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Equipment Discussions >> ATM, Optics and DIY Forum

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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
17" CDK and Equatorial Mounting
      #5348116 - 08/02/12 03:02 AM

Hello,
I've been working on this for a few weeks already and figured it was time to start to create some kind of work log on here.

I am building a 17" CDK f/6.8 (though I will be buying the optics i.e. mirrors and correctors) and equatorial mounting for it.

All the parts for the telescope have been made already and I have started assembly already. Though I am a little behind on the work log so I will be posting quite a few updates within the next few days!

The assembly should be finished soon, though since I have not ordered the mirrors yet (still saving up) the telescope will be waiting a few months before it sees a light. That being said, I am finishing up the design of the equatorial mounting and should be able to start machining parts shortly. The mount will be tested before the telescope as I have already ordered the worms/gears/motors. This should keep me busy till at least I have the resources for the optics!

I will be keeping my blog updated as I progress.

Here's the first blog entry: http://cooledpix.com/2012/08/01/cdk17-introduction/

and a couple pictures of the CAD work.








Feel free to ask questions about the design. I will populate my entries with as much information as I can.


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kfrederick
Carpal Tunnel


Reged: 02/01/08

Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5348233 - 08/02/12 06:52 AM

Nice CAD work!! What is the mounting look like?

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polaraligned
professor emeritus


Reged: 12/26/08

Re: 17" CDK and Equatorial Mounting new [Re: kfrederick]
      #5348246 - 08/02/12 07:11 AM

Looks very good. Are the optics from the same source that Planewave uses? I only ask because 17" is not a common size.

Also, how are you able to determine that the center ring where the truss attaches will be stiff enough? I see it is cored out there. Did you do any FEA on it?

I will be following your build with interest. Thanks for posting.


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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: polaraligned]
      #5348639 - 08/02/12 12:28 PM

I will post the CAD work for the mounting when I am finished. It slightly differs from a traditional GEM. It's all I say for now


I am not sure where Planewave is getting the optics. But yes it is the same diameter and f ratio.

Yes, the middle cell openings were checked with a static analysis of this middle cell.


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The bear
Pooh-Bah
*****

Reged: 02/11/08

Loc: rushville, indiana
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5348954 - 08/02/12 04:07 PM

this one is so cool i love it i sent you an pm zytrahus
doc


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allardster
sage


Reged: 07/01/11

Loc: Toronto, Ontario, Canada
Re: 17" CDK and Equatorial Mounting new [Re: The bear]
      #5349287 - 08/02/12 08:27 PM

Interesting project, great CAD work.

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Dave O
sage
*****

Reged: 12/21/11

Loc: Sri Lanka
Re: 17" CDK and Equatorial Mounting new [Re: allardster]
      #5349531 - 08/02/12 11:32 PM

Looks like a nice compact design. 17" f/6.8 with two corrector lenses ... do you have a prescription for this design? I'd like to see its 'performance' ...

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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: Dave O]
      #5349661 - 08/03/12 02:20 AM

Thanks guys.
I'll post some optical data soon.

Adding a picture of the parts (they're not all in there) after they came back from anodizing.

The tube assembly in the middle is the corrector/baffle assembly.



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TopherTheME
sage
*****

Reged: 02/11/11

Loc: Rochester, MI
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5350304 - 08/03/12 02:31 PM

Very nice. Where are you getting your parts anodized?

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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: TopherTheME]
      #5350314 - 08/03/12 02:36 PM

A small local shop that goes different kind of plating jobs.

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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5351063 - 08/03/12 11:37 PM

Quick update for the rear cell assembly:




blog entry: http://cooledpix.com/2012/08/03/cdk17-rear-cell/


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polaraligned
professor emeritus


Reged: 12/26/08

Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5351405 - 08/04/12 09:38 AM

Primary is going to be glued in place?

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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: polaraligned]
      #5351813 - 08/04/12 02:37 PM

Nope there is a 18-point floating mirror cell in between the mirror and back plate. More on this very soon

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polaraligned
professor emeritus


Reged: 12/26/08

Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5352079 - 08/04/12 06:30 PM

Only reason I ask is because Planewave glues theirs. Seem it would simplify things. But they are using a conical primary, you obviously are not.

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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: polaraligned]
      #5352285 - 08/04/12 09:08 PM

the mirror will be glued on the 18 point mirror cell, but I wanted to have some freedom adjusting the primary although collimation should not be too much of a problem. Time will tell =)

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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5352604 - 08/05/12 03:29 AM

A couple more pics for the Mid Cell assembly.

http://cooledpix.com/2012/08/05/cdk17-mid-cell/





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johnC
member
***

Reged: 08/24/06

Loc: Hucknall Nottingham UK
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5352656 - 08/05/12 05:50 AM

A work of art.
Just stunning.


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TopherTheME
sage
*****

Reged: 02/11/11

Loc: Rochester, MI
Re: 17" CDK and Equatorial Mounting new [Re: johnC]
      #5353152 - 08/05/12 01:26 PM

Whats the approximate weight of this thing going to be?

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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: TopherTheME]
      #5353192 - 08/05/12 01:51 PM

just about 37 Kg

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Dennis Sakva
Pooh-Bah
*****

Reged: 10/19/04

Loc: Kiev, Ukraine
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5353245 - 08/05/12 02:21 PM

Stephen and how thick is the backplate?

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