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Equipment Discussions >> ATM, Optics and DIY Forum

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starman345
Wait, I'm Thinking
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Reged: 07/06/10

Loc: New Brunswick, Canada
Re: 14" Hubble Optics Project new [Re: starman345]
      #5575755 - 12/17/12 01:47 PM Attachment (39 downloads)

Truss poles and cam clamp installed

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starman345
Wait, I'm Thinking
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Reged: 07/06/10

Loc: New Brunswick, Canada
Re: 14" Hubble Optics Project new [Re: starman345]
      #5575757 - 12/17/12 01:49 PM Attachment (39 downloads)

All the connectors and truss poles assembled

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starman345
Wait, I'm Thinking
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Reged: 07/06/10

Loc: New Brunswick, Canada
Re: 14" Hubble Optics Project new [Re: starman345]
      #5575762 - 12/17/12 01:51 PM Attachment (47 downloads)

With the secondary cage connected. Its starting to look like a telescope!

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sopticals
professor emeritus


Reged: 03/28/10

Loc: New Zealand
Re: 14" Hubble Optics Project new [Re: starman345]
      #5576006 - 12/17/12 04:41 PM

Good progress Brian. You will be looking forward to the night of first light. Nice tidy work shop.

Stephen.(44deg.S.)


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Pinbout
Postmaster
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Reged: 02/22/10

Loc: nj
Re: 14" Hubble Optics Project new [Re: starman345]
      #5576019 - 12/17/12 04:48 PM

Quote:

Truss poles and cam clamp installed




very clean.


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KenScharf
member


Reged: 12/16/12

Loc: South Fla
Re: 14" Hubble Optics Project new [Re: Pinbout]
      #5576297 - 12/17/12 07:46 PM

It's been a while since I last looked at Kriege's book, but you seem to be following it closely. I'm in the process of making a 7" mirror and will probably make a miniature version of his design. I'm giving some though to making the truss clamp blocks by sand casting aluminum a-la Gingery instead of out of wood (though I'd have to make wooden patterns to make the sand molds!).

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starman345
Wait, I'm Thinking
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Reged: 07/06/10

Loc: New Brunswick, Canada
Re: 14" Hubble Optics Project new [Re: sopticals]
      #5576854 - 12/18/12 06:53 AM

Quote:

Good progress Brian. You will be looking forward to the night of first light. Nice tidy work shop.




Yes, while I like using my binoculars its just not the same as a telescope, first light will not come too soon for me. The workshop is the basement of my house, it is clean out of necessity, If I keep a messy shop I end up tracking stuff into the main living quarters...which I hear about from my better half . About a year ago I bought a Ridgid 1450D shop vac which attaches to the dust ports on my table saw, chop saw and a few other tools I have, it really keeps things clean. It has major suction, very highly rated on Amazon.


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starman345
Wait, I'm Thinking
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Reged: 07/06/10

Loc: New Brunswick, Canada
Re: 14" Hubble Optics Project new [Re: Pinbout]
      #5576856 - 12/18/12 06:55 AM


Quote:

very clean.




A coat of flat black paint will make them look like a professional made them


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starman345
Wait, I'm Thinking
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Reged: 07/06/10

Loc: New Brunswick, Canada
Re: 14" Hubble Optics Project new [Re: KenScharf]
      #5576876 - 12/18/12 07:21 AM

Quote:

It's been a while since I last looked at Kriege's book, but you seem to be following it closely.



I do have the book and started out intending to follow it closely but I've drifted away from it in several respects. Reading this and other forums has given me several ideas to incorporate into the build.

Quote:

I'm in the process of making a 7" mirror and will probably make a miniature version of his design. I'm giving some though to making the truss clamp blocks by sand casting aluminum a-la Gingery instead of out of wood (though I'd have to make wooden patterns to make the sand molds!).




Thats interesting about sand casting the truss clamp blocks in aluminum. If you end up doing it I hope you start a thread about it on the forum.


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starman345
Wait, I'm Thinking
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Reged: 07/06/10

Loc: New Brunswick, Canada
Re: 14" Hubble Optics Project new [Re: starman345]
      #5626777 - 01/16/13 06:44 PM Attachment (34 downloads)

After a break I"m back at it in the shop. I hope everyone had a good holiday.
I made a cover for the mirror box to protect the mirror, nothing special just 5mm ply with a piece of 1" dowel for a knob


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starman345
Wait, I'm Thinking
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Reged: 07/06/10

Loc: New Brunswick, Canada
Re: 14" Hubble Optics Project new [Re: starman345]
      #5626779 - 01/16/13 06:46 PM Attachment (24 downloads)

I got a new Bosch router for Christmas so I routed out the altitude bearings and glued and clamped on the ebony star

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starman345
Wait, I'm Thinking
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Reged: 07/06/10

Loc: New Brunswick, Canada
Re: 14" Hubble Optics Project new [Re: starman345]
      #5626784 - 01/16/13 06:47 PM Attachment (27 downloads)

Then the fine touches with a file

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starman345
Wait, I'm Thinking
*****

Reged: 07/06/10

Loc: New Brunswick, Canada
Re: 14" Hubble Optics Project new [Re: starman345]
      #5626791 - 01/16/13 06:51 PM Attachment (27 downloads)

Tonight I set the bearing at 30 degrees to the mirror box and clamped it in place. Tomorrow I"ll drill the holes to anchor both of them.
I came up short of plywood so ordered another sheet that will be in tomorrow, then I can make the ground board and then put it all together. Then the test under the stars...


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sopticals
professor emeritus


Reged: 03/28/10

Loc: New Zealand
Re: 14" Hubble Optics Project new [Re: starman345]
      #5626842 - 01/16/13 07:32 PM

Looking good Brian.

Stephen.(44deg.S.)


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starman345
Wait, I'm Thinking
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Reged: 07/06/10

Loc: New Brunswick, Canada
Re: 14" Hubble Optics Project new [Re: sopticals]
      #5627786 - 01/17/13 10:44 AM Attachment (43 downloads)

I installed the bearings this morning and put the telescope together. It balances!!! With nothing in the focuser the ota drifts up just slightly, with my 21E, 13E, and 6.7ES it stays wherever I put it I did the balance calculations based on the weight of the 13E which is less than the 21 but more than the 6.7.
I was hoping to take the scope for a test run this weekend but now I see the forecast calls for cloudy and snow, maybe I"ll wait until next weekend when it is -30


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sopticals
professor emeritus


Reged: 03/28/10

Loc: New Zealand
Re: 14" Hubble Optics Project new [Re: starman345]
      #5628488 - 01/17/13 05:12 PM

Really nice Brian.WOW!!! look at all those great "hogging tools" in the back ground.

Stephen.(44deg.S.)

Edited by sopticals (01/17/13 05:13 PM)


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starman345
Wait, I'm Thinking
*****

Reged: 07/06/10

Loc: New Brunswick, Canada
Re: 14" Hubble Optics Project [Re: sopticals]
      #5628701 - 01/17/13 07:21 PM

You are showing your real colors Stephen, only a true glass pusher would see weightlifting equipment and think "hogging tools"!!!

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starman345
Wait, I'm Thinking
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Reged: 07/06/10

Loc: New Brunswick, Canada
Re: 14" Hubble Optics Project new [Re: starman345]
      #5651905 - 01/30/13 09:41 AM Attachment (28 downloads)

The telescope is finished, except for some varnishing on the rocker box and ground board. I've done some sanding on the ends of the truss poles so they slip into the lower truss connectors easily and also, cut them all exactly the same length so collimation doesn't change from setup to setup. Well, sometimes I need to tweak one of the secondary tilt screws but I think it holds collimation pretty well.
A couple of days ago I took the scope out for its first light and was disappointed, at least at first. My eyepieces all came to focus but I had a hard time bringing the stars to points. I had let the scope sit about 45 minutes outside but apparently that wasn't enough, I came back about an hour later and the difference was like night and day, stars were much sharper. The scope had been in my basement at 70F before taking it outside where it was a cool windy 15F, so maybe it takes more time with that kind of temperature difference. Hubble Optics advertise that these sandwich mirrors cool down really quickly but maybe I was asking too much for that temperature range. The clouds rolled in and ended my session way too early.
Today I played with the mirror a bit, the top post(wood dowel) that holds the retaining clip was rubbing against the mirror so I backed it off and I think that may have helped the images tonight. Glass seems to be really sensitive.
I set the scope up outside about 4 pm and around 7pm I went out and found M42 in my Stellarvue finder then put the Ethos 21mm in the focuser, what a sight, I have never seen M42 like that before, so much detail I didn't realize was there. The 21mm is so wide and the dust lanes were streaming out in all directions. This was really the first time I"d got to use the 21mm, having acquired it a few months ago while the scope was under construction and I had no way to try it. I adjusted the Stellarvue to more precisely line up with the scope and swung around to Jupiter, really nice, put in the Ethos 13mm and just took it all in. My other scope was a 10" and with this 14" there really is a big difference. I can definately see more bands and they seem sharper. I put the Explore Scientific 6.7mm in the focuser to have a closer look but for some reason I couldn't really get the detail the 13 & 21 were showing. I"m not sure why, maybe the seeing wouldn't support the power.
I am noticing the stars away from the center of view are pretty fuzzy, I suppose that is coma and I'll probably have to get a Paracorr, no sense having expensive wide FOV eyepieces unless the whole view is sharp.
I played with the focus, both at zenith and various angles towards the horizon, the stars seem to get harder and harder to focus to points from around 45 degrees down to the horizon. The cell may need to be re-done, changed to a sling, or something else but first I'll need more viewing sessions to make sure what is going on.
All in all I'm very happy with the telescope, a great fun project, frustrating at times but rewarding. I couldn't have done it without all the help I got here on the forum, in this thread and from other forums as well, also, Reiner Vogel's excellent website was great in helping me understand some of the geometry and design concepts. Thanks everyone.


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starman345
Wait, I'm Thinking
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Reged: 07/06/10

Loc: New Brunswick, Canada
Re: 14" Hubble Optics Project new [Re: starman345]
      #5651914 - 01/30/13 09:44 AM Attachment (28 downloads)

The scope sporting a black shroud. I bought the nylon-lycra material for $18 and a local seamstress put it together for $10.

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PaulEK
professor emeritus
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Reged: 05/25/08

Loc: Wisconsin
Re: 14" Hubble Optics Project [Re: starman345]
      #5652358 - 01/30/13 01:41 PM

Looks great!

I've been following your thread, in part because I'm hoping to build a scope around the Hubble 14" sandwich mirror, but I plan to put mine on an EQ mount. It's good to hear that the mirror seems all right. I do plan to have mine sent directly to someone who can test it, and then re-figure it if needed.

I also have a 10" reflector. It has a Hubble mirror that gives fine views, but that didn't happen until after it was re-figured by this same person. He figured it was about 1/3rd wave or worse before re-figuring, and about 1/10th after. The difference in viewing was vast!


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