Page 3 of 3 FirstFirst 123
Results 21 to 29 of 29
Like Tree5Likes

Thread: Balancing A German Equatorial Mount

  1. #21
    AlanP's Avatar
    AlanP is offline SUPER GIANT
    Points: 35,809, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    First 1000 Experience Points365 Days+ Registered Achievement!750 Days+ Registered Achievement!1000 Days+ Registered Achievement!3 Years + Achievement
    Join Date
    Jun 2009
    Location
    Howell, Michigan. Pardee Lake swamp area frontage.
    Posts
    1,235
    Points
    35,809
    Level
    100
    Thanks
    113
    Thanked 846x 403 Posts

    Default



    Step one- I lay the Scopes horizontal and check for pivot of the shaft. I then lay it 180d horizontal and again check for pivot.

    Step two- Set the Scopes central, pointed forward. I check for even movement clockwise and counter clockwise. Some balance it done by moving the Scope Pack towards a side, and some is made by moving the piggyback scopes forward or rearward.

    Step three- Lay the Scopes horizontal and check for rotation up/down around central axis. Repeat at 180 degrees.

    Step four- Recheck steps one through three to verify that balance adjustments did not affect a Step Balance.

    The Plan- I accept a slight imbalance. I accept a tendancy to swing the Cameras reward, and for the central pivot to rotate the counterweights downward, thereby pivoting the Camera Pack up. If something goes wrong, I want the Scope/Camera moving slowly up [very slowly], not down.

    This allows the Scope Pack to move allot of weight for slews, even at -5F readings, without loading up in any direction. AlanP

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Officina Stellare Veloce 200mm f/3 Riccardi Honders, AT10RC at f/5.4, Vixen DED 108SS f/5 Refractor, AP1200GTO Mount, ATS Tripod, 8' ExploraDome. AP Mach1 Mount, AP Eagle Tripod at Cottage SkyShed POD. Cottage Scopes; GSO 12" carbon fiber tube RC at f/6.05, Officina Stellare Veloce 200mm F/3 Riccardi Honders, AT8RC, ARO 150mm f10 Mak, Orion Optics UK OMC140DL Mak, (3) Celestron C5 f/6 SCTs. Cameras: (2) SBig ST-4000XCM, SBig ST-4000XM [mono], SBig STL-4020M, QSI 540wsg-8, QSI 683ws-8, QSI 583wsg, Apogee Alta U8300M, Atik 450C, Starlight Xpress SXV_M8C on C6 SCT Hyperstar. Webpage: Mystarrynight[dot]Info

  2. The Following User Says Thank You to AlanP For This Useful Post:

    astro_dude (12-24-2012)

  3. #22
    evanapp's Avatar
    evanapp is offline White Dwarf
    Points: 3,064, Level: 36
    Level completed: 10%, Points required for next Level: 136
    Overall activity: 0%
    Achievements:
    365 Days+ Registered Achievement!750 Days+ Registered Achievement!First 1000 Experience Points2 Posts Achievement20 Posts Achievement!
    Join Date
    Oct 2010
    Location
    KENSINGTON, CA USA
    Posts
    18
    Points
    3,064
    Level
    36
    Thanks
    1
    Thanked 2x 2 Posts

    Default Axial imbalance

    That's what I would call what we've been talking about here. It seems to be rarely, if ever, mentioned in most guidance on balancing procedure. Such imbalance makes the tube want to rotate in its rings, and since it can't do that, it does other undesirable things. Evan

  4. #23
    Gadget63's Avatar
    Gadget63 is offline SUPER GIANT
    Points: 11,551, Level: 74
    Level completed: 34%, Points required for next Level: 199
    Overall activity: 0%
    Achievements:
    50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!First 1000 Experience Points400+ Posts Achievement
    Join Date
    Jan 2012
    Location
    Fair Play, SC, or wherever our RV takes us
    Posts
    904
    Points
    11,551
    Level
    74
    Thanks
    100
    Thanked 166x 144 Posts

    Default

    Great tutorial! Thank you for this. Now I can't wait for my mount to get here!

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    8 SE, Heavy Duty EQ Wedge, Celestron 8mm-24mm zoom
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , Celestron eyepiece/filter accessory kit, Celestron power tank, Telrad, Nikon D80
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    camera with T-adapter and
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , Celestron 80mm guide
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , Celestron Neximage, Celestron Nexguide, Celestron CGEM-DX EQ mount!

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  5. #24
    pkrallis's Avatar
    pkrallis is offline White Dwarf
    Points: 6,177, Level: 54
    Level completed: 14%, Points required for next Level: 173
    Overall activity: 0%
    Achievements:
    365 Days+ Registered Achievement!5 Threads Achievement!2 Posts Achievement750 Days+ Registered Achievement!First 1000 Experience Points
    Join Date
    Jun 2011
    Location
    Colorado Springs
    Posts
    7
    Points
    6,177
    Level
    54
    Thanks
    3
    Thanked 0x 0 Posts

    Default Balancing with a side by side set up

    This system worked great for me until I started using a side by side for my guide scope. If I center the two scopes my "go tos" are always off and if I center the C-11 the balance is off. Is there a compromise? If not, how bad is the west side unbalance to the mount? All thoughts on the subject welcome.

    Thanks,

    peter...

  6. #25
    satcomsta's Avatar
    satcomsta is offline SUPER GIANT
    Points: 10,835, Level: 71
    Level completed: 95%, Points required for next Level: 15
    Overall activity: 0%
    Achievements:
    365 Days+ Registered Achievement!50 Posts Achievement!200+ Posts Achievement!First 1000 Experience Points2 Posts Achievement
    Join Date
    Oct 2011
    Location
    California
    Posts
    618
    Points
    10,835
    Level
    71
    Thanks
    101
    Thanked 151x 126 Posts

    Default

    Great tips for accomplishing a perfect balance, thank you!
    Lunt LS80T, Meade LXD75, C8 Advance VX, C8 on CGEM, WO Megrez 90mm, Celestron CG5ASGT,William Optics 71MM refractor. Celestron Sky Master,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ST80, Orion Starshoot G3 DSCC, Orion SAG Camera, Canon 60D, Canon RebelT5i
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , Canon Rebel XS, William Optics
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , Barska 20X60mm Spoting scope,
    , Lunt ZOOM EP 7,2MM - 21,5MMES 70° 35mm EP, OPT 40mmEP, ES 68° 35mm Argon Purged WP EP,Orion 12.5mm ICEP,Celestron 8-24MM EP, Lumicon OIII 496, OIII 501, H Alpha 656, H Beta 486 filters, Astronomik 1.25 CLS LP filter

  7. #26
    Spanishfly's Avatar
    Spanishfly is offline White Dwarf
    Points: 2,299, Level: 30
    Level completed: 99%, Points required for next Level: 1
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!365 Days+ Registered Achievement!First 1000 Experience Points
    Join Date
    Sep 2012
    Location
    Spain
    Posts
    45
    Points
    2,299
    Level
    30
    Thanks
    0
    Thanked 5x 3 Posts

    Default Re: Balancing A German Equatorial Mount

    Every Chinese-made equatorial mount I have bought (which is all of them) has been initially filled with some incredibly viscous glop which is more akin to adhesive than lubricant. This makes it utterly impossible to achieve any kind of accurate balance. With my SV102ED on my current EQ5 mount and using one of the supplied balance weights, the weight could be placed anywhere on the balance arm and the scope and arm would not move!!
    Claning out the gunk and regreasing with a general purpose lithium grease has transformed the mount completely. As well as being so much more pleasant to use, you can achieve an accurate balance.

  8. The Following 3 Users Say Thank You to Spanishfly For This Useful Post:

    astro_dude (12-24-2012),Briddie (01-20-2013),CeSinge (12-25-2014)

  9. #27
    Rick M.'s Avatar
    Rick M. is offline White Dwarf
    Points: 544, Level: 10
    Level completed: 88%, Points required for next Level: 6
    Overall activity: 0%
    Achievements:
    2 Posts Achievement5 Threads Achievement!20 Posts Achievement!50 Posts Achievement!
    Join Date
    Mar 2013
    Location
    Prince Edward Island, Canada
    Posts
    41
    Points
    544
    Level
    10
    Thanks
    0
    Thanked 0x 0 Posts

    Default Re: Balancing A German Equatorial Mount

    I have a new CGEM 9.25 Edge. I only have one eyepiece a 16.9 oz. 23mm. that comes with the scope. I have balanced the mount in R.A. and in Dec. However, I have 2 more eyepieces on order, and 11mm. weighing 10 oz. and a 30mm. weighing 34 oz. Will I have to balance
    in Declination every time I change eyepieces? I'm concerned about the 24 oz. difference between the lightest and heaviest eyepiece (not to mention the 2" 2X Powermate I have bought. I'm confused. Also, I cannot put in the rear safety screw on the dovetail bar as I have had to move the scope forward a ways to get balance with the 16.9 oz. eyepiece and the screw hole is out of sight. I assume this doesn't matter as the mounting screws on the side of the mounting platform are tight.

    Rick

  10. #28
    CeSinge's Avatar
    CeSinge is offline White Dwarf
    Points: 314, Level: 6
    Level completed: 28%, Points required for next Level: 36
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!
    Join Date
    Oct 2014
    Location
    Brussels
    Posts
    12
    Points
    314
    Level
    6
    Thanks
    12
    Thanked 1 Time in 1 Post

    Default Re: Balancing A German Equatorial Mount

    Quote Originally Posted by Spanishfly View Post
    Every Chinese-made equatorial mount I have bought (which is all of them) has been initially filled with some incredibly viscous glop which is more akin to adhesive than lubricant. This makes it utterly impossible to achieve any kind of accurate balance.
    Cleaning out the gunk and regreasing with a general purpose lithium grease has transformed the mount completely.
    Thank you to the OP for this interesting post.
    Spanishfly, when reading you, I am wondering how freely a scope should be able to turn on both axes? In my case, it's kind of stiff: when I push the scope, I have to continue pushing for it to move; when I stop pushing, it stops rotating on its axis within 1 or 2 inches. Normal? Or should I indeed try and lubricate or grease it?
    Can someone give me a sense of how freely it is supposed to rotate (when unblocked, obviously)?
    Newbie ;-) CELESTRON Astromaster 130EQ

  11. #29
    AustinPSD's Avatar
    AustinPSD is offline Super Moderator
    Points: 56,828, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 2.0%
    Achievements:
    200+ Posts Achievement!First 1000 Experience PointsGot three Friends20+ Friends Achievement!5+ Referrals Achievement!
    Join Date
    Sep 2009
    Location
    McDonald Observatory, Mt. Locke
    Posts
    6,921
    Points
    56,828
    Level
    100
    Thanks
    743
    Thanked 5,863x 3,113 Posts
    Blog Entries
    1

    Default Re: Balancing A German Equatorial Mount

    This post is more than five years old, and has been dormant for more than the last year.

    I'm not going to close it, for a variety of reasons, however please refer to the Forum's terms of service regarding dead-thread revival, etc:

    Astronomy Forum Rules and Terms of Service - Part One, The Legal Stuff
    CGEM 800 HD, NexGuide,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    XT8 Limited Edition, Oberwerk BT-100, Canon 20D/20Da/T3i/60D/5D Mk III, various eyepieces, adapters, geegaws, widgets, and tiddlybits

 

 
Page 3 of 3 FirstFirst 123

Similar Threads

  1. Mount balancing
    By AJin YYC in forum Astronomy Beginners Forum
    Replies: 3
    Last Post: 09-02-2010, 04:02 AM
  2. German Equatorial Mount Versus Altazimuth Mounts
    By admin in forum Telescope Mounts Forum
    Replies: 5
    Last Post: 02-05-2009, 12:36 AM
  3. Balancing a LDX-75 Mount
    By bobjdonovan in forum Telescope Mounts Forum
    Replies: 4
    Last Post: 01-25-2009, 04:54 AM
  4. Replies: 0
    Last Post: 05-10-2006, 11:04 PM
  5. German Equatorial Mount
    By Keith Woodard in forum Amateur Astronomy Forum
    Replies: 8
    Last Post: 09-09-2005, 04:26 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 07:14 AM.