Electronics Forum: stencil (Page 223 of 541)

Gluing Quality Issue !!!

Electronics Forum | Tue Nov 03 11:46:52 EST 2009 | davef

Search the finee SMTnet Archives for previous posts on the topic. Here's a clip from on of those posts that may get you started. [snip] * Stencil material: metal or plastic, no difference in print, metal is easier to clean, no static problem, availa

super fine pitch paste & dispensing questions

Electronics Forum | Mon Aug 23 10:11:55 EDT 2010 | flipit

Hi, I have never been able to find an acceptable dispense process for dispensing small dots of solder paste. I currently have an auger screw automated dispense system and can not accomplish 0.010" dot sizes. In addition, stencil printing is much m

Voiding in LGA (LT) soldering

Electronics Forum | Mon Aug 30 06:47:18 EDT 2010 | arjan

We having issues installing the Linear Tech LTM8023. We have different soldering results in our PBfree testruns. The voiding and solderball rate is not stable (random positions and sizes). The pcb's (gold finish)are prebaked, the LGA's are stored in

Printing Speeds for Fine Pitch

Electronics Forum | Wed Sep 01 06:38:37 EDT 2010 | grahamcooper22

Dear Leeg, Generally the faster your print speed the more down pressure you need on the blade to roll the paste and wipe the stencil surface clean. Pastes with higher viscosity need more pressure at slow and high print speeds. Too much pressure cause

Stencil Inspection

Electronics Forum | Tue Mar 22 12:27:19 EDT 2011 | swag

At times, yes. We do high volume, fine pitch on flex panels and if we need a 8 mil width aperture, it can't be 9 or 7. It has to be 8 and we have seen times where the tolerance is +/- 1 mil. Additionally, we have received stencils with abnormally

Underscreen cleaning cycles

Electronics Forum | Thu May 17 09:20:10 EDT 2012 | stentech

there are many reasons why FG and Nano are used and many papers written on them. Nano ssems to be the topic of interest right now. I agree it is mostly for printing fine and untra fine pitch. With that comes under stencil wiping to keep the stencil o

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

Electronics Forum | Sun May 27 20:04:10 EDT 2012 | darby

I'm with SWAG. Print a 1:1 transparency of your stencil file and mark it where you want to place the pins. Place it in the product file and use it each time yor run that product. 1. Get the pcb into the print position. 2. Tape your transparency to t

QFN aligment issues

Electronics Forum | Fri Jun 29 10:56:56 EDT 2012 | jorge_quijano

Hi guys, I need your advise on this, I have a very uncommon PCB design (at least for me, I've never seen anything like this...) it is 32" x 18" x 0.062" and has 9 QFNs that are driving me crazy, I'm not able to get a good alignment, I can get a mediu

MPM Accuflex Calibration

Electronics Forum | Sat Jan 12 15:37:33 EST 2013 | mwac

If the machine is printing with an offset on all products, then yes the printer needs to be calibrated with the fixture. That particular model requires the same tools as the 500 and 1500. They were different from other MPM machines of that or prior

Stencil cleaner

Electronics Forum | Mon Jan 21 20:15:50 EST 2013 | jeremymek

It depends really on what you are looking to spend. there are small bench top ultra sonic style cleaners ( eg http://www.gen3systems.com/viewprod-GENSONIC.php) or larger full automatic immersion style cleaners eg http://www.mb-tech.fr/en/our-soluti

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