Jump to content


Photo

Dec balance precise adjustment

balance adjustment

  • Please log in to reply
7 replies to this topic

#1 RamaSpaceShip

RamaSpaceShip

    Member

  • Members
  • 165 posts
  • LocationIn the forest near Bordeaux, France

Posted 26 February 2014 - 11:37 PM

Hi all,

 

I would like to share with you the mean I use to easily adjust the balance on the Dec axis. I have made a modification to the dovetail so that I just have to turn a knob to precisely adjust the balance. I needed to use a PTFE spray so that the dovetail slides without effort.

 

The image of this system is attached here:

Attached File  Dec_Balance_Adjust.jpg   269.41KB   18 downloads

 

This is not patented and I strongly invite ASA to improve this design and add this very useful feature.

 

Regards.

 

Bernard

 



#2 lukepower

lukepower

    Member

  • Beta Tester
  • 610 posts
  • LocationDolomites, Italy

Posted 27 February 2014 - 11:54 AM

Hi Bernard,

 

I have ordered a similar system for my scope, your solution looks good! Will definitively be an improvement :)


Lukas Demetz
------------
www.skygemsobservatories.com
Astro Dolomites Observatory, Skygems Network
Santa Cristina Valgardena, Italy
20" Cassegrain-Newton on ASA DDM85XL


#3 prefetch

prefetch

    Member

  • Beta Tester
  • 106 posts
  • LocationSalt Lake City, Utah

Posted 17 March 2014 - 05:24 AM

it's difficult for me to understand exactly what is pictured.

 

could you describe what it does and how?



#4 Waldemar

Waldemar

    Member

  • Beta Tester
  • 236 posts
  • LocationNetherlands

Posted 17 March 2014 - 07:25 AM

Lukas, could you provide us with a link to your system?

Thanks in advance,

Waldemar


Waldemar
--------------
Mount: DDM85 Standard 12V ; Telescopes: TEC140 + 140FF + Quad TCC ; Celestron RASA; TMB 92SS + 27TVPH Cameras: ZWO ASI 174MM cool; SBIG STF8300M; ATIK4120EX; TRIUS SX-36
Filters: Astronomik and Baader NB + RGB; Lunt double stack 75 mm unobstructed signature series + BF 3400; Dutch weather and light polluted skies.  

#5 lukepower

lukepower

    Member

  • Beta Tester
  • 610 posts
  • LocationDolomites, Italy

Posted 17 March 2014 - 11:30 AM

Hi Waldemar,

 

I am still waiting it to be shipped from Michael Knopf. As soon as it's mounted I'll post some pictures. Anyway, the basic idea is to be able to move the plate on the mount by turning a knob :)


Lukas Demetz
------------
www.skygemsobservatories.com
Astro Dolomites Observatory, Skygems Network
Santa Cristina Valgardena, Italy
20" Cassegrain-Newton on ASA DDM85XL


#6 nakbrooks

nakbrooks

    Member

  • Beta Tester
  • 268 posts
  • LocationWiltshire (England) & Hautes-Pyrenees (France)

Posted 17 March 2014 - 12:27 PM

Out of interest I use this http://admaccessorie..._Max_Guider.htm to piggyback my secondary OTA (125mm Hutech/Borg) on my primary OTA (ASA 16" Cassegrain). It allows easy but secure adjustment on all axes both for balance and co-alignment with the primary.

I would not suggest it for attaching a heavy primary OTA to the mount though. Even though it is very solidly built it would introduce unnecessary potential for flexure.

Nigel

Edited by nakbrooks, 17 March 2014 - 12:27 PM.

Nigel Brooks
Stratis Observatory, Hautes Pyrénées, France.
http://www.facebook.com/stratisobservatory

#7 RamaSpaceShip

RamaSpaceShip

    Member

  • Members
  • 165 posts
  • LocationIn the forest near Bordeaux, France

Posted 17 March 2014 - 07:59 PM

it's difficult for me to understand exactly what is pictured.

 

could you describe what it does and how?

 

May-be this diagram will be clearer

Attached File  Dovetail_adjust.png   5.2KB   25 downloads

 

Turning the green knob causes the threaded bar to push or pull the dovetail.

 

 

Best regards.

 

Bernard



#8 prefetch

prefetch

    Member

  • Beta Tester
  • 106 posts
  • LocationSalt Lake City, Utah

Posted 17 March 2014 - 11:09 PM

May-be this diagram will be clearer

attachicon.gifDovetail_adjust.png

 

ah - perfect.  thanks.  now i see.  very cool system.






0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users