Re: Caring for microscopes

On Jun 29, 2:21 pm, jmch...@xxxxxxxxxxxxxxx wrote:
On Jun 29, 2:10 pm, Kevin Cunningham <sms...@xxxxxxxxxxxxxx> wrote:





Sir;

Your cleaning advice is close to dangerous. The critical one is:

Always clean wet, not dry.
(repeat endlessly)

If is crucial to clean wet. Your trying to float the dirt up and
either into the cleaning tissue, not trying to rub it in deeper.
Remember if you clean dry you will scratch either the glass or the
coating material. By the way, coating material is mostly harder than
glass so you want as much coated glass as possible. For a cleaning
solution use any high vapor pressure chemical, however most high vapor
pressure chemicals are rather deadly so I recommend alcohol, heptane
and water based cleaner like Windex or Sparkle. Heptane is safe but
hard to get so mostly alcohol will have to do. Make sure your work
area is well ventilated.

It is not crucial to capture the dirt in the cleaning tissue, if you
can push it to the edge that's good enough, usually. You want the
glass area used by the instrument to be scrupulously clean though.

The cleaning material can be Kim-Wipes of a simple Tissue like
Kleenex. Don't purchase tissues that have lotions on them that protect
your nose, they just won't work. I use Kim-Wipes since they are
readily available but when push comes to shove I've used Kleenex and
Publix brand tissues. You may have to clean the surface off with
either canned air or an ear syringe (!) but both work well to get rid
of dust. Tissues just add a bit more dust to the equation.

Dip the tissue into the water based cleaner then into some alcohol, I
use Menda bottles but they're expensive. Start from the center and
wipe to the edges. Throw the tissue away. Repeat until clean. Wipe
in the same pattern with a dry tissue to remove moisture. If your
only using alcohol, depends what's on the lens, then you probably
won't have to wipe it dry, just shake the tissue about three times or
so and wipe from the center out.

Camera lens cleaners don't work for cameras, my wife used to own half
of a camera repair company, they just get the dirt mad at you. The
green lens cleaner that just about ever one buys is worthless, its a
mixture of vinegar and water essentially.

If your cleaning objectives go to Wal-Mart or a good hardware store
and buy a cheap, small LED flashlight so you can illuminate the area
your cleaning either from the front or back. That helps you visualize
the dirt. Use a reversed eyepiece as a magnifier. If you need a
longer reach to get to the back of an objective use a whole Kim-Wipe
and wrap it around a diamond holders tweezers (a long reach,
relatively soft tough tweezers) with a lot of Kim-Wipe hanging of the
front.

Be gentle but be firm.

Then there's lubricating, disassembly, etc.

I don't want to stop you or discourage you from writing about
microscopes but you might want to consult with your local technical
people. I've been in the craft of microscopes since '78, it is not
the simplest field in the world. They're is a lot to learn, from
cleaning to electronics to physics to mechanical engineering and I
don't know it all, I learn every day.

Thanks,

Kevin Cunningham

Yes, it is always good to learn something new, and I appreciate your
advice. My camera lens cleaning solution is alcohol based and I
assumed they were all like that. It works well and leaves no residue
(and no stink). I was told back when I was a student myself that
Kleenex and any wood-based paper will contain silica particles and are
not suitable for lens cleaning. Kimwipes are widely used in labs
(including mine) but most folks will not have them at home. My eBay
guide already says you should first try to blow off loose dust or
dirt, never use a dry cloth on a lens, and to work from the center
outward, but I could emphasize that better. Students sitting in a
teaching lab and probably many users at home have no access to a
technician, and when teaching optical mineralogy I had to provide some
instruction on safely handling and setting up the instrument, before
launching into the methodology of rock and mineral analysis.
Persuading the chairman and dean to fund visits each semester from a
service technician for cleaning and adjusting was impossible (I
tried), so cleaning, adjusting, setups, and lamp replacement etc.
generally fall to the faculty member teaching the course. It is
certainly not a trivial task and not always self evident either. Only
a professional like you can provide true technical advice and service,
so I will stick to a few simple basics. Thanks from J. G. McHone

(sigh) I should have gone on and on about the number of things you
have to clean off of microscopes, thats the real reason for using the
chemicals I recommended. One type of crud requires one strength and
another crud requires another type. There is no general use cleaner
because dirt is not general. It's quite specific. I use acetone as
well but that can dissolve plastic so you can be in real trouble if
you make a mistake.

Leica messen mechanics use alcohol, heptane and water based cleaner
only, they feel that it works in various
strengths and you can hurt the microscope with too much stuff. Zeiss,
by the way, uses ether and benzine, some were there has to be more
dangerous chemicals!

Since you are a Geologist you probably don't have to sweat mounting
media as much as a pathologist or tech does, that stuff can be a real
pain in the rear. And do emphasize the diamond holding tweezers, I
use mine for hours every day. They're cheap but kinda hard to get,
try a jewelers supply store.

As for taking apart and fixing tools you should recommend both
phillips, pratt-reed and posidrive cross point screw drivers. The set
you mentioned you had would be a good beginning if it has all of the
above. Metric fine point straight bladed screw drives are a must and
your right, Wiha makes some good ones. And of course a set of metric
Allen heads down to 1.5mm at least. My set goes down to 0.9 and I use
it routinely.

And a good DVOM, there are more electrical problems than I care to
think about.

Thanks!

Kevin Cunningham
SMS
.

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