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60mm Terrestrial Rebuild/MOD

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9 replies to this topic

#1 imgumby001

imgumby001

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Posted 03 February 2020 - 09:36 PM

Picked up an old terrestrial beater on the EBay recently and was thinking I would clean it up and use it as a spotter. However, I started thinking it would be cool to mod the zoom focuser to be an Astro. After reading a bunch of threads about how that is NOT a real good idea it occurred to me that I might be able to just replace it and BAM, have a useable 60mm f/7ish scope that would accept 1.25” eyepieces. Being that it’s never that simple, and I’m not that innovative of an idea guy, I figured if I looked hard enough someone has had to have done one already. Sure enough. A quick google and several CN posts popped up with various aspects of this very thing. As many of you have probably seen the all knowing, all seeing, Chuck Hards did an amazing refit of a 60mm vintage terrestrial using custom made parts that was friggin amazing!!! This build is not going to be that cool. But, as he has graciously blessed me with some of his wisdom on This matter, I am going to do a build using bargain basement equipment that will hopefully come out great, and maybe inspire someone to pull out some of the old basket cases and bring them back to life!

So, this is the only identifying mark on this scope...

https://i.imgur.com/YNgrdP4.jpg

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.

https://i.imgur.com/5tGiytK.jpg

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...

https://i.imgur.com/wwr1dQT.jpg
https://i.imgur.com/wINOCBe.jpg

https://i.imgur.com/GOVLQJ4.jpg
https://i.imgur.com/sVPVFYu.jpg

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...

https://i.imgur.com/FcKmhD1.jpg

I mean, this is insane! How does it get like this?

https://i.imgur.com/Co7tJKX.jpg
https://i.imgur.com/ZCVOGCF.jpg

The good news is the cell it’s self actually seems in real good shape.

https://i.imgur.com/qH9Mm9B.jpg

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...

https://i.imgur.com/dIWSd3N.jpg

There were no metal spacers and no plastic between the lenses, but there was this metal ring!

https://i.imgur.com/qOvYFhN.jpg
https://i.imgur.com/cjtQ3Gw.jpg

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...

https://i.imgur.com/N2crT8C.jpg
https://i.imgur.com/KnPNyCH.jpg
https://i.imgur.com/PU4jFHa.jpg
https://i.imgur.com/1Kih015.jpg

After about 20 min worth of cleaning they’re were markedly improved.

https://i.imgur.com/iSsRTaq.jpg
https://i.imgur.com/nsEmIQk.jpg

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!!
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#2 sdedalus83

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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. 



#3 imgumby001

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Posted 03 February 2020 - 11:01 PM

That’s great advice bub! Yes, apparently this old girl is pretty old school with that ring. It’s quite rusted, and I’m wondering if it’s even possible to clean it up enough to be worth putting back in there. Plastic may have been the better option as time went on due to this very fact!!!

#4 imgumby001

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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...

k903xV5.jpg

 

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...

wJWwjd1.jpg

 

tested it, and then made another one...

fx5UATY.jpg

 

and another one...

9TcH6aC.jpg

 

AAAnnnnnnddddd, another one...

mkRpcwM.jpg

 

Finally, that was the proper one. A quick mock up to check for the real deal focus...

FnzQHni.jpg

 

and BAM! it even LOOKS like a telescope!


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#5 imgumby001

imgumby001

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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...

8fFVkNO.jpg

 

and the baffle.

JG8EDXy.jpg

 

After drying made several calculations and determined the length of my draw tube and cut it.

iVOzZ2m.jpg

 

Checked the function, and then took some epoxy to the teeth on the rack and made a stop...

GNMX9OB.jpg

 

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. 


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#6 imgumby001

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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...

 

AFZVIiP.jpg

 

TAAADAAAAA!!!!!

 

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.

 

xtsgPs1.jpg

 

There's those old knobs...

 

kEOCwQB.jpg

 

Even the dew shield came out mostly round!

KuiyqM5.jpg

 

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...


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#7 imgumby001

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Posted 27 March 2020 - 11:03 AM

Quick update:

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!!!

#8 Bomber Bob

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Posted 27 March 2020 - 12:40 PM

Great rebuild / re-purpose!  Thanks for sharing!



#9 Kasmos

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Posted 27 March 2020 - 03:50 PM

Good job!

 

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?



#10 imgumby001

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Posted 28 March 2020 - 09:07 PM

Ya, it’s plastic, and the rack is fully glued anyway. These are low dollar investments as far as scopes go, especially refractors. I’m lucky to have been able to find them for the prices I did. They work ok for my purposes. Both FOC users are basically junk though. Ok for visual, but attach anything to them and it’s over.
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