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Thread: Balancing a CEM60

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    Default Balancing a CEM60



    Hi all. Just joined the forum and have my first question of many. I have a CEM60 and wondering if it requires a compensation balance to counteract gear backlash. Should I balance the RA east heavy (heavier on the telescope side) when imaging to the west and heavier on the counterweight side when imaging to the east? Does the DEC axis require any balance adjustment?
    Alex
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    Default Re: Balancing a CEM60

    Quote Originally Posted by ic_1101 View Post
    Hi all. Just joined the forum and have my first question of many. I have a CEM60 and wondering if it requires a compensation balance to counteract gear backlash. Should I balance the RA east heavy (heavier on the telescope side) when imaging to the west and heavier on the counterweight side when imaging to the east? Does the DEC axis require any balance adjustment?
    I'm not sure about the others, but I don't bother with mine. Same for RA and DEC
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    Default Re: Balancing a CEM60

    Balancing "East" heavy here in the North worked well on my Zmount when using it to image with but that's not quite the same mount as the CEM60. There are a few owners of the mount on here. I'm surprised they have not chimed in. Hopefully they have clear skies and are busy using them.
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    Default

    I balance east heavy in RA and camera end heavy in DEC. With my WO 71mm on I don't readjust counterweight after meridian flip. I am able to achieve 0.35-0.45 total RMS over hours of imaging. With a little heavier scope like my 8" RC I may readjust after flip.


    -Brad
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    Default Re: Balancing a CEM60

    I have been balancing mirror heavy in DEC which I guess is the same as camera heavy on a refractor. For RA when I imaged east I balanced scope heavy and counterweight heavy when imaging west. So the consensous is if you balance counterweight heavy (thats east heavy when imaging west) it should be ok no matter if you image East or West?
    Alex
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    Default Re: Balancing a CEM60

    Quote Originally Posted by ic_1101 View Post
    I have been balancing mirror heavy in DEC which I guess is the same as camera heavy on a refractor. For RA when I imaged east I balanced scope heavy and counterweight heavy when imaging west. So the consensous is if you balance counterweight heavy (thats east heavy when imaging west) it should be ok no matter if you image East or West?
    When balancing Dec, it doesn't matter which end is heavy, since Dec isn't supposed to be moving anyway if everything is perfect.

    You have the directions wrong. Imaging west, the scope is on the east side of the mount and the counterweights are on the west. So you would want the scope (east) side heavy. That keeps the gears lifting consistently as the mount tracks.

    If the balance is the opposite way, i.e. west-heavy, which you would get after a meridian flip, the gears are lowering the weight. You are counting on friction being low enough that the weight can descend smoothly.

    If friction is high, as it is in Synta mounts with their legendarily thick grease, and you are west-heavy, friction could hang up the mount, causing the mount not to track for a bit until the gears had taken up the backlash and started pushing. On such a mount, you would want to always balance east-heavy, and you would need to re-balance after a meridian flip. However, the CEM60 has very low friction in comparison, so this is not a problem. I just balance my CEM60 east-heavy and don't touch it after a flip.
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    Default Re: Balancing a CEM60

    Ioptron recommends balancing east heavy.
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    Default Re: Balancing a CEM60

    You are absolutely right Kathy and thats the way I do it as well. I think im just getting myself in a knot with all this eastheavy westheavy scope and counterweight heavy.
    Right now when I image West I have my scope (east) side heavy. Can I leave it like that when I image East as well?
    Brodavid1953 likes this.
    Alex
    Scope: ES 152mm f4.8 Mak-Newt Mount: iOptron CEM60, iOptron tri-pier Cameras: Nikon D5300, ZWO asi120mm Accessories: Orion 60mm Guidescope, Polemaster Software Photoshop, StarTools, BYNikon, PHD2, DSS, Astrotortilla

 

 

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