My new DOB design

[Anil (Anil)]

Hi all, i refurbished a old 6" telescope which was gathering dust at a school in Bangalore. Telescope mount is made of 19mm plywood. Base is attached with 3 wheels for smoother movement. Old paper mash tube was replaced with a 7" PVC tube. Here in this design mirror cell is modified with a 1400 grams counter weight to balance the scope. Helical focusser was machined to replace a cheap plastic one, finder scope was also developed from a aluminium ring, lot of work....took one month to complete the scope. There is no conventional cradle here, this is replaced with a 1 inch thick circular wooden blank attached to the tube. Optical performance is quite good. Lot of running around to get things done but i really enjoyed this project. After my DIY refractor building this is my second telescope making project in 14 months. More working pictures here at http://anilmn.blogspot.com/ (MY DIY PAGE)


Anil

[spacezebra (Petra)]

Excellent - how does the Helical work, I have never seen that before.

Cheers Petra d.

[mswhin63 (Malcolm)]

Nicely made, PVC would be interesting how well that goes with temperature variations. Love the Focuser design, onlu once moving parts heaps reliable.

[DavidU (Dave)]

Anil, very nice DIY work there ! Is there anything you can't do?
Well done.

[Anil (Anil)]

Thanks Petra, helical focusser works fine with zero image shift. As we do not get metal focusser here i replaced a fragile plastic rack & pinion with a machined aluminium one, works great!!!!


Regards,
Anil

Originally Posted by spacezebra

Excellent - how does the Helical work, I have never seen that before.

Cheers Petra d.

[Anil (Anil)]

Hi, pvc tube requires cooling time of 20 minutes.


Rgards,
Anil

Originally Posted by mswhin63

Nicely made, PVC would be interesting how well that goes with temperature variations. Love the Focuser design, onlu once moving parts heaps reliable.

[spacezebra (Petra)]

Hi Anil

I would be interested in the mechanics behind it, its really got me intrigued.

Cheers Petra d.

Originally Posted by Anil

Thanks Petra, helical focusser works fine with zero image shift. As we do not get metal focusser here i replaced a fragile plastic rack & pinion with a machined aluminium one, works great!!!!


Regards,
Anil

[scopemankit (Chris)]

Nice job! You must feel very proud!

[GrahamL]

Great work Anil

[Inmykombi (Geoff)]

Looks kinda space age.
Nice work there.

[astro_nutt]

Great work there!