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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: Chucke]
      #5456931 - 10/05/12 06:01 PM

Yes I am, I go to Anza at least once a month. Will be there tomorrow if the weather permits but it doesn't look so good right now...

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Mike I. Jones
Post Laureate
*****

Reged: 07/02/06

Loc: Fort Worth TX
Re: 17" CDK and Equatorial Mounting new [Re: TopherTheME]
      #5456981 - 10/05/12 06:49 PM

Stephen,
Some questions on your CDK:

1. Did Planewave give you any tolerance data for airspacing, allowable tilt and decenters? Do you have an idea about how closely you must build your hardware to nominal values, and how much tilt/decenter adjustment you must provision for?

2. Is Planewave going to analyze and optimize your as-delivered optics with real as-manufactured values for radii, lens thicknesses and glass melt data? Or are they assuming your delivered system meets nominal prescription values that were manufactured perfectly? (I hope not).

3. Did they also design the primary and secondary baffles for you and you are building to those drawings?

Thanks,
Mike


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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: Mike I. Jones]
      #5457017 - 10/05/12 07:19 PM

Hi Mike,
I haven't been in contact with Planewave at all. HO provided me with some mechanical specifications about their optics such as mirror spacing, back focal distance, corrector to primary distance, "some" dimensions for the baffles, and I'm probably forgetting a few others. I have no data on tilt/decenter adjustments. I've designed primary and secondary cells so that I can adjust tilt/decenter and spacing, hopefully that'll give me flexibility during adjusting/collimating.


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Chucke
member


Reged: 03/12/10

Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5459640 - 10/07/12 05:50 PM

I am at the upper pads. I have the 16" on a big GEM. You should come up to visit sometime. I will be out next weekend weather permitting.

I am looking forward to seeing your scope when it is done.

Chuck


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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: Chucke]
      #5459700 - 10/07/12 06:34 PM

Hi Chuck, I was there last night for some testing of my new camera. It was cloudy most of the night but clear enough for the kind of tests I needed to do. Provided I can modify my 10" f/4 Newtonian this week I will be visiting the SDAA dark site next week-end. If I still need some testing done on the Newtonian/new camera I will be going to Anza instead.

Which pad are you using? one of those on Mars Hill? Do you own an observatory or just the pad?


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Chucke
member


Reged: 03/12/10

Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5461422 - 10/08/12 11:18 PM

Hi Zytrahus,

I am on upper pads at the top of the hill or as we used to call it The Upper Pad Yacht Club. I don't have an observatory. I thought about building one once but decided that I wasn't going to stay in CA long enough to justify the cost. I am on the eastern row of pads second one from the north hidden by a tree.

Chuck.


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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: Chucke]
      #5472614 - 10/16/12 12:46 AM

I received the spur gear for the drive system, I'll get it installed and post some pictures. I'll probably do some tests with the Gemini controller and see how that goes!

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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5481282 - 10/21/12 01:09 AM

Here's a picture with the spur gear installed



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TxStars
Pooh-Bah
*****

Reged: 10/01/05

Loc: Lost In Space
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5481324 - 10/21/12 02:12 AM

Where did you order the spur gears from?

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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: TxStars]
      #5481328 - 10/21/12 02:22 AM

From Mr. Byers. He made them to my specs.

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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5492553 - 10/28/12 01:31 AM

Quick update with the RA bearing blocks:

http://cooledpix.com/2012/10/27/eq-z-ra-bearing-blocks/





Next I will make the rest of the parts for the RA housing and there is quite a bit of work there =)


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angusb1
member


Reged: 06/14/10

Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5492600 - 10/28/12 02:43 AM

Hi Stephen,

I've been following your build over the last few weeks and you're coming to the part I find particularly interesting now, the building of the equatorial mount. I hope you don't mind me asking what size shafts/bearings you're using? Also, will the shafts be solid or hollow, and what kind of bearings are those?

Fascinating build, thanks for sharing it in such detail.


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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting [Re: angusb1]
      #5493603 - 10/28/12 07:49 PM

Thanks Angus, these are tapered roller bearings the bigger one is 150 mm OD and the smaller one is only ~130 mm. Both RA and DEC shafts will be hollow and about 110 mm to the front and 90 mm to the rear.

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angusb1
member


Reged: 06/14/10

Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5494198 - 10/29/12 08:10 AM

Thanks Stephen.

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123456
sage
*****

Reged: 11/05/06

Loc: mid tenn
Re: 17" CDK and Equatorial Mounting new [Re: angusb1]
      #5495697 - 10/30/12 02:04 AM

great thread stephen

just wondering how are you setting the pre load on the bearings ?

joe


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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: 123456]
      #5495712 - 10/30/12 02:38 AM

preload is done with a preloading plate (made of thick SS) that is bolt on the rear of the shaft in 6 points (60 degrees apart). The front of the shaft is shouldered to sit on the inner ring of the front bearing.

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coinboy1
sage
*****

Reged: 05/03/11

Loc: Tulsa, OK
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5495828 - 10/30/12 07:18 AM

I have to say this build is amazing and inspiring. I have dreamed of using CNC equipment to build a scope such as this. Your engineering and machining skills are excellent. I am loving it.

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Baxstar
member


Reged: 09/15/12

Loc: The Netherland
Re: 17" CDK and Equatorial Mounting new [Re: coinboy1]
      #5496200 - 10/30/12 01:35 PM

Where can i order? No just kidding, really like your project and I will be following it!

Casper


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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: Baxstar]
      #5590200 - 12/26/12 07:55 PM

It's already been more than 1 months since I have put more work on this but unfortunately, I've had a real busy end of year and I am hoping I will be able to make more parts early 2013.

One good news though, the optics for the CDK are being made and I should have them in 3 months!


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zytrahus
professor emeritus


Reged: 06/16/09

Loc: Long Beach, CA
Re: 17" CDK and Equatorial Mounting new [Re: zytrahus]
      #5778401 - 04/04/13 07:21 PM

Quick updates, I haven't had a chance to make any other part, 2013 has been busier than expected but I have good hopes for the next few weeks!

The optics are almost finished (probably a couple of weeks + another 4 weeks for surface shipping)!

Also I am hoping to move to the mountains (mount Pinot area, CA) toward the end of the summer, where I'll finally be able to build a small observatory.


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