Go Back   IceInSpace > Equipment > Equipment Discussions

Reply
 
Thread Tools Rate Thread
  #1  
Old 07-09-2020, 12:54 PM
DRCORTEX (Lance)
Neo - as in Dr Neo Cortex

DRCORTEX is offline
 
Join Date: Dec 2005
Location: Mt Druitt
Posts: 177
CGX EQ - Balance Southern Hemisphere

Hi There,

Finally have moved from ALT/AZ to EQ, essentially for better tracking with imaging.

My understanding is to use our version of the south polar star for allignment, but what interests me, is whether the mount should be balanced "east or west" heavy ?

For northern hemisphere, I understand it is east, would it not be slightly balanced to the west for southern users ?

Cheers,

Lance
Reply With Quote
  #2  
Old 07-09-2020, 01:09 PM
that_guy's Avatar
that_guy (Tony)
Local Korean Millennial

that_guy is offline
 
Join Date: Dec 2009
Location: Charleville
Posts: 2,041
I believe the CGX is a belt system which usually means it should be balanced on both sides. Should be no bias in either direction.
Reply With Quote
  #3  
Old 07-09-2020, 02:51 PM
Merlin66's Avatar
Merlin66 (Ken)
Spectroscopy Wizard

Merlin66 is offline
 
Join Date: Oct 2005
Location: St Leonards, Vic
Posts: 7,837
Lance,
If it does need a slight "imbalance" to reduce slop then slightly load it up on the East.
This means that the RA drive is always driving against a load and any backlash is reduced.
Reply With Quote
  #4  
Old 07-09-2020, 03:46 PM
glend (Glen)
Registered User

glend is offline
 
Join Date: Jun 2013
Location: Lake Macquarie
Posts: 5,950
I have a CGX, on a pier in my observatory, and yes it is a belt driven mount with spring loaded worms, so it is not as sloppy as some of the gear driven mounts. That said I do still run just a tad of east heavy balance, probably more out of old habit than pure necessity. For visual use i would not worry about it at all, but if your imaging with guiding, sure. Be aware that the CGX can image across the Meridian by 20, and is usually ok through that process, at least in my experience. If your imaging with scopes which exhibit mirror flop then you will need to 'supervise' at the Meridian.
Reply With Quote
  #5  
Old 07-09-2020, 03:50 PM
LewisM's Avatar
LewisM
Novichok test rabbit

LewisM is offline
 
Join Date: Aug 2012
Location: Somewhere in the cosmos...
Posts: 9,940
As the old saying goes :
Scope on the east, counterweights least. Scope on the west, counterweights best
Reply With Quote
  #6  
Old 07-09-2020, 04:49 PM
DRCORTEX (Lance)
Neo - as in Dr Neo Cortex

DRCORTEX is offline
 
Join Date: Dec 2005
Location: Mt Druitt
Posts: 177
Quote:
Originally Posted by that_guy View Post
I believe the CGX is a belt system which usually means it should be balanced on both sides. Should be no bias in either direction.
Who mentioned CGX in the post ? How are you aware I was going to use a CGX
Reply With Quote
  #7  
Old 07-09-2020, 04:52 PM
DRCORTEX (Lance)
Neo - as in Dr Neo Cortex

DRCORTEX is offline
 
Join Date: Dec 2005
Location: Mt Druitt
Posts: 177
Quote:
Originally Posted by that_guy View Post
I believe the CGX is a belt system which usually means it should be balanced on both sides. Should be no bias in either direction.
Don't worry about me - I'm an idiot, it was in the header - lol
Reply With Quote
  #8  
Old 07-09-2020, 05:01 PM
DRCORTEX (Lance)
Neo - as in Dr Neo Cortex

DRCORTEX is offline
 
Join Date: Dec 2005
Location: Mt Druitt
Posts: 177
Quote:
Originally Posted by glend View Post
I have a CGX, on a pier in my observatory, and yes it is a belt driven mount with spring loaded worms, so it is not as sloppy as some of the gear driven mounts. That said I do still run just a tad of east heavy balance, probably more out of old habit than pure necessity. For visual use i would not worry about it at all, but if your imaging with guiding, sure. Be aware that the CGX can image across the Meridian by 20, and is usually ok through that process, at least in my experience. If your imaging with scopes which exhibit mirror flop then you will need to 'supervise' at the Meridian.
Thanks,

How much is a "tad" aka, if balanced, just that 20mm or so to the east ? Based on weight, the 800 will be around 10 kilo fully loaded, with cameras, starsense, etc. I decided to go with an OAG for F/6.3, F/10, and a tube mounted ZWO mini guide for F/2 with Hyperstar. Based on the CGX capacity of 20+ kg, I am well under 50% capacity.

I wanted the CGX for future upgrades - IF I can afford when I retire to that deep dark place.

Cheers,

Lance
Reply With Quote
  #9  
Old 07-09-2020, 09:40 PM
glend (Glen)
Registered User

glend is offline
 
Join Date: Jun 2013
Location: Lake Macquarie
Posts: 5,950
Lance, I thought I said 20 degrees past the Meridian, not 20mm.
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 02:24 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Advertisement
NexDome Observatories
Advertisement
Limpet Controller
Advertisement
Bintel
Advertisement
Testar
Advertisement
Astronomy and Electronics Centre
Advertisement