Electronics Forum | Wed Jun 22 12:29:56 EDT 2005 | Rob
Hi Grant, I think I've got one somewhere - I'll have a look later in the week and post it out to you. Cheers, Rob.
Electronics Forum | Sun Jun 26 12:03:38 EDT 2005 | geb
Re: 23-Jun-05 16:09 (pr) It is a pad, cos the fids on the PCB are in a different place to the ones on the stencil.
Electronics Forum | Thu Jun 23 22:30:31 EDT 2005 | wjxingggg
poor soldering of PCB. > unfit stencil hole of QFN > incoming problem for this component >...... What is your opinion? or what can I do for the next step? Thanks again.
Electronics Forum | Sat Jun 25 10:04:08 EDT 2005 | ktron
Hi MSK, Stencil thickness: 5mils with laser cut Smallest pitch: 20mils Underscreen cleaning frequency: 10 bds per cleaning Note: We have decreased the cleaning frequency from 10 boards to 3 bds to reduce solder bridging after printing Regards,
Electronics Forum | Mon Jun 27 11:24:03 EDT 2005 | russ
What size paste roll do you have on your stencil? It should be about 1/2" in diameter. What type of paste are you using? I have found that certain Mfgrs have this problem with some of their formulations. What typoe of printer and what is your squ
Electronics Forum | Tue Jun 28 21:54:44 EDT 2005 | davef
Fabricators take different approaches in developing paste that is more or less prone to solder balling. That being said, you should be able to overprint 250 thou, no problem. Prove this to be correct by printing paste on a scrap board with an obsol
Electronics Forum | Wed Jul 13 10:47:41 EDT 2005 | Tom
Thanks a lot folks! Seems like 1:1 in generally accepted. However Cookson/Alpha seem to be the only ones complicating homeplates to "roundy" instead of "triangular". I'll do some tests... Thanks again!
Electronics Forum | Wed Jul 13 12:27:40 EDT 2005 | Bob R.
Are you seeing solder balling on your discretes when you print 1:1? Are you washing your boards?
Electronics Forum | Wed Jul 13 14:42:25 EDT 2005 | Bman
I know this is asking a lot, but could you please tell us what WS LF pastes you have looked at? What issues are you seeing with these WS pastes? Thanks
Electronics Forum | Wed Jul 13 09:01:48 EDT 2005 | dougs
if your vacuum is getting through your board then it sounds like your vacuum tooling is wrong. you shouldn't have vacuum points at areas of the board where there are PTH's or via's.
