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motor advice for rotating crt setup
Kaytrim:
--- Quote from: Ed_McCarron on October 10, 2007, 10:44:55 am ---
--- Quote from: bluevolume on October 10, 2007, 09:20:09 am ---
--- Quote from: Ed_McCarron on October 10, 2007, 08:09:06 am ---http://www.allelectronics.com/cgi-bin/item/DCM-287/400400/POWERFUL_RIGHT-ANGLE_DRIVE_DC_MOTOR_(USED)_.html
24vdc, 46RPM.
Cheap, slow-ish, and pretty strong for its size. Nice large shaft. Looks easy to mount.
--- End quote ---
My question here is still how do you plan on powering that motor? I don't see how you can get around having to buy another transformer.
--- End quote ---
It'll run at 12v, with reduced speed and torque. It'd probably still be enough to spin the monitor, considering the gear and friction-drive reductions.
--- End quote ---
According to the site it will work with a min of 14VDC so getting 12v off a PC PS won't work.
Neverending Project:
What about using a couple of pistons from a tailgate or hatchback? The have a fixed travel, move slowly, and move heaps of weight. You could put one on each side (both pointing up so they are opposing in rotational motion) and make a simple mechanical release to unlatch them. When you want to rotate CCW, you would release the right one and it would rotate the monitor and compress the left one. Vice versa for CW rotation.
The only question is will the torque of one piston be enough to compress the other? Also, since they are so strong, you would need a relatively stiff frame so you don't risk crushing it. Maybe some metal L-brackets to reinforce?
Ed_McCarron:
--- Quote from: Kaytrim on October 10, 2007, 10:55:00 am ---
--- Quote from: Ed_McCarron on October 10, 2007, 10:44:55 am ---
--- Quote from: bluevolume on October 10, 2007, 09:20:09 am ---
--- Quote from: Ed_McCarron on October 10, 2007, 08:09:06 am ---http://www.allelectronics.com/cgi-bin/item/DCM-287/400400/POWERFUL_RIGHT-ANGLE_DRIVE_DC_MOTOR_(USED)_.html
24vdc, 46RPM.
Cheap, slow-ish, and pretty strong for its size. Nice large shaft. Looks easy to mount.
--- End quote ---
My question here is still how do you plan on powering that motor? I don't see how you can get around having to buy another transformer.
--- End quote ---
It'll run at 12v, with reduced speed and torque. It'd probably still be enough to spin the monitor, considering the gear and friction-drive reductions.
--- End quote ---
According to the site it will work with a min of 14VDC so getting 12v off a PC PS won't work.
--- End quote ---
Whoops... Thats what happens when you assume.
OK, use the +12 and the -5 for 17v... Kidding... The -5 is only good for a few ma...
So use a 24v ps. Its not like they are all over ebay for $10...
DaOld Man:
--- Quote from: Neverending Project on October 10, 2007, 11:08:50 am ---What about using a couple of pistons from a tailgate or hatchback? The have a fixed travel, move slowly, and move heaps of weight. You could put one on each side (both pointing up so they are opposing in rotational motion) and make a simple mechanical release to unlatch them. When you want to rotate CCW, you would release the right one and it would rotate the monitor and compress the left one. Vice versa for CW rotation.
The only question is will the torque of one piston be enough to compress the other? Also, since they are so strong, you would need a relatively stiff frame so you don't risk crushing it. Maybe some metal L-brackets to reinforce?
--- End quote ---
I think what you are describing is a perpetual motion machine. (Which is impossible due to physics.)
You will need a force applied to overcome the opposing cylinder.
Two cylinders acting against each other with no applied force in either direction will not work. :)
DaOld Man:
--- Quote from: DaOld Man on October 10, 2007, 11:21:11 am ---
--- Quote from: Neverending Project on October 10, 2007, 11:08:50 am ---What about using a couple of pistons from a tailgate or hatchback? The have a fixed travel, move slowly, and move heaps of weight. You could put one on each side (both pointing up so they are opposing in rotational motion) and make a simple mechanical release to unlatch them. When you want to rotate CCW, you would release the right one and it would rotate the monitor and compress the left one. Vice versa for CW rotation.
The only question is will the torque of one piston be enough to compress the other? Also, since they are so strong, you would need a relatively stiff frame so you don't risk crushing it. Maybe some metal L-brackets to reinforce?
--- End quote ---
I think what you are describing is a perpetual motion machine. (Which is impossible due to physics.)
You will need a force applied to overcome the opposing cylinder.
Two cylinders acting against each other with no applied force in either direction will not work. :)
--- End quote ---
But... you raise an interesting idea...
What about an air cylinder?
Pneumatics are used in several different applications. An air cylinder can move a lot of weight, it is quite, speed can be adjusted, and no magnetism.
Of course one would need an air compressor.
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