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motor advice for rotating crt setup
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bluevolume:
I saw a thing on the History Channel about how the thrusters in the Harrier work, and this might be a good idea for this project.  Adding gear notches around the monitor mount and running a chain to the motor.  Probably a lot more work but you would get pretty reliable performance out of it.  If it works with 21,000 pounds of thrust, it should work with a 60 pound monitor.  ;D
Anubis_au:
Jimbo, I've was having this very same discussion with my mech eng friends and the propeller heads at work today.

The top three suggestions that have come about are:

1. the motor connected to a caster wheel driving the rotation via friction. but, have the caster 'horizontal' under the rotating plate

2. motor with a cog married to a strip of cogs that's stuck on the outside of the circular plate. problem is where if anywhere to get this cogged strip. Worst case: get it laser cut at a perspex cutter etc (ie not cheap).

3. use a bike gear connected to a bike chain which is nailed to the outside of the circular plate.

In all three cases, these are suggestions put to me as how to couple a motor to the circular plate to achieve the desired rotation. No-one suggested anything about where to source said motor, but this thread has now revealed some ingenious sources (drill/screwdriver, electric window).

Don't forget Jimbo, I'm right behind you in terms of designing a rotating monitor cab. So good luck and don't fofget to share any of your findings. I for one, am watching *very* closely!!
danny_galaga:
ok, ive done it on a smaller scale (15" crt) so i have some thoughts (",) . i myself would go for a cordless drill. set it up so that it can remain trickle-charged. thus all the 'grunt' work is done by the battery- no need for a huge transformer. this is what i will do if i ever build another rotator. mine being much smaller i was able to get away with an electric screwdriver sized motor. whatever you use will need to be geared and guess what? the drill will be just about right! i say forget about using AC motors. too big and complicated (and more chance of getting zapped somewhere along the way).

the other thing ive seen done is this on a 19" cocktail:

http://web.archive.org/web/20021016113027/http://home.attbi.com/%7Eelsmith2000/MAMECAB.htm

as you can see he's dropped off the radar, but wayback has some pics at least. im not sure what 12v motor he is using but i have heard somewhere that an electric window winder works well. again its already geared down.

about degaussing. being a pc monitor, mine degausses when its turned on and off. so when it rotates in my cab, i have it wired so that the monitor switches off while rotating. i dont know if they have anything built in on arcade monitors (i cant imagine the need for it).

edit: oh, and if you check out my machine, you'll see im quite partial to the exact drive setup you envisage! i used a wheel off a 1/12 rc car driving directly againt the ply turn table. i later added a thin foam strip to help with friction. i like this setup because if something goes wrong it will just slip rather than break something or burn something...

the gear ratio on mine pretty low. forgotten now, but including the roughly ten to one of the wheel to turntable ratio, it was in the hundreds to one. needs to be. if you have the power, and you had it spinning fast imagine the inertia on the monitor. a lot of un needed stress.

ooh, just remembered. heres mine spinning. i think its an acceptable speed. it allows for degaussing but also allows the 'oooohhhh!' fact to set in (",)

urbecrisch:
To be honest I'm generally not a big fan of the rotating monitor, but this looks absolutely ****ing awesome.  Great build!
Lilwolf:
for gearing down, couldn't you go and buy an old bike from a second had store?  Seems like it would be a good, solid and cheap way to do it.

And I love the idea of using an old drill.
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