Electronics Forum: oval (Page 3 of 4)

paste release from stencil, and volume calculation

Electronics Forum | Sun Nov 07 10:54:21 EST 1999 | Steve Thomas

We're looking at redesigning our stencils to facilitate better (well, it's pretty much non-existant, so any improvement is a big leap) release from fine pitch apertures. Currently we have perpendicular walled laser cut apertures. We'll be having

Re: paste release from stencil, and volume calculation

Electronics Forum | Tue Nov 09 19:45:48 EST 1999 | Steve Thomas

1 Money IS an object, and my boss will be thrilled. The stencil manufacturer recommended ovals to facilitate better release. Seems likely to be true, but whether or not it's necessary I don't know. We have perpendicular walls on these (6 mil) ste

TO-220 Chip Package - Bridges

Electronics Forum | Fri Jun 07 10:28:23 EDT 2013 | danselness

We use a Wave Solder Plated Through Hole (PTH) assembly process to install a TO-220 Chip Package in the PCB board that we manufacture and have experienced lower yields on a number of boards with this component due to Bridges. The bridges on the TO-22

Re: BGA warpage

Electronics Forum | Thu Jan 14 08:32:22 EST 1999 | Jim Nunns

They are supposed to be production parts. Our volumes are in the hundreds due to rapid change though. Jim Nunns | Just a comment: we've seen PBGAs curl up at the corners, but only on prototype components that came off of a low-volume "prototype"

Jimbos' R.O.E.

Electronics Forum | Tue Feb 19 16:34:15 EST 2002 | djarvis

Dave, Nice one. I was a roadie for Men At Works' tours to the States in '82 & '83. W had a crew t-shirt printed up that had on the front the musical notation for the hook in 'Who Can It Be Now' with the words printed underneath 'Who F.....g Cares'. O

Re: paste release from stencil, and volume calculation

Electronics Forum | Tue Nov 09 17:12:38 EST 1999 | Dave F

Steve: Addressing your points: 1 FINE PITCH APERTURES Electropolishing Laser Cut Stencils: Laser cut should not requiring polishing. Geesh, how much money do you have for stencils? ;-) Oval Shaped Apertures: Pass. What do you expect to gain f

Re: paste release from stencil, and volume calculation

Electronics Forum | Sat Nov 13 14:09:45 EST 1999 | se

First, let me say what I always say: a good chem-etched stencil will print fine pitch. Chem-etch brings trap to the side walls because its a physical by-product of the process. Because they are less expensive you can add electropolish and still save

Connector solder thieves - through hole

Electronics Forum | Wed Feb 12 12:06:58 EST 2003 | dwanzek

I need some input on what good solder thieves dimensions should be. I am limited to solving my bridging problem with solder thieves; all process/wave variables have been adjusted to try to solve this problem. There are several of these connectors on

THT connector solder thieves

Electronics Forum | Wed Feb 12 13:37:22 EST 2003 | dwanzek

I need some input on what good solder thieves dimensions should be. I am limited to solving my bridging problem with solder thieves; all process/wave variables have been adjusted to try to solve this problem. There are several of these connectors on

How do you identify Lead Free Boards from Sn/Pb?

Electronics Forum | Sat Oct 08 00:49:59 EDT 2005 | Mika

We do the following things: 1.) RoHS PCB:s is marked with a code. This is to identify that the PCB:s itself are RoHS compliant. 2.) If it is a true RoHS PCBA; we put a printed label with a green "texture" on the PCBA. 3.) If it is a mixed PB free/PB;


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