Electronics Forum: stencil (Page 421 of 540)

0201 Machines

Electronics Forum | Thu May 05 14:58:20 EDT 2005 | russ

Looked at it on the web, I believe that it will place those 600 parts in less than 2 hours! And you guys were thinking that it is slow? Ken, not only will it solder those parts with its blazing speed but did you know that you don't even need a sten

SPM AV SCREEN PRINTER PROBLEMS

Electronics Forum | Fri May 27 14:24:18 EDT 2005 | james

We are currently having problems with our SPM AV Screen printer. It is an intermitant problem, sometimes it will make a loud noise as the stencil is going down on top of the board and sometimes it does not meet its destination. Sometimes the machi

Solder Paste Flux %

Electronics Forum | Mon Jun 13 10:28:29 EDT 2005 | andymackie

I've had a lot of experience with solder spatter. It's usually related to moisture (humidity) uptake by the paste, or outgassing from plating: particularly Au/Ni. Solder spatter from the plating will change from board-vendor to board-vendor. I shoul

Stencil thickness

Electronics Forum | Thu Jun 16 18:19:05 EDT 2005 | Jason Fullerton

If the uBGA has aperatures that are 0.25mm square, you need to use a laser cut foil no thicker than 3.75 mils to get an area ratio of 0.67, which is the minimum rule of thumb - that's too thin! Electroform would probably work up to 4.5 mils thick.

fine pitch QFP

Electronics Forum | Thu Jun 16 22:14:51 EDT 2005 | davef

16 thou pitch parts: Use a 5 thou laser cut electropolished stencil with 0.008"x0.045" apertures and type 3 solder paste. Bridges Connecting or Partially Connecting Adjacent Leads or Lands * Excessive solder paste * Excessive component placement pre

Lead Free Choices

Electronics Forum | Tue Jul 12 20:19:22 EDT 2005 | Tom

Don't mind Sam Adam's and Asahi beer... I'll send you a tantelising pint of Guinness, cool and with a fresh creamy head if you can help me with the following.... What do I do about lead free stencil design? Is there a guideline anywhere? Most lead fr

Lead Free Stencil Design

Electronics Forum | Wed Jul 13 15:26:32 EDT 2005 | russ

The problems we saw had to due with the Flux I believe. We saw what I would call poor coelescence and the residues were very hard for us to clean with our Water only cleaner. I will not lie and say I worked on the process very much. Since we alrea

Solder Paste Storage

Electronics Forum | Sun Jul 17 23:45:04 EDT 2005 | adlsmt

Without knowing how much you use or what you use it for or what brand and which type, hard to say. In general, follow the Manufacturers recomendations. If you are doing precision work then use cartridges and let them warm up to room temp for a few ho

Stencil Cleaning / Zestron / Vigon

Electronics Forum | Thu Aug 25 13:06:45 EDT 2005 | carln

I evaluated a couple of the Vigon products by Zestron last year and I think the SC200 was one of them. They seemed to clean OK, and Zestron said they were biodegradable, but they conveniently failed to disclose that they contained VOCs. If you are

Hirose Connector Installation........

Electronics Forum | Wed Aug 24 22:53:34 EDT 2005 | mrduckmann2000

We have a customer that is using the new Hirose connector p/n df30fc-40dp-0.4v. The connector has lead spacing of .4mm. I beleive that if I have a stencil cut to 2-3 mil I should have enough solder paste to solder the connector to the PCB pads. Ho


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