customer would dictate the equipment you use in your process. I thought typically contracts define the quality standards and you decide how to get there....show's you what I k
Electronics Forum | Tue Oct 24 19:50:34 EDT 2000 | Dave F
In response to your questions: * Will a polyurethane squeegee blade help? NO * Will a Pro-Flow head help? NO, but it might be a cool excuse to buy one. Unfortunately, you will look like a jerk, if you talk your boss into buying one and then he /
Electronics Forum | Thu Jun 02 08:33:42 EDT 2016 | emeto
I usually get a excel or word file from my stencil house with all the data you need. It give you aperture sizes, volume and Aspect Area ratio... DCode Shape X-Size Y-Size Pitch Volume Area Ratio Aspect Ratio Qty D1
Electronics Forum | Tue Jun 17 02:08:53 EDT 2003 | Bruce
What is the correct formula for Aspect Ratio? Thanks
Electronics Forum | Tue May 30 07:41:21 EDT 2006 | davef
Aspect ratio: The ratio of a via�s length or depth to its pre-plated diameter. So, in your case, either * 6=0.093/x, calculating x=0.093/6=0.016 as the smallest via hole diameter. ... OR * 6=y/0.01, calculating y=6*0.01=0.06 as the maximum board th
Electronics Forum | Tue Sep 21 13:12:56 EDT 1999 | Dave F
| My stencil thickness is 6 mil and we got qfp's with fine pitch. | how many percent should i reduce my stencil aperture using a 6 mil stencil for 0.5 mm pitch and 0.4 mm pitch ? | | thanks | Greg: I was going to link you to the IPC land pattern c
Electronics Forum | Tue Jun 17 08:52:39 EDT 2003 | russ
Aspect ratio = width of aperture divided by height. E.G. 6 mil stencil at 9 mil wide = aspect ratio of 1.5. Value should be 1.5 min. Area ratio - use when length and width of pad are roughly same dimension like for BGAs and 0805 and smaller R-nets
Electronics Forum | Wed Feb 18 14:45:33 EST 2004 | Mauro Pinheiro
I'm looking for a shareware software that I could use for specifying stencils (we are stencil users not manufacturers). I would like to enter some preliminary spec in a software form, such as: the smallest pad geometry on pcb (possibly selected from
