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Cave Astrola 12.5" Model D

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89 replies to this topic

#1 RDFox

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Posted 05 March 2020 - 07:20 AM

Starting to restore a Cave Astrola 12.5". Any advice is greatly appreciated.

 

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#2 RDFox

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Posted 05 March 2020 - 07:22 AM

More Photos

Decided to replace both bearings, ordered them (hopefully they will fit). I'm restoring the OTA last, this way I'll be in the right frame of mind when I start on it. (In the restoring mood).

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Edited by RDFox, 05 March 2020 - 07:25 AM.

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#3 Frank Otsuka

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Posted 05 March 2020 - 07:54 AM

Here is a rather lengthy post from nearly a decade ago. It is from Tucson.

 

https://www.cloudyni...-12-f6-i-think/


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#4 Frank Otsuka

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Posted 05 March 2020 - 07:56 AM

I forgot to add a note. This builder replaced the tube with a beautiful aluminium one, but alas it is too heavy.


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#5 Defenderslideguitar

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Posted 05 March 2020 - 09:39 AM

This will be quite the scope when all is said and done it should be beautiful as well...…. If you have a good place to keep it where it can roll out at the ready    if will be super.   Good luck and keep the thread going as you make progress....



#6 ccwemyss

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Posted 05 March 2020 - 10:36 AM

Ah, nothing like the days of mounts with Worm gears and spur gears that could double as steering wheels. This should be a great scope when it's done. 

 

Chip W. 



#7 icomet

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Posted 05 March 2020 - 10:41 AM

Here's one little suggestion that might help out in the long run with the 

opperation of your Cave scope when finished. Quick adjustment knobs on the clutch.

 

Clear Skies.

Jeffrey

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#8 Terra Nova

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Posted 05 March 2020 - 11:11 AM

I love to see those big ole’ Caves of yesterday being brought out of the Mothball Fleet and ushered back into service! Well done, keep us posted on your progress! waytogo.gif waytogo.gif


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#9 CHASLX200

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Posted 05 March 2020 - 07:00 PM

Prep work is king when painting these mounts to get the paint to stick.



#10 RDFox

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Posted 05 March 2020 - 08:26 PM

Does anybody know what the off-white paint color is called for the OTA?



#11 CHASLX200

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Posted 06 March 2020 - 06:29 AM

If it is a Parks tube they were not painted. They always seem to yellow with age.


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#12 Frank Otsuka

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Posted 09 March 2020 - 01:25 PM

Getting paint to stick to aluminium is a challenge, but you may have local expertise. If you have a local Ford dealership, ask the parts department (latest trucks are aluminium). If there is a boat yard or airport or RV business nearby, ask their repair/restore folks. 

For the tube, if it is fiberglass, you might use fine sandpaper, say 500-ish thru 2000 grit. Follow up with WHITE automobile polishing compound.  The pink stuff WILL stain the surface.

I see reflections of overhead lights on the tube, so maybe just try auto polish.

Cheers,

Frank


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#13 G-Tower

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Posted 09 March 2020 - 04:05 PM

Does anybody know what the off-white paint color is called for the OTA?

Cave blanco



#14 RDFox

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Posted 09 March 2020 - 06:54 PM

Thanks Frank, I will try the polishing route first. I‘Ve used Acrylic Lacquer on several several car restorations so this would be right up my alley. Sometimes another view is what I need.


Edited by RDFox, 10 March 2020 - 08:07 AM.


#15 RDFox

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Posted 09 March 2020 - 10:15 PM

It’s always a good idea whenever possible to chase the threads before extracting the adjusting screws. This prevents the corrosion and built-up paint from damaging the soft aluminum rings.

 

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#16 andy2175m4

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Posted 09 March 2020 - 10:37 PM

Here's one little suggestion that might help out in the long run with the 

opperation of your Cave scope when finished. Quick adjustment knobs on the clutch.

 

Clear Skies.

Jeffrey

I bought a derelict  8" cave on saturday and disassembled it sunday and discovered the RA and dec axes were rusted and clock motor was toast,  upon disassembling the RA motor,  I was a little perplexed by the gearing,  so if the RA motor is working normally, do I just turn off the motor and manually position the RA to where I want it to start?  so there is there actually a clutch in there ?   Just checking,


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#17 RDFox

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Posted 10 March 2020 - 06:13 AM

I'm not really sure,(yet). Let me dig into it and I'll let you know. One would think that there has to be a provision for that, but I'll look when I get home from work.

 

Refer to the picture that "icomet" posted of his clutch. If it looks like that, you should take the disc off and make sure that the ring gear is somewhat free as so it can slip as you adjust it manually. Tighten or loosen these to where there's a happy medium where the scope will track and you can manually adjust it.

 

(I Think) !   Be Careful.


Edited by RDFox, 10 March 2020 - 08:06 AM.

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#18 RDFox

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Posted 11 March 2020 - 10:04 AM

Hey, I'm also working on reproducing the labels for this restoration. I'll keep updating as I progress.

 

Cave Label.jpg


Edited by RDFox, 11 March 2020 - 10:13 AM.


#19 macdonjh

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Posted 11 March 2020 - 01:50 PM

Getting paint to stick to aluminium is a challenge, but you may have local expertise. If you have a local Ford dealership, ask the parts department (latest trucks are aluminium). If there is a boat yard or airport or RV business nearby, ask their repair/restore folks. 

For the tube, if it is fiberglass, you might use fine sandpaper, say 500-ish thru 2000 grit. Follow up with WHITE automobile polishing compound.  The pink stuff WILL stain the surface.

I see reflections of overhead lights on the tube, so maybe just try auto polish.

Cheers,

Frank

Self-etching metal primer.  I like Sherwin Williams.  This may not be that big a deal since it looks like you have access to a bead blaster.

 

Hey, I'm also working on reproducing the labels for this restoration. I'll keep updating as I progress.

 

attachicon.gifCave Label.jpg

Just in case, perhaps use some lighter fluid or other adhesive remover to dissolve the remaining glue and save the original labels.  If you don't like your reproductions you could then affix the originals.

 

For the OTA, if it is a Parks fiberglass tube, the yellow might go away with polishing or light sanding.  Then you could put a new gel-coat on.  A PM to Chuck Hards might produce some good advice.

 

Good luck with your restoration.


Edited by macdonjh, 11 March 2020 - 01:59 PM.


#20 photiost

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Posted 12 March 2020 - 08:58 AM

nice project !!



#21 RDFox

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Posted 13 March 2020 - 09:07 AM

Found the right bearings, Ahhhh!

 

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#22 RDFox

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Posted 13 March 2020 - 09:09 AM

Fits like s glove

 

 

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#23 RDFox

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Posted 13 March 2020 - 09:31 AM

More parts finished

 

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#24 RDFox

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Posted 13 March 2020 - 09:32 AM

And more

 

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#25 macdonjh

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Posted 13 March 2020 - 10:25 AM

Better than new.  I think your paint work will look really slick when it's finished and all assembled.  If only I had the space for a big Cave or Parks scope...  I like the look of the old equatorially mounted Newtonians and the classic black/ gray/ white colors.


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