Electronics Forum | Thu May 01 09:19:59 EDT 2003 | davef
ehess Why do YOU want to block apertures to keep solder from pads?
Electronics Forum | Wed Apr 30 21:18:55 EDT 2003 | davef
Morris Why do want to do this [keep solder from pads]?
Electronics Forum | Thu May 01 07:17:35 EDT 2003 | davef
Why not fill the apertures with paste and let the paste dry-out? We have found that a hammer and chisel are very effective for removing dried paste.
Electronics Forum | Mon Apr 28 09:53:10 EDT 2003 | kmorris
I've got a set of apertures on a stencil that I would like to "plug" or block off. In the past we've done this with Kapton tape, but since this location is close to a fine pitch component, the thickness of the tape prevents good gasketing at the fin
Electronics Forum | Thu May 01 15:08:52 EDT 2003 | k_h
If Kapton tape doesn't work, I would recommend eating a few hundred bucks and ordering a new stencil. I think your asking for more trouble trying to plug the apertures with dried paste, glue, or anything else. It will dislodge sooner or later and pro
Electronics Forum | Thu May 01 09:02:55 EDT 2003 | ehess
we have used board mask that we let dry. It's tricky to get it flat with no spikes, but after a few tries you'll get it. I like the guys recommendation to try paste and let it dry. we have that problem when the operators do not clean the stencil p
Electronics Forum | Thu May 01 13:56:45 EDT 2003 | kmorris
Dave: After the stencil was made with apertures for a connector on this PCB, it was discovered that the connector would have to be handsoldered after SMT reflow. If the solder deposits are left to reflow on the pads, it makes it difficult for the o
Electronics Forum | Wed Oct 10 19:04:32 EDT 2001 | mparker
What the heck are you doing having scotch tape in the plant? Isn't there a concern for ESD safety? Ban the scotch tape, then they won't have something to block the apertures with.
Electronics Forum | Wed Oct 10 19:02:38 EDT 2001 | mparker
Why not quantify the amount of time spent taping apertures every time you want to use the stencil vs. the cost of a new stencil (about $300, usually)? Look for problems that are created by the blocked aperture method - is there rework down the line t
Electronics Forum | Mon Oct 15 17:49:16 EDT 2001 | Leland W.
Something you'll want to consider is what happens with bits of tape that become relocated due to manual or automatic wiping. I've seen them block fine pitch apertures and create an insufficient solder condition that, guess what, wound up in the hand