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Thread: Astro Pr0n shots of my new CGEM

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    cbrucker's Avatar
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    Default Astro Pr0n shots of my new CGEM



    can be found at my (sigh)(mumble) blog...

    Astronomy Forums | Telescope Forums & Reviews | Astronomy Community - Notes from the field. My rants raves and frothing at the mouth about this maddening and frustrating buy lovely hobby - Blogs

    This thing is INSANE in terms of size and weight compared to the CG-5ASGT! As in (Russian accent) Soviet Tractor Factory Build Insane!

    I hope that I am able to actually use it more than occasionally because it was not a lot of fun getting it up on the mount and I am already tired enough from work... I think I need to sit down and design a motorized self leveling portable pier... Humm... Something to do on my lunch breaks at work... I wonder if there is a market for it...
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    Ya know, if it's really gonna be that much of a struggle for you I'll take it off your hands for $20, and I'll even drive out there to pick it up

    Looks good and should perform admirably. Someday maybe I'll be able to get a better mount but I'll hold onto the CG5 just for portability.
    Kevin AD5VG
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    Quote Originally Posted by cbrucker View Post
    I think I need to sit down and design a motorized self leveling portable pier... Humm... Something to do on my lunch breaks at work... I wonder if there is a market for it...
    I will be your first customer!
    -John
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    Ken-

    I will trade you your setup for mine and I will drive to you!

    Cheers John. I actually started the research last night. The two big hitches will be cost and weight. I think it is doable but I need to track down spec's on a DC motor that can handle 60 lbs of weight without being too heavy in and of itself to be useful. Ideally I would like this to be able to be broken down and transported. The leveling is pretty straight forward as is the stability and control.
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    posted comments to the blog.. but as I say.. no matter how many pictures you see or how many people tell you its an anvil.. no one gets it's size until it arrives and takes over a room.
    Ken H. sharing the sky with my 9yr old daughter
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    Quote Originally Posted by fogfire View Post
    posted comments to the blog.. but as I say.. no matter how many pictures you see or how many people tell you its an anvil.. no one gets it's size until it arrives and takes over a room.
    Uhuh, that's why you need to attend NEAF or similar conventions to see for yourself how big they really are. When it comes to astronomy mounts, the camera deletes 30 pounds.

    You need to see how really big that 6" refractor you wanted really is! Mwahahaha.

    Cheers

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    Sorry that should have been Kevin not Ken in that last post.

    Ken (right person this time)-
    Boy you are right! I am now really second guessing myself on it's choice. If I can't figure out a wheeled (and maybe motorized) method of transporting it out to the yard this could end up as a very expensive boondoggle.

    Anyone have any good information on pier construction for a mobile pier? I am thinking a 2' x 2' baseplate with 5" pneumatic tires, with a locking collar at the base so I can remove a 40" aluminum tube, lock bolts on a 1/2" bolt with feet at the bottom for leveling, then the a collar for the mount. That way I could transport the mount and pier as needed as well as break it down so it could fit in the car trunk.

    I need to look into DC motors that can move 50ish lbs of weight at low speed with high torque... I am thinking 1 foot per second of motion with acceleration of 0.3' per second so it's going to have to be a DC motor with gear box but I need to take the time to track data down for larger dc motors. The self leveling option is pretty straight forward. A DC stepper motor attached to a worm drive to raise and lower the feet controlled by a micro controller with PWM capability (also will control the larger DC motor for power) wired to a set of accelerometers...
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    I have a CGEM and move it from my garage to the back yard whenever we have a clear night. I do this with the mount on the tripod. Just shorten up the legs a bit and grasp it under the spreader and lift it up, it's only about 55#'s like that. I move mine with a 17# & 11# counter weight attached, total weight is almost 80#'s. Then put the scope on it to cool down. I transport it to the desert and set it up there as well without much hassle. You will get used to it and you wont be sorry that you got it. I would suggest that you run the PEC tool from Celestron's web site as this will greatly improve the PEC in the mount. I can have mine up and running in about 15 minutes, calibrated and ready to go. It's a much better set up routine than what Meade has on their fork mounts. Prior to getting my autoguider I was able to get 2-1/2 to 3 minute shots with my C-800, now with the SSAG and a 72mm guide scope I can easily get 4-1/2 minute shots (thats all I have tried so far) without any star trails and I'm still learning and dialing in the SSAG set up. I regulary run my E/S 127 APO, guide scope, DSLR with 11# & 17# counter weights without issue. I guess that all the A/P gear weighs in at about 25#'s and the mount doesn't fuss at all.

    Clear Skies,
    Bob
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    You could always go with the custom JMI wheelie bars. They have choice of off road size wheels which I would definetly go with. You can also add a motorized unit option. This may spark some ideas also. A quality mount will definetly have some weight to it. Compared to my 12 inch LX the cgem is a dream. See this Page
    Last edited by DaltonSkyGazer; 06-04-2012 at 09:55 PM.

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    Quote Originally Posted by cbrucker View Post
    Sorry that should have been Kevin not Ken in that last post.

    Ken (right person this time)-
    Boy you are right! I am now really second guessing myself on it's choice. If I can't figure out a wheeled (and maybe motorized) method of transporting it out to the yard this could end up as a very expensive boondoggle.

    .
    Just to let you know... I had the same reaction... I can't judge your physical capabilities I am a 49 yr old fat man with back issue history and funky knees... So I also worried the "Anvil" would be a problem.. honestly for the first week .. was worried I had bitten off too much and sheepishly would end up reselling .. but after a couple of sessions with it and the 9.25" Its not even a chore.. I have rushed it out for short clear holes even. The 11" OTA will 3/4 the weight so.... this is where you figure out if that will happen....

    But the the shear shock of its weight.. and size did surprise me..

    If you are going to build a "tank" for it.. why not just do what Lonnie did... a roll away shed/observatory.. its Genius.!!!
    Ken H. sharing the sky with my 9yr old daughter
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