In article ,
Jacek Zagaja jzagaja-at-poczta.onet.pl wrote:
Don,

Our Polish lathe is rather old - maybe 25 years now. It needs a little
tuning. You're right it can turn metric and other threads as well but
the minimal pitch is 1.0 mm so for precise mechanics it fails.

Hmm ... is it possible to add extra gearing at the left-hand end
of the headstock, to cause the threads to be 1/2 or 1/4 of the current
ones? I suspect that it is -- but perhaps the gears to do so were
optional, or were lost in some move.

Binoculars eccentric mounting - it sounds interesting. In old binos
you have to unscrew the lens a little to match two objectives.
Otherwise you can get a squint

This, I first found in some old cheap Japanese binoculars (back
before Nikon and Cannon were recognized as high quality optical firms.

Is this to be an astronomical telescope? (For viewing the stars?)

Yes this is a superb an well known Carl Zeiss Jena Telemntor refractor
(objective D=63mm fl=840mm) produced between '88-'90. It has
outstanding built quality.

Aha -- you are repairing an existing telescope. I would love to
see it.

I do purchase some products from your country. An example is lathe
chucks, which are sold here under the name "Bison", though I don't
know what the factory actually calls itself. In any case, I am quite
pleased with the equipment from your country which I have and use
regularly.

Do you have the company www site who sells "Bisons"?

They are sold by several companies, including MSC
(http:/www.mscdirect.com/), and New England Brass and Tool
(http://www.brassandtool.com/). While I buy most things from MSC, for
some things (including the Bison chucks) I use New England Brass and
Tool. I'm sure that there are other vendors who sell the Bison line as
well, but I don't happen to have their URLs handy. I suspect that the
"Bison" name comes from an importer, rather than from the factories in
your country.

Were not the tanks used by the Russians built in your country at one
time (before the breakup of the Soviet Union)?

Yes they were for example casted parts made in Polish stealworks
(Katowice) but where was the assembly hall - no doubt a south of
Poland (Slask).

Far better to make them than to be where they are being used. :-)

Good Luck,
DoN.
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