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#1 Farfle

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Posted 23 May 2020 - 02:35 PM

Heya all!  Long time lurker and new astrophotographer. 

 

I have decided to build my own tracking EQ mount to swing around my 10" reflector, but also to have a nice stable mount for future larger setups as well. Because at the end if the day, a telescope mount is not much different than a CNC machine, just with aimable axis in weird spots!

 

The mount design is fairly simple, big bearing tubes, large spring tensioner worm/wheel drive and some modest Nema23 stepper motors. Will be driving it with an EQdrive controller.

 

128t worm wheels gives 128:1 reduction to the stepper. At about 60% transfer efficiency would yeilds about 35 ft/lbs of movement power. Accuracy will be about 2 arc seconds with a reasonable 16x microstep.

 

Still a bunch of work to do, but well on the way!

 

 

CAD design: 

 

49927161621_93ba66f831_b.jpgdownload_20200523_113609 by Jackson Edwards, on Flickr

 

49927161181_78bd4ee601_h.jpgdownload_20200523_113535 by Jackson Edwards, on Flickr

 

onwards to fab! 

 

49926622728_e7d1f6992c_h.jpg2020-05-23_11-30-34 by Jackson Edwards, on Flickr

 

 

49927141486_ce884ee8c1_h.jpg2020-05-23_11-30-12 by Jackson Edwards, on Flickr

 

 

49927137676_7bbc409eab_h.jpg2020-05-23_11-28-59 by Jackson Edwards, on Flickr


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#2 Farfle

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Posted 28 May 2020 - 03:22 PM

More progress being made!

 

49943625108_2e6470f6cd_h.jpg20200527_224702 by Jackson Edwards, on Flickr



#3 sparksinspace

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Posted 28 May 2020 - 09:58 PM

 

 

49927137676_7bbc409eab_h.jpg2020-05-23_11-28-59 by Jackson Edwards, on Flickr

Have i got my safety squints on or have i seen that hand before.

 

Cockford Olly 

 

**** and pickles for sure lol.gif lol.gif lol.gif  


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#4 Farfle

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Posted 28 May 2020 - 11:49 PM



Have i got my safety squints on or have i seen that hand before.

 

Cockford Olly 

 

**** and pickles for sure lol.gif lol.gif lol.gif  

 

Hah. Gotta make sure your lava soap and hand lotion are in the right order. 

 

Made some more progress tonight! The Declination stepper is mounted. Kinda. It works, but I'm not super happy with it. At 20ft/lbs applied there is only a few thou of slop at the 2" radius where I measured it. Not terrible, but you can see it move. That and the current method of adjusting the worm/wheel lash is by shimming the bolts on the stepper mount to tilt it towards or away from the wheel, also not real happy with that, but I'll try it and see where it goes (or doesnt) 

 

49947738702_dff8ce9901_h.jpg20200528_214402 by Jackson Edwards, on Flickr


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#5 dmcnally

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Posted 29 May 2020 - 05:30 PM

Cool project. laugh.gif   You've got some nice machines and tools to work with.

 

Good luck and have fun.

 

Clear skies,

Dave



#6 Farfle

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Posted Today, 02:22 AM

Doh!! Going to need some more burlyness. I finally got the rings and the scope mounted on it, and this thing bounces all over the place!
 
I think a majority of the flexure is coming from spring in the stepper mounts, but I'm not sure how much I want to throw at this versus a redesign and rebuild with bigger parts.
 
Either way, I am going to fix the stepper mounts and see if it is serviceable at least as a mount for a smaller scope, or worst case a nice visual observing goto mount.
 
49961864938_7eff247f62_h.jpg20200601_224407 by Jackson Edwards, on Flickr
 
49961864933_662b4d2534_h.jpg20200601_213112 by Jackson Edwards, on Flickr

 

https://youtu.be/IAiN5V_G6Yk




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