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Vintage Reflector OTA - Commercial or Homemade?

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#76 ccwemyss

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Posted 07 April 2021 - 09:35 PM

Hard to read on the far right. Is the last patent year 24?

 

Springfield Mass is just down the road from me. It used to be a big manufacturing center - motorcycles, cars, guns, machine tools, electrics. Now its claims to fame are the basketball hall of fame, the Dr. Seuss museum, and a casino.

 

Chip W. 


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#77 danmdak

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Posted 08 April 2021 - 07:13 PM

Just so cool!!! How come I never run across stuff like this? My money is that it is a commercial instrument.



#78 apfever

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Posted 08 April 2021 - 11:29 PM

Hard to read on the far right. Is the last patent year 24?

 

Springfield Mass is just down the road from me. It used to be a big manufacturing center - motorcycles, cars, guns, machine tools, electrics. Now its claims to fame are the basketball hall of fame, the Dr. Seuss museum, and a casino.

 

Chip W. 

Thanks Chip, I never recognized the patent 'numbers' as being dates. I thought of them as a long line of jumbled long patent numbers so I didn't scrutinize them yet. 

The last two dates on the far right side are 5-27-19 and 11-18-20.  

I'm checking all print on anything I can now.  I found a large box top from Queen Anne Candy Co. that was used as a gasket between to major plates in the drive system. The box top is in very rough condition but there is some print and basic design pattern. It is their Aristocrat Assortment, twenty seven varieties...but not much remaining to identify.

 

I love Dr.Suess. I have a collection. One fish, two fish.



#79 RichA

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Posted 09 April 2021 - 01:42 AM

Here is a vintage telescope OTA that I would estimate was made around 1920 or so. Is this something that was made by a commercial firm or would it be something that was homemade? I rescued this from being sent to the scrap yard. It currently has a mirror just under 10 inches in diameter. I have the secondary holder but the secondary mirror is missing. It appears that the secondary fell out of the holder and  put a small chip in the primary mirror. The current primary mirror is not original to the OTA. Someone removed the original primary cell and replaced it with a cell and mirror that bolts to the back of the end ring in order to increase the size of the primary mirror. The OTA has lots of brass fittings on it. The focuser is designed to be replaced with a plate camera, which came with the OTA, along with a set of brass eyepieces.

Definitely restore it.  Quite the unique item you have there.



#80 apfever

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Posted 10 April 2021 - 06:17 PM

The RA assembly frozen like a sword in stone. The setting circles pressed onto a collar and plate. The plate collar pressed onto another collar. The other collar pressed onto the RA shaft. All stuck.

 

Here is pressing off the setting circle with it's mounting plate under it, which includes the white and silver collar under it.

Next is the stop collar between that and the shaft. This was a problem, it went about 1/3 the distance and froze up to a very disappointing degree. I had two jacks on this as well, only one shown as I was trying everything I could.

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Edited by apfever, 10 April 2021 - 06:19 PM.

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#81 apfever

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Posted 10 April 2021 - 06:28 PM

That primary stop collar wouldn't come off so I tried to press it back on first. I used my truck rack for a cage since the whole mount fit and the rack is very heavy duty.  About 8 tons of jack later, the jack went stiff, the rack went wavy, I was surprised. I even hammered it hard while under pressure. That collar wouldn't go on or off or any direction

 

I disassembled my 20 ton press and modified it outside to get around the mount. The tractor is supporting the pedestal sticking off at an angle.  I didn't want to change jacks since it took a while to get everything tensioned up. I used a 30 ton jack instead.  

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Edited by apfever, 10 April 2021 - 07:19 PM.

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#82 apfever

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Posted 10 April 2021 - 06:55 PM

The shaft moved, my world moved.  About 247 pumps later (seemed like it), the shaft dropped out.  The collar is next to the shaft, the setting circle assembly goes on the collar.  I beat the brass SS off it's plate with the longest 4X4  I could wield. Both inner and outer diameters are a press. I now have a process to get the RA shaft out of the housing but not today.  I have stuff strung out over .....I'd say a 1/2 acre is realistic and I won't say who's.  Nicer pictures later. The setting circle is a beauty with very deep engravings, 9.5" diameter, 1-3/8" wide face, machined down to 5/16" thick inside. The face is machined with a step back for the numbers while the graduations are raised. Hopefully the Setting Circles can be identified. It's not a homey job. 

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#83 apfever

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Posted 10 April 2021 - 09:04 PM

I did a quick clean for hopeful identification. Anybody?

This looks to be more like copper than brass. I have found some other copper, the OTA end ring are turned copper. Copper, brass, or bronze is a fine line and I don't profess to be an expert for definitive identification. I'm open to suggestions that don't damage anything.  The three inner round dots are hole filled in with a soft metal like lead or Babbitt. 

 

The hours go from 0 to 6 on each side. This matches the R.A. shaft having a stop built into the removed collar. The stop keeps the shaft from rotating past horizontal. It is limited close to 180of travel, requiring a meridian flip to be done promptly.  I intent to extend the range for a longer meridian overlap.

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Edited by apfever, 10 April 2021 - 09:10 PM.

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#84 Bomber Bob

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Posted 11 April 2021 - 07:25 AM

I am awe-struck at your restore work!  You have a boatload of patience & perseverance.  Looking at the parts, I think you'll be rewarded by your results.  I'd love to have your location & gear; but honestly, I'd wind up with more than just cuts & bruises.  I know you don't need to hear it, but:  Be Careful.  With each post, you're proving to us that this Old Scope deserves restoration & preservation -- and use.  Can't wait for your first Sky Test post.



#85 starman876

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Posted 11 April 2021 - 07:49 AM

I am impressed with the selection of tools you have. The tractor is very impressive.  You are a determined man I will say that.  I have used a 20 ton press to take things apart and it is an impressive  sound when the parts finally let go.  I would imagine that 30 tons makes even a louder bang.


Edited by starman876, 11 April 2021 - 07:50 AM.

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#86 Senex Bibax

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Posted 15 April 2021 - 08:32 AM

ATM or commercial, that thing was built by an engineer either way.




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