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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
Re: 17" CDK and Equatorial Mounting new [Re: Dennis Sakva]
      #5353833 - 08/05/12 09:32 PM

1/2" - I'll post some pics on the mirror cell itself soon

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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5355926 - 08/07/12 04:16 AM

quick update for the primary mirror cell (18 floating points)

blog + info + pics: http://cooledpix.com/2012/08/07/cdk17-primary-mirror-cell/




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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5357219 - 08/07/12 09:52 PM

Another quick update: assembly of the front cell/spider.





http://cooledpix.com/2012/08/07/cdk17-front-cell/


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rogercelliott
sage


Reged: 09/19/08

Loc: Redding, CA
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5357339 - 08/07/12 11:17 PM

Wow... awesome. I so miss having access to CNC machine tools!
Cheers
Roger


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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: rogercelliott]
      #5358918 - 08/08/12 10:36 PM

Here's the vane preloading mechanism for the spider.



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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5376734 - 08/19/12 10:45 PM

I picked up my worm/gear sets from Mr. Byers yesterday:

For declination it's a 12"-360


And for right ascension it's a 15.25"-485


Both use the same worm, but the RA worm has been diamond lapped for added accuracy.


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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5376740 - 08/19/12 10:53 PM

I've also built a mobile pier to have a solid base to assemble the equatorial mount that I will start machining shortly. I wanted something decent so that I can also use it from my garage for testing/tweaking (when it's finished) as I won't have the observatory to set everything up just yet...

It's mobile and vastly inspired by the stuff from PierTech to keep things simple.


more info here: http://cooledpix.com/2012/08/19/z-pier-introduction/

and some pics...













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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5382055 - 08/23/12 01:00 AM



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m. allan noah
professor emeritus


Reged: 08/14/09

Loc: Virginia, USA
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5382240 - 08/23/12 07:20 AM

Beautiful machining. However, I note several places where you bring a load into the side of an unsupported span, both in the telescope and the pier.

allan


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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: m. allan noah]
      #5389073 - 08/27/12 01:14 AM

lower cage assembly:

link: http://cooledpix.com/2012/08/26/cdk17-lower-cage/




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johnC
member
***

Reged: 08/24/06

Loc: Hucknall Nottingham UK
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5389153 - 08/27/12 03:47 AM

I am following this thread with great interest.
A true work of art.
I cannot wait to see the finished product.
Thank you for sharing.


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Dan McConaughy
sage


Reged: 11/11/06

Loc: LA
Re: 17" CDK and Equatorial Mounting new [Re: johnC]
      #5389290 - 08/27/12 07:47 AM

VERY nice. How thick are you spider vanes? Are you going to install cooling fans in front of your primary mirror?

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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: Dan McConaughy]
      #5389629 - 08/27/12 11:58 AM

Hi,
The 3 cooling fans will be on the back plate either pushing or pulling air to/from the mirror (behind it).
Spider vanes are 316 S-S and 2 mm thick (painted flat black)


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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5396023 - 08/31/12 02:17 AM



I was hoping I could assemble the secondary tonight but I had to rework a few threads that were a little too tight! Guess the complete mock-up will be finished tomorrow.


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TopherTheME
sage
*****

Reged: 02/11/11

Loc: Rochester, MI
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5396706 - 08/31/12 01:05 PM

Nice. Where did you get the CF tubing for poles from?

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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: TopherTheME]
      #5396952 - 08/31/12 03:59 PM

rockwest composite it was I think, I had them cut to length and checked their length before gluing the fittings 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: zytrahus]
      #5397605 - 09/01/12 02:34 AM

probably last update on the telescope before a few months of wait for the optics...
I'll be updating with the work I am going to do for the equatorial mounting though..

http://cooledpix.com/2012/08/31/cdk17-ready-for-the-optics/







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Dick Jacobson
scholastic sledgehammer


Reged: 12/22/06

Loc: Plymouth, Minnesota, USA
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5397749 - 09/01/12 08:40 AM

Gorgeous piece of work! I hope it's as much fun looking THROUGH it as AT it!

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rguasto
scholastic sledgehammer
*****

Reged: 11/18/10

Loc: Long Island, NY
Re: 17" CDK and Equatorial Mounting new [Re: Dick Jacobson]
      #5397762 - 09/01/12 08:56 AM

WOW!

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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting [Re: rguasto]
      #5398143 - 09/01/12 01:25 PM

thanks guys

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