Electronics Forum: stencil (Page 487 of 540)

PCB bows after wave soldering

Electronics Forum | Fri Jun 18 17:36:10 EDT 2010 | sid

Good afternoon all, I have been trying to find a solution to a defect I just noticed. After stencil printing and smt part placement on the secondary side of my boards, I run them through a wave soldering system. All my components got soldered perfe

BGA non wetting

Electronics Forum | Tue Sep 14 14:07:45 EDT 2010 | grahamcooper22

Hi Gani, HASL is normally very good for solderability providing there is a good consistent coating of HASL on the pcb pad. But it is not unusual to have a very thin coating of HASL on the pad and this is poor for solderability. You then have tin/copp

Best way to ensure max solder load on SOIC w Thermal Pad

Electronics Forum | Tue Nov 09 04:21:11 EST 2010 | bising

Hi SMT World, I am facing a technical challenge related to an SOIC 14lds with thermal pad on it's belly that needs to be soldered onto PCB, together with leads. It is a 50 per board, expected 80% solder load on every one. We have some units without

Using Vapour Phase Soldering Process

Electronics Forum | Mon Dec 20 22:41:42 EST 2010 | grantp

Hi, We had it for a while, but had to take it out and replace it with normal convection. I mean the soldering quality is absolutely amazing, and the joints looked perfect, however it was a horror for tomb-stoning. We tried all types of stencil apert

Solder beading with PCB from different fab

Electronics Forum | Wed Apr 06 04:18:03 EDT 2011 | emmanueldavid

TK, Hope you got it right only for this round of assemblies. Well, passing through a Reflow belt is not an ultimate process to dry circuit cards & take out moisture from Solder finished layers. First of all, if the packs were not unsealed (even s

BGA Reflow

Electronics Forum | Wed Jun 08 13:41:56 EDT 2011 | swag

Two thoughts from me: 1)Are you sure the balls are collapsed? Have you looked at the perimeter from the side with a scope? From your x-ray, it appears you are correct in saying they are collapsed as the balls get smaller in a uniform fashion as you

SMT equipment--cheap/for starter

Electronics Forum | Thu Oct 20 19:35:45 EDT 2011 | eadthem

Your kinda vague on your description, How many components per hour, how many circuits per a day, week, month? what kinds and size of parts.? For a PNP setup for smt boards you will need a stencil printer(possibly manual or full auto like a DEK, 1 o

Underscreen cleaning cycles

Electronics Forum | Fri May 11 14:54:38 EDT 2012 | stentech

I am not aware of the Nano protek flaking off. However I do believe it can wear off through abrasion. Unforunately there is no red light goes off when it has worn unless you have good paste inspection. Even when it wears it will not take you to a neg

Underscreen cleaning cycles

Electronics Forum | Thu May 17 11:39:38 EDT 2012 | stentech

Hi again quickly. Anyone need a sample let me know ..no charge. I would be evry interested in your findings and can give many references for you to talk to..customers. Scott I am working on a project with different cut parameters very time consuming

How to place pin supports the same everytime a board is ran?

Electronics Forum | Tue May 22 10:33:36 EDT 2012 | swag

In my opinion, the best solution is h-towers or similar dedicated tooling designed for each build. However, a quick cheap fix is to make templates to lay in the bottom of the centernest. If you have access to CAD software, you can print out the ger

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