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Rotating Monior motor question?
JoyMonkey:
--- Quote from: patrickl on May 14, 2004, 10:33:40 am ---Would a stepper motor from an old inkjet printer be powerful enough?
--- End quote ---
I seriously doubt it. I work in a sign fabrication shop, I know we've used stepper motors for a few big mechanized signs in the past that were small, cheap and high torque. If I get the chance to talk to one of the engineers today and I'll try and get more details.
patrickl:
It might be just a matter of gearing though.
It's just that the way I see that print head flip back and forth I assume there must be some power in there. My old HP 1200 would make the whole table, it was standing on, shake.
One problem I can't see how it will get fixed is how the monitor will stay locked in place. I understand a motor will be able to turn the monitor into the desired direction. But when you switch the motor of won't it wobble away from vertical. Might be less of an issue for a CRT monitor though and I'm thinking about a rotating LCD monitor (which spins quite easily)
Hammerbot:
The way I did it was to use a DC gearmotor from Grainger. ($50) I used a STDP relay and 2 limit switches to run the mechanism back and fourth.
I useda a sprocket and a chain drive to pull it in either direction.
It works pretty well but I wish the motor was a bit bigger than the 1/25 hp that it is. It seems to almost stall out some times. I might boost the votlage to see what happens...
danny_galaga:
see my site for what i did:
http://dannygalaga.com/mame.htm
i used a tamiya planetary gear-box kit ($27 Australian, should be less than $20 USD). I used a 1/12 scale r/c wheel to drive the monitor base plate. this is on a 15" in a cocktail though. The total ratio is somewhere in the region of 2000/1 which rotates through 90 degrees in less than three secs. Good thing about this method is that if something goes wrong, the drive wheel will just slip instead of the motor stalling and burning out. I use an on/on toggle to activate. powered by the speaker transformer. No need for relays or anything.I d love to hear from anyone who has theirs switched by software!
larger monitors in an upright i would suggest hacking an electric screwdriver. theyve plenty enough torque.
Also, where I have stop switches for the motor, i also have switches to turn the monitor on and off. being a 15" pc monitor it normally degausses in the three seconds or less time it is off. But i will add a relay with a capacitor to delay it switching on for another second after it stops moving. Commando in particular seems susceptable to problems- the corners go purple.
here is a GIF of the beast. for a short movie of it in action go to the bottom of the 'craftwork' section on my site.
danny_galaga:
forgot to mention my thoughts on stepper motors. i think to have one powerful enough would be quite expensive. remember you wont just need the motor, but a controller as well. in industrial applications they are ideal because of their accuracy. But here its not that neccessary. you dont need to get within 1/60 of a dgree or anything!