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Thread: Mount balancing

  1. #1
    AJin YYC's Avatar
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    Default Mount balancing



    Can someone please explain to me balancing the scope to the east? Probably alot easier than I am thinking but hey im new at this!! haha

    To paraphrase a book im reading...

    "using an equatorial mount, adjust the counterweights on the dec shaft so that the scope is slightly heavy on the eastern side. This will ensure the right ascension worm and gear are always engaged by making the scope lift just a little weight and removes any slop the gears.

    If you have a mount with a worm and gear on the declination axis , Once the scope is completely set up, pa'd and the object acquired, you can add a tiny amount of weight to the declination balance so that the gears are always engaged.


    eastern side?

    cheers,
    AJ
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  2. #2
    WWPierre's Avatar
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    Default

    Your polar axis points north. When I set up, and put the tube horizontal to balance it, the objective lens points west, so I favor the eyepiece end slightly.
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  3. #3
    alsetalokin's Avatar
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    Default

    If you are facing North, East is on your Right side.

    The RA axis of the mount should be facing North. So, depending on the targets you are looking at, the telescope on its saddle will be either on the East side of the RA axis, or on the West side of the RA axis. Since the mount is driving the OTA in RA motion from East to West, if you want the gear backlash to be always minimum, your scope should bear down a bit on the gear train...thus, it should be slightly heavy to the East side. If it was the other way, the weight would make the scope "fall" ahead of where the gears are trying to drive it, resulting in a jerky motion in the RA direction.
    So, when the target (and telescope) is on the East side of the mount, you want the balance to favor the telescope...the scope should be very slightly heavy. On the other hand, when the target and scope are on the West side of the mount, you still want the East side to be heavy for the same backlash reason...so the balance should favor the counterweight, which is on the East side.
    Just remember that the balance should always be slightly heavy to the East, no matter which side the scope is on, for the RA backlash to be on the correct side of the drive gear train. This might mean readjusting your balance when your target crosses the meridian.

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  4. The Following 2 Users Say Thank You to alsetalokin For This Useful Post:

    Joe Lalumia (09-02-2010),orion58 (01-30-2012)

  5. #4
    AJin YYC's Avatar
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    Default

    that explains it perfectly ..thanks fellas
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