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New to me(soon) Cave RFT 8" f4.5

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#1 jcricket

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Posted 11 July 2018 - 10:02 PM

Hey Folks,

I found and bought a project Cave Astrola on the bay today. It turns out was about 50 miles from me. I spoke with the seller and he did some measurements for me. I thought it was an f5, but all of the literature I found says they never made an f5, but and f4.5.

 

It is in dire need of love, something I enjoy giving to these old scopes. The seller is actually coming to denver mid next week so he is going to deliver this to me for free. Double cool...............

 

It needs a secondary. I am not sure what size it will take. Probably something like 2.6, maybe 2.14. We'll see

 

A couple of noteworthy things.

The original 8" f4.5 came with an R&P focuser. It was also on a light weight student mount. This particular scope has a helical focuser, and rotating rings. Custom order maybe???

thoughts?

 

more to come........... 

Attached Thumbnails

  • caveRFT4.5.jpg

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#2 The Planetman

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Posted 11 July 2018 - 10:52 PM

That is going to be a great little scope when you get it totally up and running! 
Let us know the vintage when you get it and have time to remove the primary. 



#3 steve t

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Posted 12 July 2018 - 09:13 AM

The focuser looks like it may be a Carle style focuser that Cave sold back in the day. 

Nice looking scope. 


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#4 bremms

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Posted 12 July 2018 - 11:32 AM

Very kewel..  Needs some love for sure.



#5 terraclarke

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Posted 12 July 2018 - 01:03 PM

Nice score! You can fix that up to where it’s a real looker!



#6 semiosteve

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Posted 14 July 2018 - 12:50 PM

Same scope I just picked up complete recently. It also has the helical focuser BTW. Let me know if you need any pics or measurements etc.

 

Very nice scope for cruising the milky way so far.

 

sv



#7 starman876

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Posted 14 July 2018 - 03:05 PM

Nice find. You will enjoy that scope



#8 jcricket

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Posted 19 July 2018 - 05:32 PM

Well, the scope has arrived. I took the primary out and cleaned it. It has one spot of minor damage, about .020 wide and maybe 3/4" long. It looks like a place where the secondary may have made an edge on impact. IT is through the coatings and into the glass slightly. I was once told that if a person "blacks out" the spot it essentially removes the ill affects it would cause. Also, it is time for a re-coat, not horrible, but it could use it. It is in fact an 8" f4.5 from december of 1973.  I did register the mirror on the cave registry. 

 

The mount is doulbe extra way cool. Super solid and fairly smooth. I haven't even pulled it apart or cleaned it yet. I really love the rotating rings. 

 

I need to find a secondary for this monster. It uses a 1.83 size unit. 

 

That is the quick update. I'll post more info and pics in a bit. 

 

till later

mark


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#9 jcricket

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Posted 19 July 2018 - 07:30 PM

Here is a link to some pictures

p81HLSS.jpg

Nn5bILh.jpg

 

xSITW1l.jpg

FQj9xLO.jpg

P1S7ViW.jpg

cfyxwSv.jpg


Edited by jcricket, 19 July 2018 - 07:35 PM.

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#10 Geo31

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Posted 19 July 2018 - 08:41 PM

Sweet scope!  Should make a great resto!

 

Bummer that the RA SC is missing (or do you have it?). 



#11 jcricket

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Posted 19 July 2018 - 09:15 PM

Sweet scope!  Should make a great resto!

 

Bummer that the RA SC is missing (or do you have it?). 

Nope, don't have it. And that is a bummer. That and the missing aluminum end ring on the bottom. Those are both going to be near impossible to find.But we'll see!

mark



#12 Geo31

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Posted 20 July 2018 - 05:58 AM

Is that the 1" shaft mount or the 1 1/2"?



#13 jcricket

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Posted 20 July 2018 - 09:41 AM

It is the 1" shaft

 

I have a jaegers mount with a 1" shaft. I am thinking of moving the counter weights from it over to this mount.

 

As to the missing secondary, I think I have a solution for that as well. This scope had a 1.83 seconday holder. According to mel bartels calculator that is way too small. It should be a 2.6, I have one of those on the shelf for a dob project. I am going to give Astrosystems a call in a bit and look at a holder and spider for the scope. With those and the weights the scope is complete and useable.  



#14 jcricket

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Posted 20 July 2018 - 11:43 AM

I have ordered the secondary from astrosystems. It seems  the 1.83 is correct for this scope. So it is on its way. I should have it by Tuesday. So first light in this scope will likely be next wednesday. I can't wait!!!


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#15 Exnihilo

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Posted 20 July 2018 - 01:47 PM

Nice rotating rings.  Do they work OK?



#16 jcricket

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Posted 20 July 2018 - 05:46 PM

Nice rotating rings.  Do they work OK?

Actually, they work very well. I ordered some VHT Wrinkle plus spray paint from Jegs today. This is a very durable spray paint that is nearly identical to the original in texture and color. The whole scope should look authentic and new when I get it done. 


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#17 tim53

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Posted 20 July 2018 - 05:59 PM

Cave had the best rotating rings at the time, though I'm finding that the Bill Schaefer rings are just possibly a tad better.

 

-tim.



#18 terraclarke

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Posted 21 July 2018 - 06:30 PM

It always amazes me that something once so loved can later become so unloved! :(


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#19 jcricket

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Posted 21 July 2018 - 08:37 PM

Hey Terra,

Your comment made me remember a poem that my grandfather loved. He often used the phrase "touch of the master's hand"

 

What I find amazing is how these old scopes are frequently mis-adjusted and then let go. A few minutes with an individual who knows how to adjust things like collimation, clutch pressure, gear lash etc, and they work as well as when they are new, despite the cosmetic condition.

 

Any way, here is the poem my grandfather loved so much.............

 

THE OLD VIOLIN

 

'Twas battered and scarred,
And the auctioneer thought it
hardly worth his while
To waste his time on the old violin,
but he held it up with a smile.

"What am I bid, good people", he cried,
"Who starts the bidding for me?"
"One dollar, one dollar, Do I hear two?"
"Two dollars, who makes it three?"
"Three dollars once, three dollars twice, going for three,"

But, No,
From the room far back a gray bearded man
Came forward and picked up the bow,
Then wiping the dust from the old violin
And tightening up the strings,
He played a melody, pure and sweet
As sweet as the angel sings.

The music ceased and the auctioneer
With a voice that was quiet and low,
Said "What now am I bid for this old violin?"
As he held it aloft with its' bow.

"One thousand, one thousand, Do I hear two?"
"Two thousand, Who makes it three?"
"Three thousand once, three thousand twice,
Going and gone", said he.

The audience cheered,
But some of them cried,
"We just don't understand."
"What changed its' worth?"
Swift came the reply.
"The Touch of the Masters Hand."

"And many a man with life out of tune
All battered and bruised with hardship
Is auctioned cheap to a thoughtless crowd
Much like that old violin

A mess of pottage, a glass of wine,
A game and he travels on.
He is going once, he is going twice,
He is going and almost gone.

But the Master comes,
And the foolish crowd never can quite understand,
The worth of a soul and the change that is wrought
By the Touch of the Masters' Hand.

- Myra Brooks Welch


Edited by jcricket, 21 July 2018 - 09:10 PM.

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#20 steve t

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Posted 21 July 2018 - 09:13 PM

My late dad liked that poem also

Thanks

Steve T 


Edited by steve t, 21 July 2018 - 09:13 PM.


#21 jcricket

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Posted 21 July 2018 - 09:17 PM

A couple of notable notes...........

 

I found a new parks fiberglass tube complete with aluminum end rings, with no focuser or spider holes drilled. I found it here on CN. It is a perfect replacement for this old tube. smile.gif smile.gif smile.gif

 

I also tested the clock drive. It was way out of adjustment and "popped" because of the mis-alignment. After a few minutes of fiddling, I had it running perfectly!!!! She is slowly coming back to life.


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#22 terraclarke

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Posted 25 July 2018 - 06:41 AM

What a lovely poem. It’s new to me. Thanks for sharing it. :)



#23 Defenderslideguitar

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Posted 29 July 2018 - 06:41 PM

Love that poem as well    and I never heard it before  thanks so much

  Have to have it printed up nicely and at the ready.

 

Reminds me of the great movie    " The Red Violin "


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#24 jcricket

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Posted 01 August 2018 - 01:21 PM

I just packed up and sent the mirror to Swayze optical. He is going to test, possibly refigure it, and send it off to spectrum for new coatings. 

 

Still looking for the RA setting circle. I might even get lucky enough to tear the mount apart this weekend and start the restore..........

 

more to follow

mark


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#25 Geo31

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Posted 01 August 2018 - 04:18 PM

I thought I may have had SCs for you, but they are 1.5" shaft (and bare aluminum).


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