3 ms·

Tried to find some mechanical data on this and couldn't :( . What's the size of it, what's the working speed of motors?..

by avmich 5y ago

deleted 5y ago
[deleted]
dekhn 5y ago
literally everything is on the website.
- avmich 5y ago
  If that information is there, it's definitely not easy to find. Can you share a link?
  - dekhn 5y ago
    Your questions are: how big is it and what are the working speeds of the motors. It is this big: https://wiki.openastrotech.com/alu-oat.jpg https://wiki.openastrotech.com/alu-oat.jpg but if you need more accurate dimensions: https://wiki.openastrotech.com/en/OpenAstroTracker/Printing https://wiki.openastrotech.com/en/OpenAstroTracker/Printing (select the appropriate parts aand look at their dimensions in a 3D STL viewer. Those are in millimeters) and then look at the youtube video where you can see it in context. The motors: the working speed of the motor is identical to the speeds required to keep the scope aligned. For one of the axes, that means it causes the system to do a full 360 rotatation every 24h. Steppers (both the small kind and the big kind) can work at 1500RPM but this is irrelevant- we care much more about precise small movements.
    - avmich 5y ago
      Thank you very much; I was hoping for some more direct answers, e.g. diameter of the ring is 400 mm and speed of rotation is up to 15 RPM. I'd like to do something significantly different with this design (outside of astro-photography, so different properties and ranges are relevant) and was interested in existing capabilities. I saw the video and knew approximate values, I just wanted to see explicit specs - like blueprints for parts with sizes, or capabilities of motor-belt-ring coupling.
      - dekhn 5y ago
        you don't want this design for non-astrophotography. Much of the design is centered around rotating the imaging device in sync with the rotation of the earth so you can take exdtremely long exposures. Instead, you probably want something like this: https://www.bhphotovideo.com/c/product/689699-REG/Giga_Pan_EPIC_PRO_EPIC_Pro_Robotic_Camera.html https://www.bhphotovideo.com/c/product/689699-REG/Giga_Pan_E... There aren't "blueprints" but the STL files for the printed parts and the assembly provide the same information. Motor belt couplings like this are pretty well understood, mainly within the context of moving XY stages for 3D printers, but also in the larger context of industrial movement. Unfortunately, I don't think all of that is really documented in a way that is useful for people who aren't willing to invest significant effort into learning how to work with 3D printers, etc (or get a degree in mechanical engineering).

Tried to find some mechanical data on this and couldn't :( . What's the size of it, what's the working speed of motors?..

by avmich 5y ago

Tried to find some mechanical data on this and couldn't :( . What's the size of it, what's the working speed of motors?..

deleted 5y ago

[deleted]

dekhn 5y ago

literally everything is on the website.

avmich 5y ago
If that information is there, it's definitely not easy to find. Can you share a link?
- dekhn 5y ago
  Your questions are: how big is it and what are the working speeds of the motors. It is this big: https://wiki.openastrotech.com/alu-oat.jpg https://wiki.openastrotech.com/alu-oat.jpg but if you need more accurate dimensions: https://wiki.openastrotech.com/en/OpenAstroTracker/Printing https://wiki.openastrotech.com/en/OpenAstroTracker/Printing (select the appropriate parts aand look at their dimensions in a 3D STL viewer. Those are in millimeters) and then look at the youtube video where you can see it in context. The motors: the working speed of the motor is identical to the speeds required to keep the scope aligned. For one of the axes, that means it causes the system to do a full 360 rotatation every 24h. Steppers (both the small kind and the big kind) can work at 1500RPM but this is irrelevant- we care much more about precise small movements.
  - avmich 5y ago
    Thank you very much; I was hoping for some more direct answers, e.g. diameter of the ring is 400 mm and speed of rotation is up to 15 RPM. I'd like to do something significantly different with this design (outside of astro-photography, so different properties and ranges are relevant) and was interested in existing capabilities. I saw the video and knew approximate values, I just wanted to see explicit specs - like blueprints for parts with sizes, or capabilities of motor-belt-ring coupling.
    - dekhn 5y ago
      you don't want this design for non-astrophotography. Much of the design is centered around rotating the imaging device in sync with the rotation of the earth so you can take exdtremely long exposures. Instead, you probably want something like this: https://www.bhphotovideo.com/c/product/689699-REG/Giga_Pan_EPIC_PRO_EPIC_Pro_Robotic_Camera.html https://www.bhphotovideo.com/c/product/689699-REG/Giga_Pan_E... There aren't "blueprints" but the STL files for the printed parts and the assembly provide the same information. Motor belt couplings like this are pretty well understood, mainly within the context of moving XY stages for 3D printers, but also in the larger context of industrial movement. Unfortunately, I don't think all of that is really documented in a way that is useful for people who aren't willing to invest significant effort into learning how to work with 3D printers, etc (or get a degree in mechanical engineering).