On 3 Dec 2004 00:37:40 -0500, (DoN. Nichols)
wrote:

In article ,
Allan Adler wrote:

writes:

The basic Taig is just that, the headstock, bed and carriage.
Everything else is an extra, But it's still possible to have a

[ ... ]



And you wind up with really weird bybrid threads. IIRC (and
I could well be wrong) the standard thread for microscope objectives is
0.800" x 0.5mm (Inch diameter and metric thread pitch).

Don, the standard is .800"-36TPI, 55 degree Whitworth threads, has
been for over 100 years. The same thread is used to hold the turrets
on the tube, or can be replaced with an extender to use single
objectives, and I have seen scopes built that way too. The only
exceptions I know of are Nikon and Olympus, and I've made a whole
bunch of adaptors for these scopes to use the Society standard
objectives. (If anyone can explain where "Society" comes from, it
might be interesting. What society?) Microscope eyepiece diameters
are .913", keeps the confusion away from telescopes where the smaller
standard is .965" for eyepieces. The sizes are not an inch or metric
standard, but were chosen to be completely oddball, meaning there's no
chance that the wrong thing will fit and work. (And again, some Nikon
eyepieces are non standard sizes, more expensive and I don't believe
too well accepted. Their "academics" have the standard eyepieces.)
Camera mount threads tend to be metric, .75mm pitch.

When it comes to stereo scopes, all bets are off, seems like everyone
had their own idea of what would be best and ran with it. My old AO
"Gray Lady" uses .913 eyepieces, my 7X with the 9" working distance
has non removable eyepieces. (I made Jerry a mount to hold another
long working distance 7X over his jewellers lathe, works great, wish
I'd made two of them.)

(Metalworking content: I think I know what I'm going to do today now.
Another overhead mount coming up.)