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Focuser,lazy susan for Odessey 2 17.5"

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#1 De Lorme

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Posted 09 December 2012 - 08:15 PM

Hi, I found a Odessey 2 17.5" on Craiglist. Both mirrors where in great condition so I bought it. Any idea where I might find a focuser and a lazy susan {base does not rotate} for it. This mirror is huge :jump:

Thanks for your help! De Lorme

#2 DavidC

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Posted 09 December 2012 - 08:51 PM

Go to www.scopestuff.com for some great astronomy stuff. I bought my Crayford focuser from them a couple of years ago, and it works great. Try Ace hardware, Home Depot, and Lowes for Lazy Susan bearings, I use those on my bases also. I just adjust the tension with the center bolt.
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#3 kfiscus

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Posted 09 December 2012 - 09:29 PM

Are you going to keep it near its original configuration or are you going to rebuild it a lighter form? Those particle board Odysseys were brutally heavy.

By the way, go job finding that large glass!

#4 De Lorme

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Posted 09 December 2012 - 09:44 PM

Hi Sage, Well I was just fishing on Craigs List and there she was. I was going to paint it black{from red} and put the rest into the base,focuser and MABEY Meads 5000 82 degrees 14mm. What do you think? De Lorme

#5 De Lorme

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Posted 09 December 2012 - 09:59 PM

BTW, Lowes has a 12" lazy Susan;would that be enough for
a 23.5 X 23.5 base? I have a 10x 10 rool off roof in the back yard{I'm so glad I built it} that this will fit,just barely. I cannot wait to look through it! De Lorme

#6 Tom and Beth

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Posted 09 December 2012 - 11:05 PM

Lee Valley HArdware has Aluminum Lazy Susan Bearings, a bit more expensive but EXTREMELY well built. You'll still need a bit of Teflon in order to maintain "stiction"



#7 De Lorme

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Posted 09 December 2012 - 11:36 PM

Do you think the Aluminum 17.375"{$60}is what I should buy or would th 12" Zinc plated {$9} would work effectively?
Where could I buy the Teflon and how would I apply it?
Thanks for your help, De Lorme

#8 kfiscus

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Posted 09 December 2012 - 11:40 PM

ScopeStuff has teflon blocks and strips.

#9 Dick Jacobson

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Posted 10 December 2012 - 09:18 AM

Do you think the Aluminum 17.375"{$60}is what I should buy or would th 12" Zinc plated {$9} would work effectively?
Where could I buy the Teflon and how would I apply it?
Thanks for your help, De Lorme

I have used several of the 17.375" bearings and they are superb. For extra friction, which you will almost certainly need, you can use ordinary polyethylene (from a food container, for example) against the aluminum. I think the polyethylene/aluminum combination is smoother than teflon/laminate.

#10 De Lorme

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Posted 10 December 2012 - 09:41 PM

Hi Dick, How would place the polyethylene {food container}
against the aluminum housing? Could you send me picture?
Thanks for the advice. I was leaning toward the teflon/
laminate which is $20 higher. Thanks De Lorme

#11 Dick Jacobson

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Posted 11 December 2012 - 09:49 AM

I attached the polyethylene to an aluminum bar, which is attached to the telescope. The polyethylene rubs against the outer rim of the Lazy Susan. At first I used epoxy to glue the polyethylene to the aluminum, but epoxy doesn't seem to adhere very well to polyethylene so I ended up using a pair of screws. I don't have a photo available right now but maybe later today.

#12 De Lorme

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Posted 11 December 2012 - 10:43 AM

Hi Dick,Ken,Tom and Beth: I was thinking seriously about the Sky Scout until I ran accros this site "A differant way
to get there" by Rob Nabholz. Check it out! It cost a little more but theres no problems and the accuracy is
really great. The technology we have to day is just unbelievable. I really appreciate the advice. If it wasn't
for your help I would really struggle. Thanks much!
I think there should be a Cloudy Nights convention! Now that would be really fun! Merry Christmas De Lorme

#13 Dick Jacobson

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Posted 11 December 2012 - 10:57 PM

I attached the polyethylene to an aluminum bar, which is attached to the telescope. The polyethylene rubs against the outer rim of the Lazy Susan. At first I used epoxy to glue the polyethylene to the aluminum, but epoxy doesn't seem to adhere very well to polyethylene so I ended up using a pair of screws. I don't have a photo available right now but maybe later today.

Here is the promised photo. The green piece of polyethylene is held against the Lazy Susan outer rim by a piece of aluminum. This is an equatorial mount, the Lazy Susan is part of the polar axis, so it is different from what you are doing but you should be able to come up with some kind of arrangement that will work. I suppose the outer ring of the Lazy Susan will be bolted to your ground board. You would attach the polyethylene and its support to the bottom of your rocker box so it rubs against the outer ring as the box rotates. It is helpful if you have some kind of mechanism to adjust the force.

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#14 De Lorme

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Posted 13 December 2012 - 11:13 PM

Hi Dick, Would you take a look at these picture and tell me what you think. I put my Chelhire in and put the black dot
in the donut of the primary. I could see the whole primary
in the collomator cap. The cross hairs chelshire was some what close so I left it.
My concern is when using Meads 32mm Super Plossi { the sky was pretty bad} the stars were fairly tight, but when going to a 10mm{Meads Super Plossi 20mm barlowed} it was not good. I had read that some of these towards the end of Odessey being in buisness the quality got bad. Is it so with this one? I appreciate your opinion whether good or bad. If bad, would it be worth it to have it refigured?
Thanks for help. De Lorme

#15 De Lorme

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Posted 13 December 2012 - 11:36 PM

This going to take a few minutes. Forgot to crop and compress. See ya in a little bit. De Lorme

#16 De Lorme

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Posted 14 December 2012 - 12:54 AM

Here they are. De Lorme

#17 De Lorme

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Posted 14 December 2012 - 01:01 AM

Had to crop again. De lorme

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#18 De Lorme

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Posted 14 December 2012 - 01:02 AM

I have 4 more.De Lorme

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#19 De Lorme

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Posted 14 December 2012 - 01:13 AM

Hi Dick,I know these are not good. The rest it would not take. Well, Can you formulate any opinion on what's there.
Thanks for the help. De Lorme

#20 Dick Jacobson

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Posted 14 December 2012 - 10:21 AM

It's impossible to tell the quality of the mirror from a photo. The fact that the mirror is dirty should have little impact on the star images. Poor star images can be caused by poor optics, unsteady atmosphere, warm air in the tube (usually caused by a warm mirror), or misalignment. Often it is a combination of all of these. When testing, be sure that your mirror and tube have thoroughly cooled off (at least an hour outside). It helps to have a fan blowing at the back of the mirror. If bright star images are unsteady (squirming around) it is probably the fault of the atmosphere. If star images look like little comets, your mirrors are probably misaligned.

I'm not an expert on Coulter products; I remember reading that some of them were not very good. Maybe someone else who knows more can jump in here.

#21 De Lorme

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Posted 14 December 2012 - 11:50 AM

It's been in my garage which is quit cold now. When I focus
inside and outside the arry disk looks pretty even. But the weather is bad. I'm going to buy the Easytester. That should give me some idea of the optics. I'll be back in a week to let you know the results. De Lorme

#22 De Lorme

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Posted 14 December 2012 - 11:53 AM

I'm going to buy the Easytester. That should give some idea of the optics. I'll be back in a week to share the results.
De Lorme

#23 Dick Jacobson

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Posted 14 December 2012 - 12:29 PM

I had never heard of the Easytester, although I have used a Ronchi grating. Looks like a neat idea!

#24 De Lorme

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Posted 24 December 2012 - 06:15 PM

Hi Everybody! I got the EasyTester on Saturaday. But I won't be able to test the optics until at least Thursday.
I just finished giving the base and circular boards on which the lazy susan sits it's second coat of Valspare VERY BLACK. And it is black. Wensday I'm making the setting circle using Rob Willett's setting circle program. I should
be able to assemble it on Thursday. This is so exciting! At the same time of checking the optics I'm going to check the height of the old focuser so I'll no the requirements of a new one. See ya in a couple of days. De Lorme

#25 MessiToM

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Posted 25 December 2012 - 04:28 PM

Easytester? Got a link. I have a truss dob built around a 17.5" Coulter primary and secondary. Iam quite pleased with its images.






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