60mm Terrestrial Rebuild/MOD
Posted 03 February 2020 - 09:36 PM
So, this is the only identifying mark on this scope...
Don’t get me wrong, I’m sure someone recognizes this little beast, but all I can do is guess. To me she looks like a S&S from the 60’s, but I can’t be sure. That being said, she’s in deplorable condition.
I pulled her apart because really she was nothing to look at, and will be much sexier when we’re done. But as you can see she’s all there. The optical tube is scratched and gouged a bit, but not dented! The dew shield is very misshapen...
But, with just a few minutes of shaping with my hand and rolling on the table the little shield shaped up quick, not perfect mind you, but definitely better.
The lenses are a separate mater all together...
I mean, this is insane! How does it get like this?
The good news is the cell it’s self actually seems in real good shape.
It appears true, and for all know has never been disassembled since it was assembled decades ago! Once I finally got it apart I got this little group...
There were no metal spacers and no plastic between the lenses, but there was this metal ring!
I’m not sure how common this is, but I was not aware of this as a method for spacing the lenses in a doublet. Is it even technically an “air spaced” set?
In any case, the lenses had rust on the edges and there was obvious coating damage there as well...
After about 20 min worth of cleaning they’re were markedly improved.
that’s where we’re at for now. I need to source a reasonable 60mm focuser, and Chuck is going to assist me with some more info on how to get the tube cut correctly based on the native focus of these lenses and whatever focuser I end up with. So stay tuned, and thanks for playing!!!
Hugs and kisses!!
- GreyDay and Van Do9:3 like this
Posted 03 February 2020 - 09:56 PM
I've got a Taiwanese 90mm with a thin metal ring spacer. Yours might be old enough to predate the clear plastic ones.
Keep in mind focuser length when looking. My 60/7 has a long bodied carton focuser with an integral finder dovetail. It's impossible to balance using a 60mm clamshell on an Eq1 or similar with heavier eyepieces.
Posted 03 February 2020 - 11:01 PM
Posted 25 March 2020 - 06:22 PM
Well I was able to make headway on the little s&s finder project. Got the baffle popped out...
It's a little worse for wear, but we'll get that straight! Was able to get my lens focal length figured out and made a cut on the optical tube...
tested it, and then made another one...
and another one...
AAAnnnnnnddddd, another one...
Finally, that was the proper one. A quick mock up to check for the real deal focus...
and BAM! it even LOOKS like a telescope!
- deepwoods1 and Bomber Bob like this
Posted 25 March 2020 - 06:31 PM
After everything was pulled apart, got my hands on some dead flat and shot the inside of the tube...
and the baffle.
After drying made several calculations and determined the length of my draw tube and cut it.
Checked the function, and then took some epoxy to the teeth on the rack and made a stop...
I also pulled the metal focuser knobs off the terrestrial focuser and slapped 'em on the little focal unit, but I didn't get a pic as such, so ya.
- Bomber Bob likes this
Posted 25 March 2020 - 06:46 PM
After several weeks work, and an absolutely TERRIBLE paint setback that resulted in having to completely sand the optical tube down to bear metal, I ended up with this...
I think it came out pretty good for my first rebuild of a scope. And more importantly, it actually works. Got my hands on some 100mm stock Orion rings, a dovetail for photography, a cheap set of 70mm guide scope rings, and mashed them all together onto the 102mm shorty.
There's those old knobs...
Even the dew shield came out mostly round!
All in all, I like it, it's functional, and really, the only thing that needs replaced is the crappy mount. But that's a story for another time...
- deepwoods1, Terra Nova, Bomber Bob and 6 others like this
Posted 27 March 2020 - 11:03 AM
The little scope performed admirably last night. Functions as a finder as well as could be expected for a 60mm from the late 60’s early 70’s w/dammage to the lens coating. Trying to figure out how to properly construct a functional crosshair has proved difficult.
Thanks to all for coming along and supporting me on my little journey!!!
Posted 27 March 2020 - 03:50 PM
The only thing I question is when you cut the focuser's rack tube, you probably should have added a small screw to re-attach it's front to the new end of the tube, like it was before being cut off. I know it would be hard to find a tap that small, but I've bought some tiny screws and nuts and so a nut could be installed on the inside of the rack tube. That said, I suppose you could glue it.
BTW, that chrome rack tube looks very thick, is it plastic?
Posted 28 March 2020 - 09:07 PM
- Kasmos likes this