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Thread: Installing a motor drive on my mount

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    Default Installing a motor drive on my mount



    Hey guys. A newbie with a stupid question probably...

    I bought cheap this old Saxon telescope and it came with a mount that looks much better than the one I have with my Celestron Astro master 130. I have no idea what the model is and not sure if it is the original one that shipped with the telescope. Somewhere online I read that it should be EQ2 or EQ3 and the motor is optional. Can you help with finding the right RA motor for the mount? I guess I could easily retrofit the motor from my Celestron mount (pictured below), but then I will lose the slow motion control.

    The mount:











    There is a threaded hole in the circle. Something should go there. Mounting point for a motor probably?



    The motor drive I could retrofit:



    Any ideas guys?

  2. #2
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    Default Re: Installing a motor drive on my mount

    The Skywatcher/ Celestron EQ-2 or 3 motor should work fine for the mount as it has adjustable speed.
    You may have to build a bracket for it though.
    Your mount looks like a older EQ-3, it looks to be in nice shape.
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    Default Re: Installing a motor drive on my mount

    Hey Gabby76
    Yes, it IS in nice shape. It's been sitting in storage for years judging by the smell , but mount and especially the optical system are spotless.
    DIY-ing a bracket is what I'm going to do to mount the Celestron drive. That looks easy enough. The only thing that bugs me is that this way I can't use the slow motion, but I guess I'll have to swallow this...

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    Default Re: Installing a motor drive on my mount

    Quote Originally Posted by nikolav View Post
    DIY-ing a bracket is what I'm going to do to mount the Celestron drive. That looks easy enough. The only thing that bugs me is that this way I can't use the slow motion, but I guess I'll have to swallow this...
    Some options ...

    1. You could use these set screws for the motor coupler to make it easy to loosen the coupler in the dark and thus move the RA slow motion knob.
    ScopeStuff

    2. If you are into DIY electronics you could use a Stepper motor and arduino instead of the celestron motor. Some hybrid steppers allow the shaft to move when the power to the stepper is turned off. So by flipping a switch you get the RA slow motion to work. A DIY stepper also solves the problem of fiddling with the tiny potentiometer on the Celestron drive to get the correct rate, but is not as compact as the celestron drive (needs 12V too).

    3. You could go more DIY and install an ONSTEP setup which would have all the goodies of a dual axis drive.
    https://groups.io/g/onstep You could post your question there too, in case someone has seen your mount before and already knows how to mount motors with clutches on it.
    AR
    TScopes: Zhumell Z8, Bushnell 1300x100 Mak, Meade Adventure 80mm
    Mount: ES EQ Nano Mount, Arduino,Stepper RA drive, 50mm guidescope, AR0130 based guidecam
    Eyepieces: ES82 18,11,6.7mm, Zhumell 30,9mm FJ Ortho 9mm, assorted plossls, Meade 2x S-FBarlow, DGM NPB filter
    Binos: Celestron Skymaster 15x70 (Albott tripod/monopod), Nikon Naturalist 7x35

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    Default Re: Installing a motor drive on my mount

    Hey AsteroidsRock
    Unfortunately, I have absolutely no experience in DIY electronics or programming. But I have a friend working with Aurdino and willing to help. And I'm willing to learn...
    Thank you for the links! I'll have a look at it. Definitely worth trying. I will ask more questions when I know what I want to do

    Cheers!
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    Default Re: Installing a motor drive on my mount

    I was looking at your mount pictures and realized that unlike the recent mounts your RA worm shaft does not extend on both sides. Which means you have to detach the slow motion cable unless you can come up with some belt drive. So the above option 1 is not going to work. Option 2 can still work, but you have rotate the coupler by hand when the motor is turned off for slow motion.

    Also note that all Stepper motors do not have this property of the shaft turning when switched off. I found it by chance because the stepper I bought had this feature. Here is a link to it.
    https://www.banggood.com/JKM-Nema-17...r_warehouse=CN

    Some links of interest are
    https://www.cloudynights.com/topic/6...her-eq5-mount/
    https://forum.arduino.cc/index.php?topic=245679.0 ( this has guiding too, but you can use the same arduino code)
    You will have to input the gear ratios for your mount in the code which you can find out by trial and error.
    AR
    TScopes: Zhumell Z8, Bushnell 1300x100 Mak, Meade Adventure 80mm
    Mount: ES EQ Nano Mount, Arduino,Stepper RA drive, 50mm guidescope, AR0130 based guidecam
    Eyepieces: ES82 18,11,6.7mm, Zhumell 30,9mm FJ Ortho 9mm, assorted plossls, Meade 2x S-FBarlow, DGM NPB filter
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    Default Re: Installing a motor drive on my mount

    Hey, AsteroidsRock!
    Thank you for your links, mate. Very helpful to me.
    After some reading, I think I'm going after the OnStep option. If I understood the concept right, I need to choose one of the supported chipsets (sorry if I sound lame here, but I have zero understanding of electronics) and by trial and error to tune the stepper motor speeds for my mount? And probably the most challenging part will be attaching the motors to the mount.
    I reckon the mount I have is not good enough for AP, but anyway I'm keen to try and if I upgrade it one day. I guess I can keep the controller and use it with a better mount.
    Re. rotating the mount by hand I'm thinking of making/using the optional hand controller for that purpose.
    Regarding selecting the right motors. Can I use the same motors for tracking and GOTO operation? I mean is there a motor which is good enough for both options or do I need to make some compromise choosing my priorities here?

    Cheers!

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    Default Re: Installing a motor drive on my mount

    Quote Originally Posted by nikolav View Post
    Hey, AsteroidsRock!
    Thank you for your links, mate. Very helpful to me.
    After some reading, I think I'm going after the OnStep option. If I understood the concept right, I need to choose one of the supported chipsets (sorry if I sound lame here, but I have zero understanding of electronics) and by trial and error to tune the stepper motor speeds for my mount? And probably the most challenging part will be attaching the motors to the mount.
    I reckon the mount I have is not good enough for AP, but anyway I'm keen to try and if I upgrade it one day. I guess I can keep the controller and use it with a better mount.
    Re. rotating the mount by hand I'm thinking of making/using the optional hand controller for that purpose.
    Regarding selecting the right motors. Can I use the same motors for tracking and GOTO operation? I mean is there a motor which is good enough for both options or do I need to make some compromise choosing my priorities here?

    Cheers!
    Yes you have to pick a chipset. The gear ratios of EQ mounts are usually known and if someone on the onstep forums can figure out your mount origin, you can get the gear ratios. Otherwise you have to resort to trial and error to figure out the gear ratios and thus the speed of your stepper rotation.

    The motors are the same for tracking and slewing/goto, you will have to pick motors powerful enough for your mount. The conceptual problem of tracking and slewing, is that tracking is a very slow movement, and slewing and goto need to be fast to be useful. It is difficult to do both of these well using the limited pins on a chipset. Usually it means that slewing/goto are slower than they can be. Look for a list of successful examples on the onstep site, and that will give you examples of chipsets/motors people use for mounts like yours. There also exist 3D printable designs for brackets for some mounts. Mounting is difficult indeed, but amazing things can be done with L brackets and a hand drill

    Another solution like ONSTEP is AstroEQ, I think they don't sell chipsets anymore, but the website/forums are quite good to learn. If I remember right they had a table of gear ratios for common mounts.
    AR
    TScopes: Zhumell Z8, Bushnell 1300x100 Mak, Meade Adventure 80mm
    Mount: ES EQ Nano Mount, Arduino,Stepper RA drive, 50mm guidescope, AR0130 based guidecam
    Eyepieces: ES82 18,11,6.7mm, Zhumell 30,9mm FJ Ortho 9mm, assorted plossls, Meade 2x S-FBarlow, DGM NPB filter
    Binos: Celestron Skymaster 15x70 (Albott tripod/monopod), Nikon Naturalist 7x35

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    Default Re: Installing a motor drive on my mount

    Hm... My replay was lost. Sorry if that doubles up.

    I ordered the parts for Onstep. The good about is one doesn't need to know Aurdino and how to program it. It is all done for us. The bad part is the last time I soldered something was probably 15 years ago.

    The mount is probably better than I thought. The gear ratio is 144:1 on both axis which suggests it is an EQ5 type mount. Probably a Bresser EXOS1 (or 2) clone.
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    Default Re: Installing a motor drive on my mount

    Yeah, I had to solder for my Arduino based mount, hadn't done that since I was a teenager

    I did it before I discovered ONSTEP, and it is only a RA drive, and so I rolled up my own hardware/software, had to learn to program the Arduino. With all the web tutorials available, and with similar projects done before by others, it is not that difficult these days.

    You could start a thread in the DIY forum with the details and experiences of your ONSTEP build. It would help others to see a concrete example.
    AR
    TScopes: Zhumell Z8, Bushnell 1300x100 Mak, Meade Adventure 80mm
    Mount: ES EQ Nano Mount, Arduino,Stepper RA drive, 50mm guidescope, AR0130 based guidecam
    Eyepieces: ES82 18,11,6.7mm, Zhumell 30,9mm FJ Ortho 9mm, assorted plossls, Meade 2x S-FBarlow, DGM NPB filter
    Binos: Celestron Skymaster 15x70 (Albott tripod/monopod), Nikon Naturalist 7x35

 

 
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