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motor advice for rotating crt setup
danny_galaga:
--- Quote from: ahofle on October 09, 2007, 12:28:16 pm ---
--- 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?
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thanks :) . it uses limit switches. works well at that size but if you have a look at how ive done it here:
i just use microswitches. the monitor turn table has a leg that hits one or the other. thing is, physically thats all that stops it! so eventually i imagine a switch will break. in this case easy to fix with just a bit of foam rubber on each switch lever.
danny_galaga:
--- Quote from: Cornchip on October 09, 2007, 06:13:55 pm --- 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.
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i had forgotten about that. but you are getting me to think again ofr the first time in ages (",) . i had a thought and i reckon this is what id do if it needed to be a positive (as opposed to frictive) drive.
get a piece of bike chain and attach it so it goes around the circumference of the turn table. you only need a bit over 90 degrees. have a sprocket on the drive motor. and thats it!
danny_galaga:
--- Quote from: DaOld Man on October 09, 2007, 09:52:20 am ---
--- 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.
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hehe. i guess i wasn't paying attention...
Anubis_au:
I never wrote explicitly that you only need 90 degrees or so of chain on the circumference, but its obvious to all.
Seems this solution is gaining popularity... now we just need a tester...
The only problem I see with this solution over others, is that the bike chain adds to the circumference of the circular plate, which means your cab is even wider than it was with just a circular plate. the friction-based caster-roller solution, for example, avoids this.
Thinking out loud though, you could do a two-layer solution like Jimbo, with the second layer slightly smaller than the first, and the chain connected there, thus not adding extra to the circumference... that would mean one part of the plate would not have casters holding the plate up.... would that introduce instability to the plate mechanism?
patrickl:
Wouldn't a bike chain give the monitor too much room to wobble?
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