Making a microscope

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Michael A. Terrell
Guest

Sun Mar 13, 2005 7:37 pm

Asplanchna wrote:

Quote:

If you're able to, take an old board with you to the place that sells
the optivisors & see if it works for you ( that's what I did).
Any larger magnification, and the board has to be closer, which makes
it difficult for rework with a soldering iron.
I've seen people using higher mags for rework, but it's a personal
choice.
I have used a very expensive ?x magnification stereo inspection
microscope, but that's just what it's for, inspections...I could never
do any practical rework under something like that, I guess my head
like to bobble around way too much Wink

.
G'luck!

This is where you need the zoom feature. Zoom in to inspect, zoom
out a little to rework, then back in for inspection. I did a lot of
soldering under a stereo microscope with it zoomed out enough to see all
the pins on an 8 pin SMD package. I used Ersin .015" solder and the
corner of .050" tip because the smaller tips didn't hold enough heat for
more than one joint without burning them up. I tested, troubleshot and
reworked boards eight hours a day for over four years this way.

--
?

Michael A. Terrell
Central Florida

Watson A.Name - \"Watt Su
Guest

Sun Mar 27, 2005 3:44 pm

"Russ" <StateStreetAmusements_at_hotmail.com> wrote in message
news:DSKXd.83694$wc.61536_at_trnddc07...

Quote:

It says the #3 is 2.5X mag. Is that strong enough? I thought you
needed at
least 10X plus. They sell stronger lens but only up to 5X. I tried a
5X
desk lens light and it wasn't strong enough. Thanks for the feedback.

One website showed a flip down loupe that makes it 2.5X, so it would
then be 3 x 2.5X or 7.5X.

You can also get a pair of clip-on loupes that fit on eyeglasses. My
dentist has a pair of those loupes that fit on his glasses and are like
telescopes. They not only magnify but 'reach out' to focus a foot or so
away, so you are not holding your hands up under your nose. Trouble is
they're $400 or something like that. They are available at some medical
supply or surgical supply stores. Another advantage is they go wherever
you go. A microscope is pretty much stuck on the bench.

Quote:

"Asplanchna" <tiny_at_rotifer.com> wrote in message
news:roou21p7c7ere56ct90sl0t7d3tcvgpjbd_at_4ax.com...
For working on SMT PCB boards I generally use
an "optivisor" with a #3 lense , ~$40.00-$75.00
you can do a google on them, or call around to your local
electronics
or jewelry supply place.
But if you want really cheap, make 2 of these? Wink

http://www.funsci.com/fun3_en/ucomp1/ucomp1.htm

On Wed, 09 Mar 2005 07:33:29 GMT, "Russ"
StateStreetAmusements_at_hotmail.com> wrote:

After pricing stereo microscopes and not wanting to spend $400+ And
after
buying 5 or 6 little 1x,2x,4,5, magnifying lens I was wondering if
there
was
a way to construct a cheap stereo microscope. It doesn't have to be
stereo.
It just needs to be 10-20x power and about 5 inches of clearance
between
the
lens and the pcb I am looking at. How would you go about putting
this
together? I have a old pair of binoculars if that will help. Any
ideas?
Thanks again

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