Return to the Cloudy Nights Telescope Reviews home pageAstronomics discounts for Cloudy Nights members
· Get a Cloudy Nights T-Shirt · Submit a Review / Article

Click here if you are having trouble logging into the forums

Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User

Equipment Discussions >> ATM, Optics and DIY Forum

Pages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | (show all)
Sean Cunneen
Let Me Think
*****

Reged: 08/01/07

Loc: Blue Island Illinois
Re: My 16" f7.2 Newt project code named "Grace" new [Re: Jeff Morgan]
      #5783632 - 04/07/13 11:49 AM

Thanks Jeff, I am going to have my trusses fasten semi-permenantly to the top baffle which will then bolt to my LTA. Because of the overall size of the scope, I had to think about construction and transportationo in terms of sub-assembly, so the scope will break down into 3 main pieces that should *just* fit in the back of my Caravan. If I should be forced to carry passengers or another scope, then the truss assembly will break down more traditionally and I'll assemble the trusses on the field. When the trusses look to be in the 7'-8' long range, I think you should evaluate traditional dob set up and breakdown proceedures very carefully. I'll be putting this thing together myself in low-light conditions and since the weights and moments of these long pieces will bend or snap their mounting points if something bad happens, I have to have some options!

Post Extras: Print Post   Remind Me!   Notify Moderator  
Sean Cunneen
Let Me Think
*****

Reged: 08/01/07

Loc: Blue Island Illinois
Re: My 16" f7.2 Newt project code named "Grace" new [Re: Sean Cunneen]
      #5789261 - 04/09/13 10:26 PM Attachment (37 downloads)

Some more progress:
The cell support is built from angle iron scavenged from the chair and some 3/4" square iron stock. I can't weld, so some drilling, tapping and pretty stainless steel socket head screws. The cell and mirror will ride on this frame and I am going to hinge the assembly so that I can insert the mirror easily once the whole scope is assembled on the field.

Edited by Sean Cunneen (04/09/13 10:29 PM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
Sean Cunneen
Let Me Think
*****

Reged: 08/01/07

Loc: Blue Island Illinois
Re: My 16" f7.2 Newt project code named "Grace" new [Re: Sean Cunneen]
      #5789269 - 04/09/13 10:34 PM Attachment (35 downloads)

Now, here is where we get to some fun stuff. Lets be honest, there is not a whole lot you can do with a newt these days, so I had to have some fun somewhere! Bear in mind, the pictures that follow are only rough-fit, nothing is glued yet so things look pretty rough, but you'll get the idea soon enough!

Post Extras: Print Post   Remind Me!   Notify Moderator  
Sean Cunneen
Let Me Think
*****

Reged: 08/01/07

Loc: Blue Island Illinois
Re: My 16" f7.2 Newt project code named "Grace" new [Re: Sean Cunneen]
      #5789273 - 04/09/13 10:36 PM Attachment (31 downloads)

Here is the underside to show some structure. The mirror is pretty hefty, so the pieces are all stiff and thick. I'm not going to go into any detail about what the next few posts will show...

Post Extras: Print Post   Remind Me!   Notify Moderator  
Scanning4Comets
Markus
*****

Reged: 12/26/04

Re: My 16" f7.2 Newt project code named "Grace" new [Re: Sean Cunneen]
      #5790629 - 04/10/13 04:09 PM



Post Extras: Print Post   Remind Me!   Notify Moderator  
Sean Cunneen
Let Me Think
*****

Reged: 08/01/07

Loc: Blue Island Illinois
Re: My 16" f7.2 Newt project code named "Grace" new [Re: Scanning4Comets]
      #5885741 - 05/26/13 03:05 PM Attachment (24 downloads)

Another update! Starting to feel the progress coming along. Worked through some mistakes and some miscalulations. I found some others but I'll keep those to myself

The mirror cell is now roughed in and glued up... The Mirror supports have been reinforced, everything sanded and plenty of holes drilled.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Sean Cunneen
Let Me Think
*****

Reged: 08/01/07

Loc: Blue Island Illinois
Re: My 16" f7.2 Newt project code named "Grace" new [Re: Sean Cunneen]
      #5885747 - 05/26/13 03:08 PM Attachment (14 downloads)

Here is the shot of the underside. I am looking for a third clamp knob, turns out the two I have are a weird size so the search is on for that one! I had to make a couple of trips to the hardware store to find stiff enough springs. The three I have now will provide a nice cushion for that big mirror!

Post Extras: Print Post   Remind Me!   Notify Moderator  
Sean Cunneen
Let Me Think
*****

Reged: 08/01/07

Loc: Blue Island Illinois
Re: My 16" f7.2 Newt project code named "Grace" new [Re: Sean Cunneen]
      #5885753 - 05/26/13 03:13 PM Attachment (15 downloads)

Next up is the framing of the lower OTA. Each pine panel is trimmed with 3/4' rounded red oak. I started with gluing in reinforcing strips of 2x2.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Sean Cunneen
Let Me Think
*****

Reged: 08/01/07

Loc: Blue Island Illinois
Re: My 16" f7.2 Newt project code named "Grace" new [Re: Sean Cunneen]
      #5885756 - 05/26/13 03:15 PM Attachment (15 downloads)

Then the first baffle is glued in with a partial assembly of the rest of the components to make sure the clearances are nice and tight. My daughter thought I was building her the castle she always wanted. I'll let her down easy when she turns 5.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Sean Cunneen
Let Me Think
*****

Reged: 08/01/07

Loc: Blue Island Illinois
Re: My 16" f7.2 Newt project code named "Grace" new [Re: Sean Cunneen]
      #5885759 - 05/26/13 03:16 PM Attachment (22 downloads)

A final shot of everything coming together.

Post Extras: Print Post   Remind Me!   Notify Moderator  
cpr1
professor emeritus
*****

Reged: 03/24/12

Loc: Louisiana
Re: My 16" f7.2 Newt project code named "Grace" new [Re: Sean Cunneen]
      #5885858 - 05/26/13 04:34 PM

It is really a joy watching you build this scope. Congrats on the progress, looks great. I will definitely follow your build progress. Thanks for posting.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Sean Cunneen
Let Me Think
*****

Reged: 08/01/07

Loc: Blue Island Illinois
Re: My 16" f7.2 Newt project code named "Grace" new [Re: cpr1]
      #5902852 - 06/04/13 10:47 PM

Thanks Christopher! It has been a fun build with some interesting challenges. Things are starting to work themselves out, so the build should progres fairly quickly in the next few weeks.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Sean Cunneen
Let Me Think
*****

Reged: 08/01/07

Loc: Blue Island Illinois
Re: My 16" f7.2 Newt project code named "Grace" new [Re: Sean Cunneen]
      #5902855 - 06/04/13 10:51 PM Attachment (15 downloads)

My youngest stayed home sick today so I snuck away for 20 minutes here and there to make some more progress. One gimmick I wanted to try out was a hinged mirror cell so that I can easily install the mirror when traveling. The mechanism is very simple, two carriage bolts through the side of the mirror box straight to the cell rails to act as hinges. Two small clamping knobs to hold the cell rails in the box. Here is the rail assembly getting the holes marked and drilled.

Edited by Sean Cunneen (06/04/13 10:52 PM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
Sean Cunneen
Let Me Think
*****

Reged: 08/01/07

Loc: Blue Island Illinois
Re: My 16" f7.2 Newt project code named "Grace" new [Re: Sean Cunneen]
      #5902860 - 06/04/13 10:53 PM Attachment (13 downloads)

Test fit...

Post Extras: Print Post   Remind Me!   Notify Moderator  
Sean Cunneen
Let Me Think
*****

Reged: 08/01/07

Loc: Blue Island Illinois
Re: My 16" f7.2 Newt project code named "Grace" new [Re: Sean Cunneen]
      #5902863 - 06/04/13 10:54 PM Attachment (11 downloads)

I made folding hangers for each side to hold the cell rails out of thin aluminum strips.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Sean Cunneen
Let Me Think
*****

Reged: 08/01/07

Loc: Blue Island Illinois
Re: My 16" f7.2 Newt project code named "Grace" new [Re: Sean Cunneen]
      #5902867 - 06/04/13 10:57 PM Attachment (14 downloads)

Each end was rounded and holes drilled. It took me a couple of iterations to figure out where the hangers would be mounted so they could move freely and fold up and out of the way. They ended up working out really well! I thought these would be much more finicky... Here the back end is just you know; hanging out...

Post Extras: Print Post   Remind Me!   Notify Moderator  
Sean Cunneen
Let Me Think
*****

Reged: 08/01/07

Loc: Blue Island Illinois
Re: My 16" f7.2 Newt project code named "Grace" new [Re: Sean Cunneen]
      #5902878 - 06/04/13 11:01 PM Attachment (13 downloads)

Another thing I wanted to try was to make the clamping knobs for the rails captive. I rummaged through the parts bin at the hardware store to find a couple of "E" clips that fit the 1/4-20 shaft(tip, they were NOT the 1/4' ones, go figure). I mounted a cutting wheel in my drill, slipped a washer on the knob shaft and ground down one turn of thread.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Sean Cunneen
Let Me Think
*****

Reged: 08/01/07

Loc: Blue Island Illinois
Re: My 16" f7.2 Newt project code named "Grace" new [Re: Sean Cunneen]
      #5902887 - 06/04/13 11:06 PM Attachment (18 downloads)

Whaddya'know, worked like a charm! The trick is to drill the hole for the shaft a size larger, in this case 5/16" so that the knob has plenty of wiggle room.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Sean Cunneen
Let Me Think
*****

Reged: 08/01/07

Loc: Blue Island Illinois
Re: My 16" f7.2 Newt project code named "Grace" new [Re: Sean Cunneen]
      #5902891 - 06/04/13 11:08 PM Attachment (18 downloads)

Here is a beauty shot right down the OTA

Post Extras: Print Post   Remind Me!   Notify Moderator  
Sean Cunneen
Let Me Think
*****

Reged: 08/01/07

Loc: Blue Island Illinois
Re: My 16" f7.2 Newt project code named "Grace" new [Re: Sean Cunneen]
      #5902901 - 06/04/13 11:12 PM Attachment (18 downloads)

I made one panel removeable via screws, the other three sides are glued in. That way I can get good access to add fans or anything else I need to do inside.

My last step of the night was to add some trim to the top. I'll use the coping saw to rough the corners and finish up with the belt sander.

Edited by Sean Cunneen (06/04/13 11:13 PM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | (show all)


Extra information
6 registered and 20 anonymous users are browsing this forum.

Moderator:  ausastronomer, richard7, Starman81 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 5808

Jump to

CN Forums Home


Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics