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From: "Da Man"
References: <email@example.com> <firstname.lastname@example.org> <3E100CF4.1AB@sneakemail.com>
Subject: Re: Total lack of response re SMT query - What gives ?
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Date: Tue, 31 Dec 2002 23:51:39 GMT
NNTP-Posting-Date: Tue, 31 Dec 2002 19:51:39 AST
"Mike Monett" wrote in message
> Nico Coesel wrote:
> > Serious now. Even those small components can be soldered with a small
> > soldering iron. Maybe you need a special pair of glasses for fine work
> > (consult an optometrist) and a good lamp. A stereo microscope is handy
> > for inspection work, but the size of the image is probably far too
> > small to assemble a PCB.
> > Reply to nico@nctdevpuntnl (punt=.)
> A low power 7X to 30X stereo zoom with bright illumination is invaluable
> for checking the quality of solder joints. The problem is the stage is
> too small.
> I bolted a 1/8" piece of aluminum 13" X 20" to the stage, with threaded
> standoffs to support the edges. The top is covered with a thin sheet of
> material used for kitchen countertops, and horizontal and vertical
> crosshairs are scratched into the material intersecting at the focus. I
> can place a rather large pcb on the stage and use the crosshairs to align
> the part I'm working on with the microscope focus area.
> Illumination is provided with two miniature 40 watt stage bulbs
> controlled with an ordinary light dimmer. A small aluminum shield is
> provided to keep my wrists from touching the bulbs while adjusting the
> microscope. I'd like to use small flourescent bulbs to reduce the heat,
> but it's difficult to adjust the light level. Another alternative might
> be to find illuminators using fiber optic light pipes, but watch out for
> the lamp replacement cost.
Try a ring made of white LED's?
> Over the years, the glue holding the lens dried out and the lens fell
> out. I was afraid of taking the microscope apart due to possible damage,
> but found the process quite simple. A small dab of automotive high
> temperature silicon rubber with low outgassing for oxygen sensors solved
> the problem.
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