Truss Dob #2 (Return of the GSO)

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Erik
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Tue May 10, 2016 9:36 pm
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Wow, I love the design. The vanes look micro thin! How heavy is your secondary? It's a small part of everything but that's great woodwork on the sec mirror mount.

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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Wed May 11, 2016 7:10 pm
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Thanks Erik. The wooden mount got hosed. Lets just say after two failed attempts I had to build a new part, so i decided to instead go with an aluminum mount. The first time I mounted the mirror to the stalk i used old silicone caulk. The curing agent had expired, so it never set. The second time I used fresh silicone, but realized too late that I had poorly measured the mount length, so the mirror mung to low and didn't center in the focuser.

The aluminum piece ended up being fan nicer, and won't suffer from threads stripping over time.

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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Wed May 11, 2016 7:12 pm
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Erik, you asked about the spider weight. I forgot to weigh it before attaching, but the final weight of the UTA completely assembled is less than 28 ounces!

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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Wed May 11, 2016 7:16 pm
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It was pointed out to me that having the teflon pads on the box instead of the base could cause warping over time. So I put laminate on the bottom of the rocker box, and I will be mounting the teflon above the feet on the base, essentially preventing any flex. Rookie mistake. The fix was fortunately easy.

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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Wed May 11, 2016 7:18 pm
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The last job of the day was to test the focal point, so I can measure the length for the truss tubes. Done. 48.5".

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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Fri May 13, 2016 4:00 am
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Teflon now transferred from the rocker box to the base plate, just above the feet. No more concern for warpage!

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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Fri May 13, 2016 4:01 am
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Truss poles cut to length.

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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Fri May 13, 2016 4:09 am
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I finished edge sanding the alt bearings. Then I ran the numbers to calculate COG and determined 9" from the bottom of the box. I conservatively added a half inch to be on the safe side. I had to deal with a top heavy design with my 10" build. Adding ballast to the mirror box was a nightmare, and counter productive of a light weight design. I screwed the bearings into place temporarily. Eventually those points will be attached with thumb screws and insert nuts.

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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Fri May 13, 2016 4:14 am
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Balance was off just slightly with the T6 Naglers, being just slightly bottom heavy. Haha, I probably could move the bearing lower by the original measurement. But I instead chose to add a solid aluminum handle to double as a counter balance. I had a piece of 1" round extruded rod sitting on the shelf, so I trimmed to ends to clean off the burrs, and hand sanded with 60, 120, and 220 grit to a satin finish. Tapped with 1/4-20 and affixed with a thumb screw.

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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Fri May 13, 2016 4:15 am
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Waiting for nightfall.

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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Fri May 13, 2016 4:17 am
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So last night was the inaugural session, and I was joined by my 12 year old daughter. Everything works. Collimation was a snap. Flex was non existent with altitude changes. The fan caused no high frequency blur. And the axial movements were smooth. Next steps: finish the alt bearing connection points, blacken the internals, and poly the wood. Yahoo!

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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Fri May 13, 2016 4:18 am
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Oh, and take down took me about 2 minutes in the field.

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Erik
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Sat May 14, 2016 2:07 am
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Congrats Jason!!! That is one gorgeous looking scope. Great work, man- very impressive.

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Homebuilt 16" Truss Dob
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SV 80mm ED Nighthawk NG on M1 ALT/AZ
Nikon Prostaff 65mm spotter on Trekpod
Konusvue 20x80 binos/Peterson PipeMount


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Not Sure
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Sat May 14, 2016 11:19 am
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thanks Jason, nice job . great thread

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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Sat May 14, 2016 3:12 pm
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Not Sure wrote:
thanks Jason, nice job . great thread
Thanks, Gene! Glad you enjoyed my partially inept creativity. :grin:

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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Sat May 14, 2016 3:14 pm
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Erik wrote:
Congrats Jason!!! That is one gorgeous looking scope. Great work, man- very impressive.
Thanks, Erik! I've got a couple more tricks up my sleeve before I declare it completed. A couple new design add-ons have been brewing up in the old noggin.

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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Tue May 17, 2016 7:02 am
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More work has been accomplished. First, the alt bearing were converted to removable parts by hand during break down, thanks to insert nuts and hand knobs.

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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Tue May 17, 2016 7:04 am
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The next step was adding a drawer to the bottom of the Rocker box for eyepiece and small part storage.

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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Tue May 17, 2016 7:08 am
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I then had a eureka moment on where I could store the alt bearings during collapse/transport. Tell me this isn't clever. Of course, I have to give credit all those years of playing with Transformers as a kid. :lol:

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Erik
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Tue May 17, 2016 2:05 pm
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That's pretty cool. Great idea- no need to lug a separate eyepiece case. Now you've got me thinking I need something like that!

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Homebuilt 16" Truss Dob
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SV 80mm ED Nighthawk NG on M1 ALT/AZ
Nikon Prostaff 65mm spotter on Trekpod
Konusvue 20x80 binos/Peterson PipeMount


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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Tue May 17, 2016 3:36 pm
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I know a compliment when I smell one...thanks, bro!

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Erik
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Wed May 18, 2016 9:44 am
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Definitely a compliment! Makes me wonder why scope manufacturers don't do that- it at least offer it as an option. Much better than the eyepiece brackets that instantly dew up all your glass.

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Homebuilt 16" Truss Dob
8" Antares f/5 Newt
SV 80mm ED Nighthawk NG on M1 ALT/AZ
Nikon Prostaff 65mm spotter on Trekpod
Konusvue 20x80 binos/Peterson PipeMount


"Newt Gingrich is what stupid people think smart people sound like."
-The Great Paul Krugman

Evolution is both fact and theory. Creationism is neither. -Anonymous


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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Wed May 18, 2016 10:07 pm
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Yeah, good point about the dew. It kind of came to me in a dream. LOL. I envisioned having the scope collapsed, as a compact box, with all the parts necessary stored into the collapsed box-like structure. I figured it would be cool if I could design the box/scope to be light enough to carry by hand some distance, with the truss poles in a sling over my back. Then I could access dark sites easier, without needing multiple trips.

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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Sun May 22, 2016 6:38 pm
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Blackening the internals.

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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Sun May 22, 2016 6:40 pm
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For the 12mm truss poles I bought a big roll of 18mm shrink tube. I like the fact that it doesn't have lettering, but was unhappy with the wrinkle finish. It is simply at the threshold of size here for a tight wrap, and it left buckles along the entire pole. So I found a piece of 13mm I had lying around and tested on some 12mm tube. The wrap was perfectly tight and uniform. I couldn't find 13mm in large quantities for a reasonable price so I settled on a 33ft piece of 14mm. It should be here in a couple weeks. Here's hoping. The bottom pic shows the 18mm vs the 13mm.

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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Sun May 22, 2016 6:42 pm
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I designed a shield out of 1/32" Finnish birch (to match the scope), and designed it to fit into the mirror box perfectly under the UTA, acting as a dust cover for the primary mirror. The fittings you see in the image are temporary. I have since purchased small thumb screws.

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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Sun May 22, 2016 6:43 pm
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For the blackened inner walls and surfaces I chose to use black stain, instead of a completely opaque paint. This was a purely aesthetic choice, because I want to retain the furniture feel throughout. I figured it will be dark enough for use in my backyard, which sports NELM 6.0 skies at zenith.

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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Sun May 22, 2016 6:44 pm
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Location: In search of the ultimate switchbacks and single tracks
 
The next step was to poly coat this sucker. I used Waterlox XL-89 satin urethane, my every and all wood coating of choice. Once cured I sanded all black stained surfaces lightly with "00" steel wool, and all external surfaces with "0000". In the last pic you can see one side of a pair of heavy duty knobs that will act as handles to easily lift the mirror box from the rocker box.

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Jason® (Admin...and spoke-folk)
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Single ride personal records: Distance-76.7miles, Max Speed-50.4mph, Max sustained speed (20miles) 19.5mph
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Erik
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Tue May 24, 2016 2:09 pm
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Interesting idea with the stain. Looks great and you never have to worry about it peeling off like flocked paper. Such a great project!

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Homebuilt 16" Truss Dob
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Chopin
Post subject: Re: Truss Dob #2 (Return of the GSO)
Posted: Tue May 24, 2016 2:58 pm
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Location: In search of the ultimate switchbacks and single tracks
 
Thanks, man!

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Jason® (Admin...and spoke-folk)
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[ img ]
[ img ]
Veritable Imagery
Single ride personal records: Distance-76.7miles, Max Speed-50.4mph, Max sustained speed (20miles) 19.5mph
“Life is like riding a bicycle. To keep your balance, you must keep moving.” ― Albert Einstein


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