Electronics Forum: stencil (Page 102 of 540)

Re: Elimination of Silk Screen

Electronics Forum | Wed Oct 13 23:57:55 EDT 1999 | se

As a stencil vendor to some assembly houses and small in-house assembly shops, both without CAD people rushing to put the paste layers (if they even generate one) into stencil friendly format, the silk screen is the only communication tool we have to

Re: Aperture Reduction for QFP (fine pitch)

Electronics Forum | Tue Sep 21 04:00:27 EDT 1999 | Wolfgang Busko

My stencil thickness is 6 mil and we got qfp's with fine pitch. how many percent should i reduce my stencil aperture using a 6 mil stencil for 0.5 mm pitch and 0.4 mm pitch ? thanks We use 6 mil lasercut stencils with 15% reduction and th

Semi-Automatic Stencil Printing of Fine Pitch

Electronics Forum | Thu Jul 15 08:34:54 EDT 1999 | Mark Quealy

I use a Transition Automation Semi- Automatic stencil printer with laser cut frameless stencils. My solder paste is an SN63/PB37 RMA 291. I do not operate with in a controlled humidity enviroment. The room temp generally runs around 70 deg's but humi

Re: Frameless stencils

Electronics Forum | Tue Jun 01 15:32:59 EDT 1999 | Mike Murphy

We are looking into frameless stencil systems for screen printing. Outside frame size of 29x29. Pros: smaller storage requirements and cheaper stencils. Cons: sharp metal edges, additional change over time required Can anyone relay

Re: Frameless stencils

Electronics Forum | Wed Jun 02 06:58:40 EDT 1999 | Earl Moon

We are looking into frameless stencil systems for screen printing. Outside frame size of 29x29. Pros: smaller storage requirements and cheaper stencils. Cons: sharp metal edges, additional change over time required Can

Re: Cleaning Stencils

Electronics Forum | Tue May 25 11:00:38 EDT 1999 | Deon Nungaray

Is it possible to define a fequency for cleaning stencils on Stencil cleaner machines ? I hate when that happens� you read a question, submit an answer, then re-read the question and realize that you may have misunderstood the questio

Re: Stencils Universal?

Electronics Forum | Mon Mar 15 15:47:51 EST 1999 | Steve Schrader

Are stencils universal from one printer to another? We are looking into the possibility of going from Solderprint 1414 manual printer to a more automated printer. We are also considering bringing some boards we currently outsource in house. I w

Re: Print Height Variation

Electronics Forum | Fri Feb 12 19:02:21 EST 1999 | Jon Medernach

As the squeegee shears the paste at the face of the stencil the vehicle used to contain the solder spheres compresses and expands out the top of the opening after the squeegee passes. This is 1 or 2 mil at most. The peaks should not be considered

Re: Cleaning Stencils

Electronics Forum | Thu Nov 12 11:02:43 EST 1998 | Dave F

First, appologies to y'll for creating an opening for bs@ss to post the usual thinly cloked commercial message. Second, how do you test, measure, determine if your stencil is clean? Thanks Dave F Here I go stepp

Re: Cleaning Stencils

Electronics Forum | Thu Nov 12 12:13:21 EST 1998 | Bill Schreiber

No appologies necessary, it looks like wayne@att beat me to it! Seriously, there is an article in the current November issue of Circuits Assembly magazine: "Surface-Mount Stencil Cleaning" by Nick J. Lester. From talking to Mr. Lester, I know he ha


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