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6" Tinsley Saturn Cassegrain Restore

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#76 Bomber Bob

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Posted 14 May 2015 - 01:27 PM

Painted the 50mm finderscope tube this morning.  It's dry to the touch, but I'll leave it on my rack in the workshop to cure for several days at least.  It had a textured finish already, so I only lightly sanded it.  In the sun, the pattern looks good.  The color is very close to the Lowe's sample card.  The lens cap is textured black, and in good shape.  The focuser is satin black, and needs a light coat to cover the scratches.

 

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  • Finderscope - 50mm Green Paint 3.jpg


#77 Bomber Bob

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Posted 14 May 2015 - 01:40 PM

Many of you have been on CN much longer than me, so I gotta ask:

 

1.  Have you ever seen so many Tinsley scopes on the Classics Forum at the same time?

 

2.  Have you ever seen a 6" Saturn Cassegrain - real life and/or catalog?

 

3.  Who are the CN Tinsley Experts that I can pester?

 

At least once a week, I spend an hour or so searching the Internet for info on this scope.  I think I'd have better luck looking for Atlantis.


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#78 Bomber Bob

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Posted 15 May 2015 - 11:42 AM

Out with the old, and in with the new.  Looks like the weather will cooperate long enough for me to get the primer on the tall pedestal.  The latitude bolt is about 5" shorter than the Edmund, so the scopes will be staggered - that'll give both plenty of space to move in & out and avoid collisions.

 

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  • Pedestal - Old Meade CN1.jpg
  • Pedestal - New Unpainted CN1.jpg

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#79 Bomber Bob

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Posted 15 May 2015 - 03:44 PM

Got the primer on, and it's about to hail -- whew!  I'm rushing to get the mount done so I can concentrate on the OTA...

 

The brass screws for the mirror & focuser assembly were missing.  The hardware isn't a problem.  But the much lighter end ring has reinforcers (not washers) that they screw into.  I could use large washers for the much heavier cell, but since I have scrap aluminum left over from the JaegerMeister, I may use that to make an internal ring with threaded holes.  Do y'all think that's overkill, or would washers suffice?



#80 clamchip

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Posted 15 May 2015 - 04:45 PM

What color are you going to paint the OTA?

 

Robert



#81 Bomber Bob

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Posted 15 May 2015 - 06:45 PM

The pedestal & OTA will be the same as the finder tube.  Indoors, it looks more green than silver/frost, but outdoors it's vice versa.  It goes well with all the brass - but what doesn't?

 

'Secluded Garden' dried faster than expected.  The pedestal is done, and the Meade GEM is back together.  First time I've used Lowe's Valspar spray paint, and I'm very happy with the color and the satin finish.  Both my wife & my daughter thought it made a pretty contrast with the GEM's textured black.  When the rain stops, I'll get a photo in front of my world-famous workshop doors!


Edited by Bomber Bob, 16 May 2015 - 08:49 PM.

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#82 Bomber Bob

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Posted 17 May 2015 - 09:20 AM

All ready to carry a Classic:

 

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  • Pedestal - New Painted CN1.jpg

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#83 macdonjh

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Posted 17 May 2015 - 09:39 AM

Wow.



#84 Terra Nova

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Posted 17 May 2015 - 10:20 AM

Looks Good J.W.

#85 clamchip

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Posted 17 May 2015 - 10:28 AM

Very nice and I love the color.

 

Robert



#86 Bomber Bob

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Posted 17 May 2015 - 11:02 AM

Thanks y'all!  Gonna try to get the OTA finished by the end of June.  Got a lot of catching up to do at work, but I'm motivated to see Saturn!  And I'm ready to remove the (pending) from my signature.

 

My camera exaggerated -- it's not that bright -- but the silver does show in the mix.


Edited by Bomber Bob, 17 May 2015 - 11:04 AM.

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#87 Rich (RLTYS)

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Posted 18 May 2015 - 05:05 AM

Nice looking.  :waytogo:

 

Rich (RLTYS)



#88 Bomber Bob

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Posted 24 May 2015 - 02:08 PM

The 50mm finder is done.  I'll give the new black paint a couple of days to cure before reassembly.  Its slotted eyepiece holder is brass -- nice touch.  I may polish off the paint on the end so a bit of it can show.

 

The original secondary holder is long gone.  I'm making a new one incorporating parts from the unknown mirror set maker to fit the Tinsley spider.

 

Painting between thunderstorms is a blast.  The wind whips around from any & every direction without warning.


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#89 clamchip

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Posted 24 May 2015 - 02:38 PM

Here is Ken Novak's "Cassegrain Notes" if it will help

you with the secondary holder:

http://bobmay.astronomy.net/CassNotes/

Your a lot braver than me, not only am I a clam chip magnet I'm a paint run magnet as well so I'm waiting for warmer weather scheduled in a few days for painting my Tinsley tube.

 

Robert


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#90 Bomber Bob

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Posted 24 May 2015 - 03:00 PM

Shoot!  I'm used to it.  I had the new painted pedestal hanging in my workshop for less than 2 minutes when the bottom fell out, and we got about an inch of rain in an hour.

 

Despite that, I'm happy to report no runs, no drips, no errors.



#91 Bomber Bob

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Posted 24 May 2015 - 09:40 PM

A few hours under a very old tanning lamp, and she's back together again:

 

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  • Finderscope - 50mm Paint Complete 1.jpg

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#92 TexasSky

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Posted 24 May 2015 - 10:25 PM

Whoa! That's awesome bomber!.....I like the extended pier...glad to see the mount is working out for ya....anxious to see the final product.....

bob



#93 Bomber Bob

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Posted 25 May 2015 - 02:01 PM

Cassini got her interior blackened today, after I went over the exterior - sanding & buffing by hand.  I'll do some checking this week while the rain keeps us indoors, and hopefully I'll get the final painting done this coming weekend.  Went through two thin coats of bluish paint to get to what I guess is the original primer - a dull gray.  I'll leave this intact.  There are about half a dozen nicks & scrapes that I want to even out, and a few go down to the metal.  Also need to drill two holes for the 50mm finder.



#94 Bomber Bob

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Posted 01 June 2015 - 05:41 PM

The primer is on, so now I'm waiting for decent painting weather to finish the OTA.

 

I'd like to thank the following CNers for making this project possible:

 

Bob Midiri - for the OTA.  I won't forget the first time I saw his post.

Sean Cunneen - for the mirror set and the pretty brass finderscope & rings.

Bob Albers - for the vintage & mint-condition 1980s Meade GEM, and for his offer of a cool Eiffel Tower metal lattice pedestal!

Brian Dewelles - for the sharp 50mm 1960s spotter (now guidescope) and the sets of period finder rings.

 

My only regret is that I couldn't use Bob's pedestal, but trying to move the rig would've been too tough -- though it would've been a show-stopper!


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#95 Bomber Bob

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Posted 07 June 2015 - 04:51 PM

The Countdown is at 7 days.  Got the tube painted this morning.  Highs this week in the 90s, and it'll be hotter in my workshop - that should cure the green.


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#96 Bomber Bob

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Posted 09 June 2015 - 06:38 PM

Cassini is finie... for once, I beat my own conservative deadline.  Beauty shots and star test to follow - once this rain stops!

 

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  • Cassini - Finished 20150609P02.jpg

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#97 Terra Nova

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Posted 09 June 2015 - 06:41 PM

That is quite lovely! Other shots at other angles would be nice. I love the color! And the brass is very nice!
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#98 Terra Nova

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Posted 09 June 2015 - 06:42 PM

What is the guide scope next to the smaller finder?

#99 Bomber Bob

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Posted 09 June 2015 - 06:48 PM

Thanks Terra!  My phone camera doesn't do her justice at all.  My Man Cave has two vintage lamps, and in their soft light, she glows.

 

NWS says we won't have clear skies for another week at least, but I'm hoping to get her over to the Shakespeare Festival on Sunday, and use my Canon to make some much prettier photos.

 

Before attaching the secondary, I centered the spider through the focuser with a crosshair eyepiece.  Then, I locked the primary, in case I dropped her getting the heavy OTA up on the cradle.

 

I'm going to have to get a 10-15 lb additional counterweight, but with our lousy weather, I have time.  No star tests any time soon...



#100 Bomber Bob

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Posted 09 June 2015 - 06:51 PM

The 50mm guidescope is actually a spotting scope from the early 1960s.  It has a great lens, and is built like a bazooka.  It's Japanese, but I have no idea which company made it.  The rack & pinion is long & smooth - helical cut.  I'll use one of my old diagonals with it, but for the first photos, I left it as delivered.




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