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Vintage ATM Maksutov

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#1 Mr Magoo

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Posted 19 September 2021 - 05:27 PM

An interesting vintage ATM Maksutov came into my possession recently. It was built sometime in the 1960's. The make is still unknown to me, but I am chasing leads the best I can.

 

The front meniscus measures right at 4" of clear aperture. I am not sure if that indicates that the primary would be the same diameter. I have not opened it up to look at the mirror and don't have any plans to at this time. 

 

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#2 Mr Magoo

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Posted 19 September 2021 - 05:30 PM

The scope is held to the mount by means of the leather strap. There are several sets of extra holes in the machined channel that it rides on so I believe it went through several iterations of how it was secured. 

 

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#3 Mr Magoo

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Posted 19 September 2021 - 05:31 PM

The finder has a reticle in it. 

 

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#4 Mr Magoo

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Posted 19 September 2021 - 05:34 PM

Rear view of the control box. The two brass knobs must be for collimation. Lower left knob is a focusing knob that moves the mirror and the knob on the right moves the right angle prism that moves in and out to use the axial port. 

 

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#5 4Texans

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Posted 19 September 2021 - 05:37 PM

That is an impressive ATM project! How well does it perform in use?



#6 Mr Magoo

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Posted 19 September 2021 - 05:40 PM

The draw tube on the focuser is also a helical focuser for fine adjustment. The two nuts on the pinion shaft are actually bushings with non concentric holes. By adjusting them you can increase the tension on the shaft although it is super sensitive and took a lot of trial and error to get adjusted. The draw tube has what looks like a commercially made compression sleeve from a focuser of the time period glued in with possibly silicone. 

 

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#7 Mr Magoo

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Posted 19 September 2021 - 05:43 PM

View inside the control box showing the prism. In this position it is sending light path up through the focuser. 

 

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#8 Mr Magoo

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Posted 19 September 2021 - 05:45 PM

View showing prism moved out of the light path for using the axial port. Second shot shows the prism rotated around so that it is visible.

 

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#9 clamchip

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Posted 19 September 2021 - 05:45 PM

Here's a great article that may shed some light:

https://stellafane.o...illard/mak.html

 

Roberrt


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#10 Mr Magoo

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Posted 19 September 2021 - 05:48 PM

This interesting little bracket is attached to the finder and is made of wood. Not sure what it was used for. 

 

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#11 Mr Magoo

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Posted 19 September 2021 - 05:51 PM

Last one for the OTA. The meniscus lens. The OTA has been flocked inside with a material that looks like Protostar flocking so that must be more recent. Next up is the mount. Lots more pics to come in a minute! Patience Padawans!

 

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#12 Mr Magoo

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Posted 19 September 2021 - 05:54 PM

The mount is crazy heavy for its size and is primarily all brass and aluminum. The RA shaft is stainless. 

 

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#13 Mr Magoo

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Posted 19 September 2021 - 05:55 PM

The setting circles are from Edmund and I'm sure someone here will be able to date them. 

 

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#14 CHASLX200

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Posted 19 September 2021 - 05:57 PM

Maybe a early Q4. I like the mount.


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#15 Mr Magoo

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Posted 19 September 2021 - 05:58 PM

Both the RA and Dec have cork washers for a friction clutch and tension is adjusted with the large brass knurled knobs. 

 

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#16 Mr Magoo

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Posted 19 September 2021 - 06:03 PM

The RA motor is missing. The brass gear is interesting to me in that it is actually two separate sheets cut to make one gear. I can not understand why it is made this way and what is up with the springs. I'm sure one of you will know why it is made this way. I have an old Cramer 1/15 rpm (4 rph) motor from another mount and the mounting hole spacing and distance to the shaft centerline matches exactly with what is on this mounting bracket. The shaft on the motor I have is way too long and I really don't want to cut it down for this so I will be looking for another motor for this mount. The worm block has some extra holes and looks like it may have been repurposed from another mount. 

 

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Edited by Mr Magoo, 19 September 2021 - 06:05 PM.

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#17 Mr Magoo

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Posted 19 September 2021 - 06:10 PM

The pier post cap has a bubble level. There are brackets on the pier cap and one on the RA housing must have been for a latitude adjuster or lock. Whatever went in between them is missing. The pier post is a machined piece of billet aluminum and has a wall thickness of 1/4". 

 

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#18 godelescher

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Posted 19 September 2021 - 06:10 PM

I don't have elucidation for you, but it looks like a very well built, well machined, well executed telescope.

If the views are as good as the looks, hang onto it because you probably won't find another
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#19 Mr Magoo

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Posted 19 September 2021 - 06:13 PM

The counterweight is steel and is bored to 1.5" with a 1" aluminum bushing inserted to fit the stainless steel shaft. 

 

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#20 Mr Magoo

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Posted 19 September 2021 - 06:19 PM

The tripod bracket is cast brass. The leg bracket are made so that they have a positive stop and no spreader is needed. 

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#21 Mr Magoo

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Posted 19 September 2021 - 06:20 PM

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#22 Mr Magoo

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Posted 19 September 2021 - 06:22 PM

The leg tips are interesting to me also. They are also made of cast brass and held on the legs by means of  brass pin. 

 

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#23 Mr Magoo

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Posted 19 September 2021 - 06:24 PM

The scope did come with four eyepieces in the case. 

 

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#24 Mr Magoo

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Posted 19 September 2021 - 06:25 PM

Robro is one I have never seen or heard of. It is an 1.25" eyepiece. 

 

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#25 Mr Magoo

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Posted 19 September 2021 - 06:30 PM

This eyepiece is not 1.25" and I'm pretty sure it was a microscope eyepiece. 

 

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