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What did you do to your Scope/Mount Today?

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#7226 norvegicus

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Posted 14 September 2022 - 09:00 PM

The Eikow star tests very well.  It's no 2014 Tak apo but it's very very nice for a $27 60mm f/5.  It went to 94X no problem.   Very happy with that purchase.

 

I did have to take out all the spacers to focus with a diagonal in.  I'll probably put the short one in for camera use.

 

Was hoping to do some wide field targets tonight too but the seeing is really bad so I gave up.  If I'm still awake when Jupiter is visible from my backyard I might try again for that later...


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#7227 ErnH2O

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Posted 15 September 2022 - 11:33 AM

 

I'm missing the counterweights and counterweight shaft.

And the drive motor.

Its pretty rough  but definitely salvageable. 

The tube mounting rings are both broken too. Welding aluminum is

beyond what I'm capable of, I'll hire a pro welder for this job.

In the mean time it is on my Cave mount.

Robert

 

attachicon.gifIMG_0935.jpg

attachicon.gifIMG_0932.jpg

So called Aluma-brazing is relatively easy to do. Use the aluminum rod and a small propane torch. Cast aluminum will oxidize under heat, therefore you must use a stainless steel brush in the molten puddle to get it to bond to the cast. I have a couple pics, in my gallery, of the process. More details on request.

 

20180924 180203


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#7228 Kasmos

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Posted 15 September 2022 - 02:21 PM

 

 

So called Aluma-brazing is relatively easy to do. Use the aluminum rod and a small propane torch. Cast aluminum will oxidize under heat, therefore you must use a stainless steel brush in the molten puddle to get it to bond to the cast. I have a couple pics, in my gallery, of the process. More details on request.

 

Good Job! I would think the hardest part was how to hold the parts together while brazing.

 

Braze3out.jpg

I had some success doing it but it was only a crack.

I had trouble controlling the puddle and it dripping.

I can't remember if I used the brush to control the puddle?


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#7229 ccwemyss

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Posted 15 September 2022 - 03:34 PM

I painted the Voyager OTA in preparation for making it the finder on the Edmund 4". 

 

Voyager - 1.jpeg

 

Used white appliance epoxy. Now it needs to cure for a week or so before I try mounting it. I still need to order the hole plugs from McMaster, and also add crosshairs to a 32mm plossl. 

 

I got the focuser tension on the Edmund 4 sorted out, but still need to collimate the new focuser.

 

It also looks like the objective is out of collimation again. It's a hassle to collimate because, with a 60" focal length, it's not possible to watch the reflections shift in the Cheshire while pushing on the cell (the only adjustment is to loosen the holding screws and shift them around in their holes). 

 

Chip W. 


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#7230 ErnH2O

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Posted 15 September 2022 - 03:50 PM

Good Job! I would think the hardest part was how to hold the parts together while brazing.

 

attachicon.gifBraze3out.jpg

I had some success doing it but it was only a crack.

I had trouble controlling the puddle and it dripping.

I can't remember if I used the brush to control the puddle?

As I recall, I used a complicated combination of several C-clamps and vice-grips. The stainless steel brush removes the oxidation in the puddle long enough for the aluminum to bond to the casting. I also filed a "V" into the cracks, so there is more to bond to and to be able to grind it smooth for prime and paint.


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#7231 icomet

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Posted 16 September 2022 - 04:42 PM

Worked on the ring system today. 

 

Clear Skies. 

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#7232 clamchip

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Posted 16 September 2022 - 07:19 PM

That is a BIG telescope.

What is it, Optical Craftsmen?

 

Robert


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#7233 clamchip

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Posted 16 September 2022 - 07:56 PM

I'm back with the Sears 6345.

I don't particularly like using this optical tube, its very heavy with it's cast iron focuser and primary cell.

I keep getting drawn back to it because of what I can see in the eyepiece, it is really something special.

I did some digging and apparently Astro Optical did what's known as "Micro Polished Optics" if that's

what it is that makes sense to me. 

I can see quality in the way this telescope performs optically and mechanically. A precision focuser and

a superb lens, and extremely well done baffling. Precision everywhere, the whole telescope is a work

of art. I see the same thing in the 7TE-5 and 10TE-5 Astro Optical models.

It's very comfortable on a Cave equatorial, but I will get going on the Sears mounting so I can try out

the whole package.

Robert

 

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#7234 icomet

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Posted 16 September 2022 - 10:05 PM

That is a BIG telescope.

What is it, Optical Craftsmen?

 

Robert

O.C. it is.

 

Clear Skies. 


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#7235 m0bius

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Posted 17 September 2022 - 11:22 AM

...apparently Astro Optical did what's known as "Micro Polished Optics" if that's

[snip]

 

Robert

 

Got a link or reference to share RE? I'm keenly interested to learn more about AO's 'special sauce' or fabrication process. I've noted excellent contrast with my 60/910 and keep pulling it out of the pile regardless of fancier options.

 

Thanks,

Mike


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#7236 clamchip

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Posted 17 September 2022 - 12:35 PM

Got a link or reference to share RE? I'm keenly interested to learn more about AO's 'special sauce' or fabrication process. I've noted excellent contrast with my 60/910 and keep pulling it out of the pile regardless of fancier options.

 

Thanks,

Mike

I've tried finding that passage and I can't find it.

It was someone talking about Astro Optical no image breakdown at extreme magnification and

the "Micro Polish" was mentioned.

It fits what I see.

AO's "special sauce" reminds me of my TeleVue 26mm Plossl smoothside, it's just a hair sharper.

 

Robert


Edited by clamchip, 17 September 2022 - 12:42 PM.

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#7237 icomet

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Posted 17 September 2022 - 02:32 PM

Still working on this O.C.

 

Clear Skies. 

 

 

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#7238 icomet

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Posted 17 September 2022 - 02:36 PM

Don't forget that wwonderful tube that came with this pile.

 

Clear Skies. 

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#7239 clamchip

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Posted 17 September 2022 - 04:07 PM

Here's the mount for the Sears 6345.

There's a lot going on in this mount, It's going to be a fair sized job.

But it will be just a straight forward nut and bolt project, and a very interesting one.

I see no problems with the mount and motions are smooth and tight.

After 50 years though it must be cleaned and lubricated. I would feel better if it was.

Robert

 

IMG_0953.jpg


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#7240 Bob Myler

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Posted 17 September 2022 - 05:08 PM

Beautiful mount.

 

That clamp-on red light fixture behind it

would be the mother of all tray lights...cool.gif


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#7241 clamchip

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Posted 17 September 2022 - 07:14 PM

I attached a red dot todayfrown.gif I know its a bit like putting a moustache on the Mona Lisashocked.gif

Notice how its way out on the tube, this is the key to using a red dot. 

With it way out there the the finder tube disappears and the red dot just becomes one

of the stars only red. You can zip around so fast, I like using a red dot. 

This red dot is a older Orion Easy Finder.

Robert

 

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IMG_0970.jpg


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#7242 ccwemyss

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Posted 17 September 2022 - 09:10 PM

I collimated three of the loaner newtonians with a GSO newt laser collimator that I recently bought. Amazingly, it came well collimated, and was quite easy to use. Get the dot on the center spot by adjusting the secondary, then adjust the primary until the dot disappears into the hole in the diagonal face.

 

The 8" ATM scope is center spotted already, but the two RV6's aren't. I didn't want to pull their mirrors to spot them, so I cut a circular paper mask just a hair smaller than the ID of the tube, and spotted that. It was so close that it slowly settled to the bottom of the tube, staying flat. The other advantage is that you're not looking at the laser reflecting in the mirror, so it is easier to see. Turning the tube face down, it drifted to the front, where I could remove it. Then I did the second step. 

 

The tube from Intake Hoses arrived and fits the Edmund 4" with room to clear the nuts that hold the cell on. It's a bit thick, so I'll sand it down on the outside (it also has some nicks that I'd want to sand out anyway). Some 3/8" firm felt glued to the interior should hold it nicely as a dew shield. With the 2" focuser and the 60mm finder, the OTA is going to be tail-heavy, so the longer dew shield will help a bit with balance. But I'm also starting to work on a sliding weight system that will go on the front part of the tube. 

 

Chip W. 


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#7243 Lemmon714

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Posted 17 September 2022 - 09:28 PM

I reglued the felts on my 831.  After 60 years the adhesive failed.  

 

IMG_6575.jpeg IMG_6576.jpeg IMG_6578.jpeg


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#7244 clamchip

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Posted 18 September 2022 - 02:20 PM

I've been enjoying this guidescope on my Sears 6345.

It has a air-spaced 40mm clear aperture 500mm focal length f/13 coated objective.

The focuser is jewel-like, a miniature of the main scope.

Near's I can tell it's a Astro Optical model R-41, a table top altazimuth with added reticle

for photo guiding.

I just wanted to mention it because it is so bloody sharp, I mean bloody scalpel sharp.

You absolutely would not believe it. I'm thinking of giving it it's own mount and do some

serious observing with it.

I've tasted 40mm and 50mm long focal length astronomy before with a Swift 838

and a Pentax 40mm and it is really interesting. You will see things you don't see in

larger aperture.

Robert

 

IMG_0924.jpg

IMG_0935.jpg


Edited by clamchip, 18 September 2022 - 02:24 PM.

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#7245 sdedalus83

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Posted 18 September 2022 - 02:57 PM

There’s an R-41 up for auction now.

https://buyee.jp/ite...=search_suggest


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#7246 clamchip

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Posted 18 September 2022 - 03:15 PM

Wow that's it all right.

There's going to be a very happy amateur if its anything like mine.

 

Robert 



#7247 icomet

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Posted 18 September 2022 - 05:48 PM

Almost done with this scope. 

 

Clear Skies. 

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  • First assembly.jpg

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#7248 clamchip

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Posted 18 September 2022 - 07:15 PM

I restored my Sears (Astro Optical) flex drive cables.

These are a important part of the kit. You can drive RA to keep your object in the field and make corrections

on Dec at high power with no vibration.

What I did is chuck the cable in my drill and at low speed a wet SOS pad was run the length.

You will notice the spring/cable is wound like a screw thread so the SOS gets down in the groove and cleans

the rust off really well. The SOS pad just runs along like a nut on the thread, you just grip the pad tight in

your fingers.

Robert

 

IMG_0976.jpg

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Edited by clamchip, 18 September 2022 - 07:20 PM.

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#7249 ccwemyss

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Posted 18 September 2022 - 09:30 PM

I drilled out a counterweight from a 7TE5 parts mount that I've cannibalized for several other projects (and from which I've sent parts to others here). It now slides on a 5/8" diameter aluminum rod that I have. I also replaced the missing thumbscrew with an M6 bolt from one of the 100mm mounting rings I got from Orion, plus a 1/4" piece clipped from an 8-32 nylon screw to serve as the non-marring buffer between the bolt and the rod. 

 

Next up is to cut end brackets from some scrap pieces of 3/4" aluminum plate. I'll bore 5/8" holes in each bracket that won't go all the way through, then drill and tap 1/4-20 holes from the bottom, and enlarge the M6 holes in the rings to 1/4". The brackets will then mount on the rings, and go on the front section of the Edmund 4", with the rod and counterweight between, allowing it to be balanced for different eyepieces in the 2" focuser.

 

Chip W. 


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#7250 rob1986

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Posted 18 September 2022 - 11:52 PM

Almost done with this scope. 

 

Clear Skies. 

I wonder if there is enough demand for you to make a living restoring old newts.

 

Your work is nothing short of beautiful


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