Hi, very original idea! May I ask you how do you align the rotational motion with the polar? Is there a correct inclination of the shaft? What is the fixed point where the rod must be anchored? Should it be set to 180 ° azimuth? Thanks.
This is an old technic, not my idea. The altitude pivot point of the Dob, and the pivot point of the additional mechanism point to the Polaris. The disadvantage is, that this mechanism can be used only at the Southern sky. I mean from E to W.
Like many, I am extremely fascinated by what you have constructed here! This is such a simple and elegant approach to basic tracking for a Dob. I understand that an EQ platform is better, but I still want to learn more about this method and replicate it for my telescope. I would just be using it for Southern sky observation from 40 degrees lat. I have researched old methods and can't seem to find anything on this. So, Horvath, is there a name for this method? Who invented it? Your lower pivot point is raised from the base. Is there a calculation for that? Any math or specs you can share with us will be greatly appreciated! Thanks so much for revealing this technique! Well done!
IIRC this is a Quasi-Equatorial mounted Crawford-Dobsonian telescope. It mimics an equatorial mount, but lacks the rotation aspect that a true equatorial mount demonstrates.
Hi! This is a very old method for tracking with telescopes. I used this construction just for few weeks. It works nice, but it is usable only for the southern side of sky, so for the planets, moon, etc.. The setup is very difficult. I have made an eq-platform, so this solution is unnecessary for me. ua-cam.com/video/e0_8ljLSzao/v-deo.html
Dear Todd. It is a very old design, and I used it only for few weeks because of it's limitation. For tracking an eq-platform would be a much better choice. tms-astro.webnode.hu/
That's very clever. I guess the Alt control varies with the declination? Now, if you want to take long exposure shots, you will need to motorize it and compensate the angle variation at the eye piece. Loved the idea.
Do you have the blueprints as to how you made the part for the azimuth control? I love the idea of being to just turn the handle instead of having to push the whole tube.
I have no blueprints. This is a very old method to tracking the objects. The main thing is, that the center of the lower bearing (azimuth bearing) and the center of the upper pivot (the pivot point at the front of the tube) is on the polar axis.
Is would be so much better if you narrated this video. I am so very interested to know what you have, but you say nothing. Please consider redoing it with narration and more information on the base, the finder etc. Very very nice set up!
That looks so cool
I wish i could buy this
Is that a piston that stays in whatever position you put it in?
Hi, very original idea! May I ask you how do you align the rotational motion with the polar? Is there a correct inclination of the shaft? What is the fixed point where the rod must be anchored? Should it be set to 180 ° azimuth? Thanks.
This is an old technic, not my idea.
The altitude pivot point of the Dob, and the pivot point of the additional mechanism point to the Polaris.
The disadvantage is, that this mechanism can be used only at the Southern sky. I mean from E to W.
Like many, I am extremely fascinated by what you have constructed here! This is such a simple and elegant approach to basic tracking for a Dob. I understand that an EQ platform is better, but I still want to learn more about this method and replicate it for my telescope. I would just be using it for Southern sky observation from 40 degrees lat. I have researched old methods and can't seem to find anything on this. So, Horvath, is there a name for this method? Who invented it? Your lower pivot point is raised from the base. Is there a calculation for that? Any math or specs you can share with us will be greatly appreciated! Thanks so much for revealing this technique! Well done!
IIRC this is a Quasi-Equatorial mounted Crawford-Dobsonian telescope. It mimics an equatorial mount, but lacks the rotation aspect that a true equatorial mount demonstrates.
Hi Horvath, wonderful!
Does it work?? Is the tracking accurate? Please give us some info about your tracking system.
Hi! This is a very old method for tracking with telescopes. I used this construction just for few weeks. It works nice, but it is usable only for the southern side of sky, so for the planets, moon, etc.. The setup is very difficult. I have made an eq-platform, so this solution is unnecessary for me.
ua-cam.com/video/e0_8ljLSzao/v-deo.html
Gr8 success!!
If you have any reference/sources of this method please post 🙂
Very interesting
web.archive.org/web/20180307025224/home.freeuk.com/m.gavin/crawford.htm
Greetings Horvath, can you give me the information to this mount as I live in Australia and would love to make this for my 8" Dob.
Kindest regards.
Dear Todd. It is a very old design, and I used it only for few weeks because of it's limitation. For tracking an eq-platform would be a much better choice.
tms-astro.webnode.hu/
Very clever design!
That's very clever. I guess the Alt control varies with the declination?
Now, if you want to take long exposure shots, you will need to motorize it and compensate the angle variation at the eye piece.
Loved the idea.
It’s a very very old design. For tracking with dobs is a much better option an eq-platform.
ua-cam.com/video/RtwYDuN-j54/v-deo.html
Do you have the blueprints as to how you made the part for the azimuth control? I love the idea of being to just turn the handle instead of having to push the whole tube.
I have no blueprints. This is a very old method to tracking the objects. The main thing is, that the center of the lower bearing (azimuth bearing) and the center of the upper pivot (the pivot point at the front of the tube) is on the polar axis.
the world needs more information on this design. how do you make it, where do you get the parts? do you sell these?
That was just an experiment, i don’t use this mount. A perfect mount with smootly turning is much better solution.
Nice work
What is the name of this antique way?
I don’t know, sorry. But it can be used very limited. An eq-platform is much better for tracking.
Is would be so much better if you narrated this video. I am so very interested to know
what you have, but you say nothing. Please consider redoing it with narration and more
information on the base, the finder etc.
Very very nice set up!
Hi! You have right. Sorry, but my english is not perfect, so i can't made narration.