Electronics Forum | Mon Aug 16 04:34:54 EDT 1999 | Earl Moon
| | One of the DFM suggestions I've seen is to remove the solder mask web, i.e. the mask between pads on 20-mil QFP devices. The rational is that if the mask is thicker than the pad the mask can prevent the stencil from making intimate contact with
Electronics Forum | Mon Aug 16 04:47:04 EDT 1999 | Charles Stringer
| | | One of the DFM suggestions I've seen is to remove the solder mask web, i.e. the mask between pads on 20-mil QFP devices. The rational is that if the mask is thicker than the pad the mask can prevent the stencil from making intimate contact wit
Electronics Forum | Mon May 18 21:29:38 EDT 1998 | D.Lange
| I've tried every thing I can think of. Do you have any | Ideas? | What I have is micro balls on the gold fingers of | panelize boards. These balls only appear on the gold | finger. Or at least I can only find them on the gold | fingers. | What I
Electronics Forum | Tue Jul 27 06:04:16 EDT 2004 | cyber_wolf
Grant, I know of a couple places that throw their paste out at the end of the day. I have worked in SMT for over 15 years and we have never thrown paste out unless it was contaminated, or dried out. We have never had a problem. If you ask me, I would
Electronics Forum | Tue Mar 21 02:15:26 EST 2006 | pavel_murtishev
Good morning Dave, Here are some of my assumptions. Please correct me if I am wrong. 1. Mask opening. Due to mask to PCB misregistration mask is not always centered relative to pad center how is should be. Sometimes edge of the mask matches with ed
Electronics Forum | Wed Mar 14 09:44:06 EDT 2007 | Cmiller
We use cartridges, that way nobody can mix back in paste off the stencil and no air can get in period. Any paste that is still good to use when removed from a stencil at the end of a job is put into a small pink zip-lock baggy with the date written o
Electronics Forum | Sat Mar 14 09:12:59 EDT 2009 | davef
First, there is no good justification for getting solder on gold fingers. Second, it is well known that solder on gold fingers is unacceptable. So, shipping boards with that condition indicates sloppy quality practices at your CM. Third, that being
Electronics Forum | Tue Jun 07 08:31:57 EDT 2011 | bootstrap
I am building a rugged digital video camera product that essentially is just a sandwitch of 3 parts: #1: front piece is machined aluminum with C-mount thread #2: middle piece is 1/16" printed circuit board #3: back piece is machined aluminum The
Electronics Forum | Tue May 25 12:05:53 EDT 1999 | Deon Nungaray
| Just a note about cleaning stencils with a mixture of alcohol and water, especially if you're using no clean paste, it's really not recommended. | | Don't take my word for it, you can check with Alpha or most any other solderpaste vendor. What wil
Electronics Forum | Tue Mar 23 23:17:03 EST 1999 | Chris G.
| Are there many of you who are soldering through hole parts in your surface mount reflow oven? How repeatable is the process? Do you need to touch up a lot after reflow? We don't do long runs maybe 200, 300 boards max. Can you just screen print
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