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#1426 1000mmFL

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Posted 20 October 2019 - 09:47 AM

If you ever visit Florence make time to see the Museo Galileo.

 

...

The lower telescope in the middle picture is the one that I based mine on. This was primarily because the dimensions and lenses were suitable to making a replica. The longer one has a 1330mm FL and I couldn't find a lens that was close to that. (The shorter one has a 980mm FL and 1000mm FLs are available). At nearly 1.5m length it's also a bit unwieldy.

 

The literature suggests that the upper scope was a research tool and may be the one he used to make observations for Siderius Nuncius since it is dated to 1609. The lower one is dated 1610 and is clearly a fancy version (leather wrapped with decorations). He may have sold some of the fancy ones and presented them to influential people to convince them of the validity of his work.


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#1427 nstiesi

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Posted 22 October 2019 - 06:29 AM

4" f/10 made for my son, officially complete. Tube is a 6" cardboard shipping tube rescued from the trash, covered on fabric and soaked in shellac.

Focuser is 3d printed hralocal crayford (inspired by Pierre lemay). Spider, mirror cell, and tube end rings also printed.

Mount is made from leftover cabinet plywood, 1/2".

Wrist weights for balance. Kept as low to ground as possible so my son doesn't need a step stool. Although it might need a platform as he grows up...d0ae4b487c3b9c511f943858be2fc84b.jpgc4408e257acf18a6b7bbb576dc662fc9.jpg

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#1428 Vesper818

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Posted 03 November 2019 - 10:00 PM

The lower telescope in the middle picture is the one that I based mine on. This was primarily because the dimensions and lenses were suitable to making a replica. The longer one has a 1330mm FL and I couldn't find a lens that was close to that. (The shorter one has a 980mm FL and 1000mm FLs are available). At nearly 1.5m length it's also a bit unwieldy.

The literature suggests that the upper scope was a research tool and may be the one he used to make observations for Siderius Nuncius since it is dated to 1609. The lower one is dated 1610 and is clearly a fancy version (leather wrapped with decorations). He may have sold some of the fancy ones and presented them to influential people to convince them of the validity of his work.



Here's a link in Classics, to my version of the Galileian fancy scope, including source for lenses used.
https://www.cloudyni...e/?fromsearch=1
Still working on mount.
Also found a 1300mm fl singlet to try the "workhorse" version, but have not tested it yet.

#1429 halx

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Posted 03 November 2019 - 11:34 PM

d0ae4b487c3b9c511f943858be2fc84b.jpg

Looks awesome! Congrats!

Any chance you have your 3D designs published already?
We are sharing our 3dp thingies primarily on this thread: https://www.cloudyni...int-3d-that-is/


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#1430 nstiesi

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Posted 04 November 2019 - 07:32 AM

Looks awesome! Congrats!

Any chance you have your 3D designs published already?
We are sharing our 3dp thingies primarily on this thread: https://www.cloudyni...int-3d-that-is/

No, I havent.....but if anyone is interested I would be happy to do so.


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#1431 Lister85

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Posted 07 November 2019 - 08:11 AM

I didn’t build this, I managed to win it in an estate sale auction. Whoever built this did a beautiful job. However, I’d like to eventually make this 14” beast a truss tube design. Any and all advice is welcome!

 

fc70e1cf40ebdd36d9b81245fef741b8.jpg


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Edited by Lister85, 07 November 2019 - 09:08 AM.

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#1432 Pinbout

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Posted 08 November 2019 - 08:07 PM

I didn’t build this, I managed to win it in an estate sale auction. Whoever built this did a beautiful job. However, I’d like to eventually make this 14” beast a truss tube design. Any and all advice is welcome!

 

fc70e1cf40ebdd36d9b81245fef741b8.jpg


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Learn sketchup and scale this down to a 14”

 

 

https://3dwarehouse....8d444821f22cd11


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#1433 MGAR

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Posted 27 November 2019 - 02:03 PM

I needed a finder scope for my 6 inch reflector. I picked up a used doublet 63mm objective lens from Surplus Shed. Took a empty Suave shampoo bottle, canning jar lid and some window weather insulation tape to hold the lens in place. I felt like I was in a field of flowers putting it together, the leftover fragrance from the shampoo was a little overwhelming.  

 

This makes for a good finder and a nice little spotting scope. 

 

63mm_finder_1.jpg

 

Cheers!

Gary


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#1434 jtsenghas

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Posted 27 November 2019 - 04:14 PM

...Took a empty Suave shampoo bottle, canning jar lid and some window weather insulation tape to hold the lens in place...


Did you do anything to flock or baffle that?

Edited by jtsenghas, 27 November 2019 - 04:14 PM.


#1435 MGAR

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Posted 27 November 2019 - 06:17 PM

Did you do anything to flock or baffle that?

My picture must make the finder look bigger than actual size, the FL is 260mm. When doing a rough sketch of the optical light path it didn't make sense to baffle the very edge, the canning jar lid kind of takes care of that.

 

At some point I might paint it black for flocking but would contrast the look of my 6" F4 comet hunter. ;-)

 

Atlanta_comet_hunter.jpg

 

Gary 


Edited by MGAR, 27 November 2019 - 07:12 PM.

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#1436 roscoe

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Posted 28 November 2019 - 08:52 AM

I needed a finder scope for my 6 inch reflector. I picked up a used doublet 63mm objective lens from Surplus Shed. Took a empty Suave shampoo bottle, canning jar lid and some window weather insulation tape to hold the lens in place. I felt like I was in a field of flowers putting it together, the leftover fragrance from the shampoo was a little overwhelming.  

 

This makes for a good finder and a nice little spotting scope. 

 

attachicon.gif 63mm_finder_1.jpg

 

Cheers!

Gary

similar construction for my finder..... i used a used auto AC recharge can for mine.  fit perfect.



#1437 mfoose

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Posted 02 December 2019 - 02:01 PM

This post has been almost two years in the making as I started this build in January 2017. Since I began this hobby and read about Dobson, I wanted to build one of my own. This is my first Dob and hopefully not my last. I plan to give this scope its own thread because I have learned a lot (mostly from mistakes) and would like to encourage others, but right now just a brief write-up and a picture from moments after finishing the mount in my friend's woodshop. 

 

It's a 10" f/6 Dob. The mirror is a NOS full thickness poured Pyrex mirror, the tube is a heavy duty kraft paper tube from Yazoo Mills, and the Dob mount is 3/4" Baltic Birch. I am yet to have first light with it, but hopefully I will in a few days when the weather clears. The last thing I have to do is install a system of fans to help with cool down and keeping the mirror at ambient temperature, but it is fully operational without them. 

 

Hoping for a clear night soon!

Attached Thumbnails

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Edited by mfoose, 02 December 2019 - 02:04 PM.

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#1438 roscoe

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Posted 02 December 2019 - 03:35 PM

looks like a real dob!

looks like a real woodworking shop, too.


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#1439 Chucky

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Posted 02 December 2019 - 03:44 PM

Nice looking 10 F6 mfoose.  I hope you have many great memories with this scope.

 

From one 10 F6er to another.  Built mine in 1999.  Zambuto primary.

 

 

Attached Thumbnails

  • 10 Dob.jpg

Edited by Chucky, 02 December 2019 - 03:46 PM.

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#1440 roscoe

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Posted 02 December 2019 - 04:07 PM

I like your chart-holder table!



#1441 Chucky

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Posted 03 December 2019 - 02:57 PM

<<  I like your chart-holder table!  >>  Thank you roscoe.

 

I sometimes move my Nexus DSC to that holder table.  Either way, it's nice to have the table at the perfect height for observing.



#1442 jessebear

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Posted 04 December 2019 - 11:12 AM

None of these are 'quality', but they work and I've had fun building them.

 

-F11.6 and F15 (both 60mm) from spare bits and 3D printed parts. Both are baffled and flocked.
OkjeIWs.jpg
TBsQrMK.jpg

 

-F5.6 RFT (old Zeiss copier lens), more spare bits and 3D printed parts. Also baffled and flocked, though there was only room for one tube baffle. Still needs work and weighs a ton.
BwTxsjt.jpg
l2bnpn6.jpg

 

-'Vixen' style photo tripod mount.
vfWVbmI.jpg
O5ekei8.jpg

 

I'm also working on an 8" dob using components from a trashed tube C8N that my neighbor very generously gave to me (that's where the RFT focuser came from since I'd like to mount a dual speed on the dob). I'm hoping to use mostly 80/20 aluminum extrusions and 3D printed parts. Maybe will try to make the mount go-to with Onstep and stepper motors if I have time. Second kid is on the way though so that one might take a while!


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#1443 Quinnipiac Monster

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Posted 08 December 2019 - 07:19 AM

If you ever visit Florence make time to see the Museo Galileo.

Yep, absolutely worth it! My wife designed the 18th-century electricity room.


Edited by Quinnipiac Monster, 08 December 2019 - 07:19 AM.


#1444 icomet

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Posted 14 December 2019 - 06:27 PM

Here's my "anti-refractor" that I put together.

 

6" f/10  "Ed Beck" mirror with a 1" Antares secondary, Astrosystem spider and a custom secondary. Uses a Moonlite 

focuser.

 

Sits on an old CG-5 mount that had to be brought back to life (thought it was the "inherently bad switch", but a diode),

with a set of rings that are lined with belting to take up the slack and strips of a "white cutting board" for slip to be used

with the "Wilcox ring" setup.

 

Has two 80mm fans behind the primary mirror at the edge to "move" air from primary and it

does reach up to the secondary, also.

 

The mirror cell is going to be replaced with the one seen in the photo, after the rebuild/painting. Old Cave cell, if I remember

correctly.

 

Clear Skies.

Attached Thumbnails

  • 6 inch sm.jpg
  • secondary mirrors sm.jpg
  • 6 inch Cave cell.jpg

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#1445 petertinkerer

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Posted 23 December 2019 - 10:06 PM

Here are some pictures of my 6 inch F8 Dual Newtonian Offset Binoscope I have just completed. Nearly all the mechanical parts are 3D printed.

 

I have always been so pleased with the views of my old trusty 6" F8 scope made over 30 years ago that I decided to make this Dual Newtonian Offset Binoscope.  The 46mm of lateral offset between the individual scope axes provides for a very comfortable viewing  position with the angled eyepieces.  The angle the eyepieces make with the binoscope axis changes from about 55 degrees with an  IPD of 55mm to 40 degrees when the IPD is opened up to 75mm.  These angles  all result in a comfortable viewing position from horizon to zenith.  As can be seen in the 3rd photo there are conveniently located push buttons for the motorized  X-Y convergence of the images and the lower buttons are for changing the motorized IPD from 55mm to 75mm.  What has made this a practical design is the advent of inexpensive 3D printers.  There are 20 individual 3D printed parts used in the construction of the binoscope and 12 lengths of aluminum angle.  The cost breakdown is as follows:

 

2X6" F8 mirrors                                              $260

1X 31mm secondary mirror                            $40

1X 46mm secondary mirror                            $50

2X Focusers                                                    $70

12 lengths of 3/4 inch aluminum angle           $75

20 3D printed parts (Cost of the PETG plastic)         $50 (you need to have a $400 3D Printer)

 

Corrugated plastic Light Covers                    $25

 

3 Motors for X-Y image and IPD adjustment $40

 

Miscellaneous screws and glue etc                $50

 

Eyepiece cost not included, but two  inexpensive plossls work well  with the long focal length.

 

First light for this Binoscope was only yesterday but already I'm excited by the clean, crisp views with no CA and a useful magnification range from 38X with 32mm Plossls to 305X with 10mm Plossls and 2.5X Barlows.

 

I will be providing the .STL files of all the 3D  printed parts on Thingiverse along with construction details on petertinkerer.com for anyone interested in building one of these binoscopes. 

 

The weight of the binoscope is 25 pounds with eyepieces and the classic Dobsonian mount weighs 20 pounds so they balance each other and can easily be carried together.

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#1446 cmooney91

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Posted 24 December 2019 - 07:28 AM

Peter your advancements in innovative 3D printed binoscope designs never cease to amaze!

 

I hope to see this one at Stellafane.

 

-Corey


Edited by cmooney91, 24 December 2019 - 07:28 AM.


#1447 Other_Mike

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Posted 17 January 2020 - 07:59 PM

I can finally post in this thread! 16" f/4.4, and I'm naming it Lyra. The previous incarnation was a Meade Starfinder I bought from a member of my local club. I mostly followed Kriege and Berry's book, but deviated in a few places. Total build time was about five months. First light will be whenever these blasted clouds go away - I've had three clear nights since November 20th, and two were holidays.

 

Still lots of tweaking to do. Next steps are to finish building and installing eyepiece and accessory trays, a cupholder, and wiring management for dew heaters.

Attached Thumbnails

  • 82515463_10104248892776808_2780774973772398592_o.jpg

Edited by Other_Mike, 17 January 2020 - 08:17 PM.

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#1448 Stipe Vladova

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Posted 19 January 2020 - 05:28 PM

This is my last made Carton 60/1000 "the toothpick". Only the lens is original and bought from Sheldon. All other parts are homemade out of machined aluminum stock parts. Gives superb images which remember me at times when looked thru Zeiss Telementor. Very happy with it. 

Attached Thumbnails

  • 1579472565666-1280x960.jpg

Edited by Stipe Vladova, 19 January 2020 - 05:41 PM.

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#1449 Augustus

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Posted 23 January 2020 - 11:01 PM

I consider this "done" at this stage of the game, apart from lacking interior paint/flocking or a finder. 10" f/3.2 with a primary by Logan Nicholson, 3.1" Antares secondary on a Novak spider, Moonlite focuser, custom CNC'ed mirror cell, Hastings tube. Wasn't really happy with my DobStuff build for this due to stray light/balance/ergonomic issues so I decided to put the thing in a solid tube on a GEM and maybe I'll build a Dob mount for the OTA sometime. 

 

I have the scope on an AVX owned by a club I'm in for testing until my own CG-5 ASGT arrives. 

 

mounted1.JPG

 

mounted2.JPG


Edited by Augustus, 23 January 2020 - 11:01 PM.

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#1450 Chuck Hards

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Posted 23 January 2020 - 11:40 PM

Very nice!  Fastest I ever built was an 8" f/3.75 about 30 years ago.  


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