Electronics Forum | Fri Feb 07 20:41:52 EST 2020 | orbitcoms
I am finding if I have to stop the pick and place machine during production very often (mostly due to feeders not pulling the tape cover back), I get paste drying in the apertures of the stencil. To avoid this I am thinking of pasting all the boards
Electronics Forum | Fri Feb 28 03:59:41 EST 2020 | SMTA-Davandran
My input are: i. To solve tape not pulling back if it is due to high per is better to use more feeders to minimize this issue. ii. To slow down printing speed. Hence, has proper line balancing which minimize board idling before pick and place process
Electronics Forum | Wed Oct 10 20:54:32 EDT 2001 | davef
We're with the Ozzy's earlier posting on this thread. We make similar products, like: * Phantom products that are mostly complete and then are configured to order by adding or subtracting a couple of parts and some jumpers. * Version products like y
Electronics Forum | Wed Oct 10 13:49:12 EDT 2001 | stepheno
I recently started at a new company. They have a variety of bare PCB's and most have aprox. 20 variations. Maybe about 1/3 of each board on average are non-populated locations. They buy one stencil for each PCB but then use scotch tape to block of
Electronics Forum | Mon Oct 15 23:40:43 EDT 2001 | kenbliss
One thing everyone missed is what is the goal of the company. To make money!!! So how many boards per week are you shipping now and how many would you be shipping if you had seperate stencils or a DISPENSER. With quality being number one always the
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 17:28:14 EDT 2001 | Brian W.
Boy, does this sound familiar. I agree with Dave, especially his point about board side taping. The kapton tape has a thickness of approximately 2mils. You artificially increase your paste thickness with this method. It also can be a cause for br
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
Electronics Forum | Wed Oct 10 20:35:17 EDT 2001 | djarvis
Stephen, I don't understand this at all mate. 1. If you don't place a QFP and get bridging across the bare pads, you were gonna get absolutely horrendous bridging if you did put one down. That points to poor printer set up or stencil design or both
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