Electronics Forum: stencil (Page 437 of 540)

How to define solder paste printing height tolerance

Electronics Forum | Mon May 07 10:42:09 EDT 2012 | saju86ece

Hi, I need one clarification about solder paste printing height tolerance. How to define and fix the solder paste height tolerance after screen printing for inspection purpose. Currently we are using 5mils thickness of stencil, in that we are gave

63/37 Solder Paste mix

Electronics Forum | Thu May 10 22:16:51 EDT 2012 | davef

It's bad practice to remix used solder paste with new solder paste in the jar. Further, some would argue that it's bad practice to reuse solder paste period. If economics force you to reuse solder paste, store it for reuse in an empty jar. When rea

SMD LEDs stick to nozzle while mounting

Electronics Forum | Wed May 23 18:53:20 EDT 2012 | stentech

Pick and place is not my area but I did have a customer a while ago with a similar problem. He did try different nozzles and air pressure. They use Nano protek on thier stencils. He wiped the nozzles with Nano Protek and the problem dissappeared. Onl

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

Electronics Forum | Mon May 21 16:19:40 EDT 2012 | tbouslog

We are using Ekra Stencil printers and they are great except for 1 problem... We run several different boards a day and we need a way for the operators to place the pin supports in the same postions on the second side of the board everytime a board i

QFN aligment issues

Electronics Forum | Mon Jul 02 14:29:41 EDT 2012 | markhoch

I disagree with the statement that using pads as fiducials shouldn't be a problem. If he's using pads on the PCB, than he is most likely using corresponding apertures on the stencil. During production, these apertures will start to have paste accumul

QFN aligment issues

Electronics Forum | Thu Jul 05 16:41:40 EDT 2012 | stentech

It is very possible We do have lasers designed to cut upto 7feet long. However they are mainly backplanes.I would think this could be your issue although I still think them having the board would help. I am not sure where you are situated. If you wis

Solder Paste Controls

Electronics Forum | Thu Aug 02 09:56:57 EDT 2012 | mccabekev

We currently operate a procedure of keeping fresh tubes of solder paste in a fridge. When it is required we remove the required quantity from the tube and return the tube to the fridge before it warms up to room temperature. We then store this at r

Paste Printing Problems - Toshiba SSM3K15CT(TPL3) FET CST3 package

Electronics Forum | Fri Aug 10 18:06:52 EDT 2012 | mfergus

Anyone have experience printing solder paste for a Toshiba SSM3K15CT(TPL3) FET with CST3 package? Using 1 to 1 rectangular apertures with a 4 mil stencil and Alpha OM 338 #4 powder size lead free solder paste. Print head speed is 15 mm/sec and solven

DEK 265 wrong board alignment

Electronics Forum | Thu Aug 23 10:16:43 EDT 2012 | dontfeedphils

There are a couple of things that I would check. Check the board clamps and make sure that they're in good shape and that they're actually holding the board securely. If those check out I would take a look at the fid camera and make sure that every

Solder balls on pads - lead free

Electronics Forum | Mon Sep 17 03:59:52 EDT 2012 | stivais

Hi guys, We have an interesting case we haven't seen before (see the picture below) http://postimage.org/image/lu2f4ae55/ Solder balls form on unpopulated pads after reflow. 1. Reflow profile is fine. 2. Stencil thickness / paste volume is also f

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