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motor advice for rotating crt setup
DaOld Man:
--- Quote from: Anubis_au on October 09, 2007, 04:08:37 am ---3. use a bike gear connected to a bike chain which is nailed to the outside of the circular plate.
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I like your idea of using a bike chain as the driven gear and a bike sprocket as the pinion.
Just remember guys, the monitor only turns 90 degrees, so the chain or big gear does not have to go all the way around.
I have thought about using a rotating monitor on my cab.
I have drawn up an electrical diagram that uses relays to switch a DC motor.
Turn switch on, motor rotates to a certain point set by a limit switch and stops.
Turn switch off motor rotates backwards to another limit switch and stops.
This switch could be an output from the computer's printer port.
I was thinking of letting the computer automatically turn the monitor based on the game you have chosen.
I sorta put this on the back burner, but this thread has got me started again.
Oh, and by the way, Anubis, we call the mechanical types at my job "Flange Heads".
And they call us electricians "Watt Heads".
ahofle:
--- Quote from: danny_galaga on October 09, 2007, 06:04:52 am ---
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That is so awesome -- nice job.
:applaud:
How did you get it to stop perfectly at 90 degrees?
Cornchip:
I'd seriously think about going with something that didn't use a 'friction drive'. Your monitor is at 45 degrees and might bind with all the mass hanging off the back. Consider a rear bearing if at all possible. The use of a 12V gear motor is the simplest due to it's high torque and simple polarity reversing (switch or relay). Also power window motors are worm gear driven...they will hold a load while stopped. Plan or rotating at something like 3 RPM. Sounds slow....but consider the weight involved (accelerate and decelerate count here). It's a whole other ball game with an upright cab vs. a cocktail. Do you have room behind the monitor for a chain drive as mentioned earlier? If that's a little complex for machining reasons I have another thought on something simpler not mentioned.
Cornchip.
sac01:
I was just looking at that drawing and I was thinking you could center the motor down under the monitor wheel, and do the same thing with the rope/cord, except not use the counter weight, and just have the cord wrap around a dowel connected to the motor wound in one direction, then it goes over the top of the monitor wheel (afixed at the top with a clamp or screw thru the cord) then it goes down the other side where you had the counter weight, but in place of the weight it wraps around the same dowel (dowel long enough to allow two windings of rope with something to seperate them like a large washer) in the opposite direction (counter clockwise if the other is wrapped clockwise) Then when you run the motor to rotate to horizontal, one side releases the cord and the other pulls the cord, when you reverse the motor to go to vertical, it pulls on the other side of the cord and releases the the opposite side) Seems pretty fool proof, simple, and alot easier than a chain drive (probably quieter to)
Cornchip:
You could put the motor any where you like with this setup. Just use idler pulleys to redirect the pull. As for the main drum...just wrap either ropes in a 'right hand' and 'left hand' fashion. No need then of a second pulley. And your right about this being quiet. My chain was quiet by the way. It goes so slow that noise is not a problem. You do hear the motor. It's kinda the point.
Cornchip.