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Cave Astrola Focusers

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#1 clamchip

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Posted 31 August 2014 - 06:07 PM

This is  my pride and joy 1957 Cave model B Deluxe. It is an 8 inch f7 54-3/4" focal length.

I'm trying to find a focuser of the correct vintage and have not had the best luck finding one or if in fact I'm even looking for the correct one for it.

I'll present it here  and see if we can determine what focuser this telescope originally was fitted with..

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  • fifties Cave 012.JPG
  • fifties Cave 014.JPG

Edited by actionhac, 31 August 2014 - 07:15 PM.

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#2 Chuck Hards

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Posted 31 August 2014 - 06:12 PM

Cave sourced focusers from several suppliers over the years.   There are probably a few different ones you could claim as original equipment. 



#3 youngamateur42

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Posted 31 August 2014 - 06:14 PM

Beauty of a scope, more so if restored! Your scope has a Carle on it, it should be correct as many were outfitted with them brand new. That is a very nice focused, hope to get whole of one myself one fy.

#4 clamchip

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Posted 31 August 2014 - 06:18 PM

This is the original location for the focuser and I have marked the original mounting holes with red dots. A Meade focuser is over on the other side of the tube unfortunately with its own holes.

The second picture is what I'm fairly sure the original focuser would look like based on the round mounting flange and mounting screw pattern. I have not seen any other focuser matching this evidence.  

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  • fifties Cave 074.JPG
  • 5048781-Img_5718sm.jpg


#5 clamchip

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Posted 31 August 2014 - 06:27 PM

I found this one I may use, anyone recognize it? I will need to drill 2 holes in the tube if I decide to use it.

The second picture shows the Meade focuser which is the presently used focuser and is a fine focuser but the spider was moved closer to the primary  during this conversion so now the diagonal mirror  is too small. I also would like to undo all of this and make it original if possible.

Also you can see the finder rings were cut off the original mounts and larger ones made and bolted to the original mounts.

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  • fifties Cave 079.JPG
  • fifties Cave 081.JPG


#6 clamchip

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Posted 31 August 2014 - 06:38 PM

I thought about using a Carle Justin, the Carle is a nice helical. I also have another focuser used by Cave, a Rukes, but its mounting flange is radiused for a 12 inch tube and changing it to a 9 inch would be diffucult, also I  think its a later focuser.

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  • Cave 8 015.JPG


#7 clamchip

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Posted 31 August 2014 - 06:47 PM

Here is the Rukes mounting flange. I don't think the Rukes was around in the late 50's, but its close and tempting.

I'm wondering what other round base 3 screw focusers are out there that may be correct or close for this telescope. From what I can find  most of the 50's Caves used a round base 2 screw focuser similar to the Sky Micro only without the helical fine feature but with the distinctive eccentric shaft bushings, at least it appears so in photos.

Attached Thumbnails

  • Cave 8 023.JPG
  • Cave 8 021.JPG

Edited by actionhac, 31 August 2014 - 07:06 PM.


#8 clamchip

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Posted 31 August 2014 - 09:01 PM

Here is another shot of the "unknown candidate" anyone recognize this focuser? obviously its very old, and it's scrumptiously smooth... I may just throw in the towel and use this fine vintage helical.

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  • fifties Cave 083.JPG

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#9 Chuck Hards

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Posted 31 August 2014 - 09:45 PM

Give it a day or two Robert,  someone will know what Cave used on that scope, as well as ID the helical.



#10 turk123

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Posted 31 August 2014 - 10:08 PM

I always thought that the Carle would be correct for the late 50'S

 

Here is a picture from an early catalog from my site.  Is that not your focuser?

 

 

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  • AS 6 richest field f4.jpg

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#11 turk123

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Posted 31 August 2014 - 10:10 PM

After checking a bit, the Carle has a square base.  Clearly I believe the focuser you have would be appropriate for a 1957-59 though.



#12 turk123

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Posted 31 August 2014 - 10:19 PM

Here is my Carle on my 6" Cave RF.    It has only two holes and a lip at the top.

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  • carle-141546.jpg


#13 TOM KIEHL

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Posted 31 August 2014 - 10:25 PM

Here is another shot of the "unknown candidate" anyone recognize this focuser? obviously its very old, and it's scrumptiously smooth... I may just throw in the towel and use this fine vintage helical.

 

 

I have one like that , that came on my ,  Cleveland Astronomic's scope



#14 clamchip

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Posted 01 September 2014 - 12:12 AM

Tom, the RFT the young lady is holding, that focuser looks very close to the unknown candidate.

And so does the Cleveland Astronomics Tom!

wow!



#15 gelkin

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Posted 01 September 2014 - 07:53 AM

Adding to the possibilities, here is the focuser on my 1955 Cave RFT. Very different from the Cave catalog photo. It even has adjusting screws to "align".

DSC_3875.JPG DSC_3887.JPG


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#16 apfever

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Posted 01 September 2014 - 08:42 AM

Leave the tube alone and re drill the focuser flange to match the three holes in the tube.

That focuser appears to have thick enough castings to where you could countersink some tapered screws to match your fancy.

Or use hex bolts to match your fancy. 

 

My 6" has a carle.

The 10" is unbranded 4 bolt square base.

The 8" Telescopics is a Sky Micro Giant round base with 4 mounting holes.



#17 dgreyson

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Posted 01 September 2014 - 09:10 AM

 I went through this same exercise trying to find out what the standard Cave paint scheme was.

 

MY Cave has a 2" sky Giant but it's a 12".

 

Use  the one of your vintage focusers based on which one works best rather than looks best.

I like that idea of counter tapping the base to the existing tube holes.



#18 Jeff B1

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Posted 01 September 2014 - 09:36 AM

Left: Old photo of Cave helical on my 6" f/4 (1975) and new focuser that works great!

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  • Helical.jpg


#19 clamchip

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Posted 01 September 2014 - 10:10 AM

So far it must have been this strange sidewinder focuser. Notice the depth of the cut for the side ways rack gear cut into the tube at 12:00, and its relation to the knob on the focuser.  And the 3 screw holes, and the impression left by the base.

Attached Thumbnails

  • fifties Cave 075.JPG
  • 5048781-Img_5718sm.jpg


#20 PawPaw

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Posted 01 September 2014 - 11:01 AM

So far it must have been this strange sidewinder focuser. Notice the depth of the cut for the side ways rack gear cut into the tube at 12:00, and its relation to the knob on the focuser.  And the 3 screw holes, and the impression left by the base.

I like the looks of that focuser it looks to be the right time period to me.  Beautiful patina on the whole telescope. 



#21 tim53

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Posted 01 September 2014 - 12:27 PM

Must have had a couple bevel gears to run the rack in and out.  Very intersting focuser.  Haven't seen one like that before.

 

-Tim.



#22 tim53

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Posted 01 September 2014 - 12:29 PM

Or, I guess:  A rack facing to the side, like the old single-knob refractors of yore.

 

-Tim.



#23 Chuck Hards

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Posted 01 September 2014 - 12:44 PM

 I went through this same exercise trying to find out what the standard Cave paint scheme was.

 

MY Cave has a 2" sky Giant but it's a 12".

 

Use  the one of your vintage focusers based on which one works best rather than looks best.

I like that idea of counter tapping the base to the existing tube holes.

 

A 50's Cave is too early to have had a Sky-Micro, I believe.  I don't think they were produced until the late 60's, but I'd have to check old S&T ads to be sure.  Not enough time today.

 

My 10" Cave has a JMI Crayford that was installed by the original owner, but I may stick the Sky Micro Giant back on there.  It's a better focuser than the JMI, mechanically, but a bit on the tall side. 


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#24 turk123

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Posted 01 September 2014 - 01:23 PM

The Skymicro patent was filed July 10th, 1959    #3,051,045

 

It may have been on the market by then.

 

http://www.google.co...tents/US3051045

 


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#25 Chuck Hards

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Posted 01 September 2014 - 01:45 PM

57 may still be too early to see it on a Cave, Tom.  Do you know of any precedent?




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