#1  
Old 05-05-2011, 11:36 AM
Rick Parrott's Avatar
Rick Parrott
Dexdoggy

Rick Parrott is offline
 
Join Date: Jan 2007
Location: Milperra Australia
Posts: 124
Rotate the Tube?

Excuse Me Dumb!
After all these years of only occasional sky-watching, I am still wondering is there a "best" position (rotation) of my Newtonian in it's mount? I have not found an ideal tube position, nor really an ideal height for my EQ mount. Any "rule-of-thumb", or is it simply a fact of life that you need to play with this (depending on my looking south, north, up etc!)
Reply With Quote
  #2  
Old 05-05-2011, 01:01 PM
Brian W's Avatar
Brian W (Brian)
The Wanderer

Brian W is offline
 
Join Date: Jan 2008
Location: Dumaguete Philippines
Posts: 757
Fact of life is you need to play with it. One of the reasons dobsonian mounts really caught on was how easy they are to use.

However for a reasonable price you can find a set of rotating mounting rings that make moving the tube a lot easier.
Brian
Reply With Quote
  #3  
Old 05-05-2011, 01:33 PM
ZeroID's Avatar
ZeroID (Brent)
Lost in Space ....

ZeroID is offline
 
Join Date: May 2010
Location: Auckland, NZ
Posts: 4,949
I reckon you need a rotating neck sometimes ... !!!
Reply With Quote
  #4  
Old 07-05-2011, 02:22 AM
Waxing_Gibbous's Avatar
Waxing_Gibbous (Peter)
Grumpy Old Man-Child

Waxing_Gibbous is offline
 
Join Date: Jul 2009
Location: South Gippsland
Posts: 1,768
Brian's right. Get the rings that allow your tube to rotate.
A fixed Newt on a GEM will keep your Chiropractor in school fees forever!!
Reply With Quote
  #5  
Old 08-05-2011, 08:47 AM
OneOfOne's Avatar
OneOfOne (Trevor)
Meteor & fossil collector

OneOfOne is offline
 
Join Date: Jul 2005
Location: Bentleigh
Posts: 1,386
When I used to have a Newt mounted on a GEM I had exactly the same problems. The only "best" position I found was to have the eyepiece pointing straight out to the side when in the home position. This will usually ensure that the eyepiece won't point to the ground, but that is about it. In some positions you will still need a flip top head and others you will need to lean out over the top of the tube without moving it.

I found Antares (Canada?) make rings, but never got around to buying them. Excellent quality roller bearings, but not very cheap. Otherwise I have seen some DIY ideas using garden hose to hold the tube and something to loosen it. Whatever ideas you try, you would need to make sure the tube doesn't slide out!
Reply With Quote
  #6  
Old 08-05-2011, 09:24 AM
RobF's Avatar
RobF (Rob)
Mostly harmless...

RobF is offline
 
Join Date: Jul 2008
Location: Brisbane, Australia
Posts: 5,735
Another thought - do a Google on "Wilcox rings"....
Reply With Quote
  #7  
Old 09-05-2011, 08:31 AM
Rick Parrott's Avatar
Rick Parrott
Dexdoggy

Rick Parrott is offline
 
Join Date: Jan 2007
Location: Milperra Australia
Posts: 124
Quote:
Originally Posted by OneOfOne View Post
The only "best" position I found was to have the eyepiece pointing straight out to the side when in the home position.
Thankyou all, I will give the rings a look! Another dumb question... what is "home" position?
Reply With Quote
  #8  
Old 09-05-2011, 08:55 AM
multiweb's Avatar
multiweb (Marc)
ze frogginator

multiweb is offline
 
Join Date: Oct 2007
Location: Sydney
Posts: 22,079
A 90 degrees diagonal will help in any position. The real neck killer is an SCT, not a newt IMO.
Reply With Quote
  #9  
Old 09-05-2011, 09:41 AM
erick's Avatar
erick (Eric)
Starcatcher

erick is offline
 
Join Date: Dec 2006
Location: Gerringong
Posts: 8,548
Here is an idea - see attached.

This is from Astronomy Technology Today - a great online magazine. See here:-

https://www.astronomytechnologytoday.com/Default.asp
Attached Files
File Type: pdf ATT tip - tube rotation.pdf (125.7 KB, 20 views)
Reply With Quote
  #10  
Old 09-05-2011, 11:00 AM
Jules76's Avatar
Jules76 (Julian)
I just point it at stuff

Jules76 is offline
 
Join Date: May 2009
Location: Brisbane, Australia
Posts: 303
When I get around to it, I'm planning to try out this solution by Astro Baby. Looks pretty good and is much cheaper solution.

http://www.astro-baby.com/articles/r...%20Project.htm
Reply With Quote
  #11  
Old 09-05-2011, 11:04 AM
supernova1965's Avatar
supernova1965 (Warren)
Buddhist Astronomer

supernova1965 is offline
 
Join Date: Aug 2009
Location: Phillip Island,VIC, Australia
Posts: 4,073
Quote:
Originally Posted by Rick Parrott View Post
Thankyou all, I will give the rings a look! Another dumb question... what is "home" position?
This pic shows home position
Attached Thumbnails
Click for full-size image (SkyViewProMount285330.jpg)
22.1 KB8 views
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 07:19 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement