Electronics Forum: stencil (Page 243 of 540)

Repair Units

Electronics Forum | Thu Jan 26 11:42:58 EST 2012 | davef

Here's what we hear you saying: * Trying to repair a printed circuit board assembly * There's a problem replacing a 57 pin, 20 thou connector * Can't get enough solder paste on the connector leads * Printing paste, replacing the connector, then reflo

Mydata MY500

Electronics Forum | Fri Jun 08 13:08:46 EDT 2012 | andydavis

We have a My500 at out plant. We are high volume and low to medium volume. It is a great machine and is a great solution to some problems that a conventional screen printer cant get around. For example, we have some producets that are not flat on

Stencil aperture positional accuracy

Electronics Forum | Thu Jun 14 13:12:53 EDT 2012 | scottp

I haven't been in a bad enough situation to try it yet, but I had a conversation with Alpha Metals when we started doing 0.4 mm pitch and they mentioned that if we got into a situation like yours we could send them a board and they'd modify the artwo

Stencil aperture positional accuracy

Electronics Forum | Thu Jun 14 21:48:41 EDT 2012 | kmots15

We work with a lot of larger boards over 24", haven't run into this issue yet. I agree with scott could be your board supplier if they are lower quality, from something as simple as unit conversions in CAD to dealing with different temperatures. A

Stencil aperture positional accuracy

Electronics Forum | Fri Jun 15 18:22:49 EDT 2012 | stentech

Our lasers are accurate to +/- approx. 5 microns over 20 "X-Y. I have seen boards 18 x 24 stretch 7mils. I would agree with others, the only way is to send a board to you stencil vendor so they can edit the file to match the board. This is very commo

QFN aligment issues

Electronics Forum | Fri Jun 29 15:57:24 EDT 2012 | stentech

This issue can be common on such large size boards. The newer laser we use today to cut stencils are generally accurate to +/- 5microns X and Y. Probaly way more accurate than your board which will have a +/- into thousands of an inch. Try send a boa

QFN aligment issues

Electronics Forum | Mon Jul 09 19:09:27 EDT 2012 | jorge_quijano

We used to have a manual printer machine, we could never align the stencil over the PCB well, now with the new stencil we have less defects but still appearing on the Top list. I tried to use more fids as you recommend and one issue I faced was that

Solder Paste layer question

Electronics Forum | Sat Dec 08 00:09:24 EST 2012 | jlawson

Mentor(Valor) has dfm softwares that not only looks at the stecnicl layers buy can look at other impacts that could effect the optimisation of the stencil design, ie solder mask layer tolerances defined from fabricator-design etc - this is a upper en

Paste printing fine pitch components

Electronics Forum | Mon Oct 14 10:53:28 EDT 2013 | emeto

0.5 if you use electroformed stencil or > 0.8 if you use laser cut. 2. Always use fresh paste 3. Uses the right printer parameters for your paste(for example Alpha likes fast release of the stencil from the board - in DEK this is called separation s

solder paste height standard

Electronics Forum | Fri Jan 24 08:14:24 EST 2014 | davem

m_imtiaz, Over the last 15 years or so I've found that using the stencil foil thickness +2mils/-0mils has worked very well. For example, if you have a 5mil stencil thickness your upper control limit would be 7mils and your lower control limit would

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