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Equipment Discussions >> Classic Telescopes

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turk123
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Reged: 07/09/10

Loc: N.E. Ohio
Re: Elli Buk Cave 10" Cassegrain [Re: turk123]
      #5856188 - 05/12/13 07:39 PM Attachment (12 downloads)

Well the large finder tube was not only dirty, but also had a lot of nicks and scratches but mostly just in the paint. I learned when I redid my 7TE-5's tube that if you think that a scratch in the paint will fill with paint, your wrong. So I sanded everything down as far as the aluminum if it had a scratch and feathered it out for the paint. There are a few deeper nicks that I will fill with JB Weld and sand out. I also found out that JB Weld is stronger than the aluminum. Should I just use a sanding primer like the etching primer I used on the other components to fill the nicks? Will it fill the nicks (very shallow)?

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gelkin
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Reged: 09/22/10

Loc: Western, MD.
Re: Elli Buk Cave 10" Cassegrain [Re: turk123]
      #5856211 - 05/12/13 07:50 PM

I like using glazing putty for minor imperfections. Its available at auto parts stores. No mixing, sands nicely and may even require a couple applications to fill in good enough.

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DAVIDG
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Reged: 12/02/04

Loc: Hockessin, De
Re: Elli Buk Cave 10" Cassegrain [Re: turk123]
      #5856232 - 05/12/13 08:02 PM Attachment (15 downloads)

Many of the Cave 50mm finders I've seen have issues with the cement betweem the lens elements going bad but I wouldn't let that scare you away from buying one. It's easy to separate the elements and redo the cement. Here is one I did on the Cave I'm restoring. Instead of cementing the elements I oiled them. I hope you find an original replacement for your scope.

- Dave


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DAVIDG
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Reged: 12/02/04

Loc: Hockessin, De
Re: Elli Buk Cave 10" Cassegrain [Re: DAVIDG]
      #5856251 - 05/12/13 08:14 PM

Tom,
I worked in body shop when I was in high school. I would use sandable or filler primer and apply two coats then wet sand with 400 grit paper. Any low spots will show as darker in color. Then use glazing putty to fill in any remaining scratches and wet sand again. Bondo makes glazing putty. It comes in a tube and dryes quickly so it you can sand it and paint over it within about 15 minutes of it being applied. Prime a third time. Lightly scuff the primer and able the color. Let the color dry for a couple of days and wet sand the surface with 1000 grit paper. Then buff with rubbing compound and it will come up like a mirror.

- Dave


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tim53
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Reged: 12/17/04

Loc: Highland Park, CA
Re: Elli Buk Cave 10" Cassegrain [Re: DAVIDG]
      #5856346 - 05/12/13 09:08 PM

Glazing putty is great if you only fill small nicks and scratches with it.

It's basically a very thick lacquer paint, so it dries fast but is brittle (why you don't want to fill dents with it).

-Tim.


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turk123
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Reged: 07/09/10

Loc: N.E. Ohio
Re: Elli Buk Cave 10" Cassegrain [Re: tim53]
      #5856382 - 05/12/13 09:29 PM Attachment (15 downloads)

The counter weights on this baby are heavy. The largest here, is 35 lbs. Stripped with my favorite remover

Paint came off very easy. Must have gone to rust as the finish is showing. Probably why it was re-painted (shown in second picture.)..


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turk123
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Reged: 07/09/10

Loc: N.E. Ohio
Re: Elli Buk Cave 10" Cassegrain [Re: turk123]
      #5856383 - 05/12/13 09:30 PM Attachment (15 downloads)

Finished removing paint.

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turk123
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Reged: 07/09/10

Loc: N.E. Ohio
Re: Elli Buk Cave 10" Cassegrain [Re: turk123]
      #5856389 - 05/12/13 09:35 PM

The self etching primer says it's able to be sanded early after spraying, but it says not to apply it over a filler or bondo type sanding filler. Guess I don't want to use the self-etching primer even though it is over aluminum, what it is supposed to be used for. Am I making this too hard?

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turk123
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Reged: 07/09/10

Loc: N.E. Ohio
Re: Elli Buk Cave 10" Cassegrain [Re: turk123]
      #5858594 - 05/13/13 09:14 PM Attachment (14 downloads)

The weight ended up pretty clean after using the rust remover. I am look to maybe running it on a lathe to get the finish I want. Chrome would be expensive and 6 weeks out here.

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turk123
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Reged: 07/09/10

Loc: N.E. Ohio
Re: Elli Buk Cave 10" Cassegrain [Re: turk123]
      #5858600 - 05/13/13 09:17 PM Attachment (12 downloads)

Lifted this bad boy on the bench tonight. Now the fun begins . . .

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turk123
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Reged: 07/09/10

Loc: N.E. Ohio
Re: Elli Buk Cave 10" Cassegrain [Re: turk123]
      #5858606 - 05/13/13 09:19 PM Attachment (10 downloads)

I started by removing the DEC setting circle and a nylon washer behind it. Comes off with a set screw.

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turk123
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Reged: 07/09/10

Loc: N.E. Ohio
Re: Elli Buk Cave 10" Cassegrain [Re: turk123]
      #5858609 - 05/13/13 09:21 PM Attachment (9 downloads)

Next is the RA setting circle and collar. I had to use paint remover to free up the pieces so they could slide off.

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turk123
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Reged: 07/09/10

Loc: N.E. Ohio
Re: Elli Buk Cave 10" Cassegrain [Re: turk123]
      #5858616 - 05/13/13 09:23 PM Attachment (12 downloads)

Slide the collar off and then the circle.

Edited by turk123 (05/13/13 09:24 PM)


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turk123
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Reged: 07/09/10

Loc: N.E. Ohio
Re: Elli Buk Cave 10" Cassegrain [Re: turk123]
      #5858619 - 05/13/13 09:24 PM Attachment (9 downloads)

Three thumb screws remove the motor cover.

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turk123
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Reged: 07/09/10

Loc: N.E. Ohio
Re: Elli Buk Cave 10" Cassegrain [Re: turk123]
      #5858621 - 05/13/13 09:25 PM Attachment (11 downloads)

Another picture

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turk123
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Reged: 07/09/10

Loc: N.E. Ohio
Re: Elli Buk Cave 10" Cassegrain [Re: turk123]
      #5858623 - 05/13/13 09:27 PM Attachment (10 downloads)

The DEC motor was hanging by one screw. I am hoping it is OK.

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turk123
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Reged: 07/09/10

Loc: N.E. Ohio
Re: Elli Buk Cave 10" Cassegrain [Re: turk123]
      #5858627 - 05/13/13 09:28 PM Attachment (10 downloads)

I removed the brass cover by loosening the one hex screw on the end of the cover.

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turk123
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Reged: 07/09/10

Loc: N.E. Ohio
Re: Elli Buk Cave 10" Cassegrain [Re: turk123]
      #5858631 - 05/13/13 09:29 PM Attachment (12 downloads)

That reveals the worm gear. It looks pretty rusty but I think it will clean up. Into the the rust remover pail.

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turk123
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Reged: 07/09/10

Loc: N.E. Ohio
Re: Elli Buk Cave 10" Cassegrain [Re: turk123]
      #5858637 - 05/13/13 09:32 PM Attachment (11 downloads)

The motor was hanging on by one bolt. It looks OK! I have not run any of the motors yet. Gonna need some help there.

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turk123
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Reged: 07/09/10

Loc: N.E. Ohio
Re: Elli Buk Cave 10" Cassegrain [Re: turk123]
      #5858639 - 05/13/13 09:33 PM Attachment (12 downloads)

Close up of the work gear. It comes off the aluminum bracket by removing to hex bolts from behind.

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