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Thread: Bungee coed counter balance system

  1. #1
    SC ed's Avatar
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    Default Bungee coed counter balance system



    I've searched the forum and cant find a thread on the use of bungee cord as a counter balance for front end heavy scopes. Believed had seen where Hubble Optics was doing this with their scopes, but now cant find a link. So, is anyone using bungee cords as a counterbalance, and if so how is it working for you, also, would you share pictures.
    Thanks

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    Default Re: Bungee coed counter balance system

    Huh never heard of such a thing, don't even know how it would work actually since it would always be changing.

    My solution for 'nose heavy' ota was a set of ankle weights.

    20170923_172132 by Tom Whit, on Flickr
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    Default Re: Bungee coed counter balance system

    I have heard of people using long springs, magnetic weights and solutions like the one UM posted above but not bungee cords.

    Hubble Optics has this statement on their site:

    Some counter (either real or spring load) counter weight is required to
    balance the scope by design. A rubber band counter weight system is
    provided as one simple solution. However, you may use your own real
    counter weight for better result.


    It appears that you may be a bit better off going a different route.

    What scope are you trying to balance? Maybe someone here has already come up with a solution.
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    Default Re: Bungee coed counter balance system

    Sorry not trying to balance a scope, it's in balance, just trying to learn. Hate weights for multiple reasons just thought the bungee cord concept was on the surface rather elegant. Know I have see a picture of such a system somewhere. More intilectual curisity than anything else
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    Default Re: Bungee coed counter balance system

    A few months ago someone posted a picture of a modification to a Hargreaves Strut for their dobsonian, that would probably work better than a bungee cord or springs if weights did not interest you.
    I looked on Hubble Optics website to see if they had an image of their setup but could not find one.

    Found the post: Alt axis strut for Z12
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    Default Re: Bungee coed counter balance system

    This is a very complete and well illustrated explanation, but you will want to be alert and at your best to cope with the English translation of the text.
    Re-dynamic balancing with rubber bands, of "light" dobsonian telescope | The Grattavetro
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    Default Re: Bungee coed counter balance system

    What I want to know is what is a "BUNGEE COED", SC?
    And how does a COED balance? :-)
    Just kidding.

    I was remembering Tom mentioning bungee cords to dampen vibration on my 127 on my slightly undersized cg4 mount.
    In my case it is not serving as a counter balance as such...just a dampening technique for vibration.
    Last edited by Eagleheaf; 10-13-2017 at 01:38 AM.
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    Default Re: Bungee coed counter balance system

    Trombatissimo,
    Thanks for supplying the link to the article. Slow but good first reading, will take several more to fully understand.
    Also glad he added the discussion of how his systems keep the scope from drifting up with changes of eyepieces. However, it only addresses the issue. If the eyepieces are within 250gr of each other, not with a change from one like 2 inch wide field to 1.5 inch. A break of some nature would seem to be needed for that level of change.
    Also, thanks to all that have responded. Not being an engineer I lack the basic knowledge but that doesn't stop the interest in learning

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    Default Re: Bungee coed counter balance system

    Quote Originally Posted by SC ed View Post
    Trombatissimo,
    Thanks for supplying the link to the article. Slow but good first reading, will take several more to fully understand.
    Also glad he added the discussion of how his systems keep the scope from drifting up with changes of eyepieces. However, it only addresses the issue. If the eyepieces are within 250gr of each other, not with a change from one like 2 inch wide field to 1.5 inch. A break of some nature would seem to be needed for that level of change.
    Also, thanks to all that have responded. Not being an engineer I lack the basic knowledge but that doesn't stop the interest in learning
    For more subtle incremental control, you can use a short bungee stretched from the center of the altitude bearing to a series of hooks running vertically up one side of the base. They simply pull down to apply more pressure on the bearing. I have also seen a bicycle disc brake used with the cable end attached to a Bob's Knobs collimation bolt replacing the bicycle brake lever. You just turn the knob until you have the desired level of damping on the altitude bearing. If you leave a section of inner cable exposed and run a guide pulley along it you can use a bicycle quick release seat post clamp to provide an instant lock that doesn't effect the knob adjuster. You can also give the knob a few turns to lock the scope, but that requires you to re-find the correct tension every time you lock and unlock.
    Last edited by Trombatissimo; 10-13-2017 at 12:34 PM.
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    Default Re: Bungee coed counter balance system

    Quote Originally Posted by Eagleheaf View Post
    What I want to know is what is a "BUNGEE COED", SC?
    And how does a COED balance? :-)
    Coeds can balance very well if they are gymnasts or ballet folks. However I've never met a bungee coed who was balanced. Not saying it's impossible, just not in my experience.

    Seriously I use the solution referred to by UM but in a more compact form.

    Like this
    https://www.amazon.com/Ankle-Wrist-W...ight+one+pound

    and I attach them where I want to the OTA with carabiner and magnet

    https://www.amazon.com/SUPER-Strong-...gnet+carabiner
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