Slow down motors

[laserpyro]

I'm planning on building a lumia wheel laser show but all my motors spin way to quick just wandering how to slow them down, im speak like 1rpm slow.

 

[bobhaha]

gear it down.. i used macano gears for a school project, but i was going for torque rather then speed.. go to a local hobbie shop see what types of gears motors etc are avalible..

hope that helped -Adrian

 

[Flaminpyro]

I recently bought a 3 rpm 120volt motor, I'll have to find the receipt if your interested in knowing where I got it, can't rember but think it was around $9.00 + shipping.

Peace Pyro... :eg:


PS what's a lumia wheel ? something like a light wheel.

 

[Jaseth]

As bobhaha said, gears are probably your best bet.
It would work in this way: A small cogwheel is attached to the motor.
This cogwheel turns a large cogwheel, and as you can imagine the RPM of this large one is now much lower because the small one has to turn many times to turn the large cogwheel a single time.

If you want it even slower, attach a thick rubber band to the middle pin holding the large cogwheel, the other end of the rubber band around the pin holding A NEW small cogwheel. Then make this small one turn a larger one like before. This can be repeated as many times as you want to make it extremely slow.

I will draw up something quick to let you know exactly how:

 

[laserpyro]

PS what's a lumia wheel ? something like a light wheel.

this is basically what im building http://laserpointerforums.com/f42/simple-spiro-lumia-wheel-build-41289.html but i also need a slow one for a chrystal ball project i am attempting. thanks jaseth + bobhaha ill be doing that.

 

[Bionic-Badger]

You'll definitely need gearing for speed as slow as that, but you can also control the speed of the motor itself using pulse width modulation (PWM) with something like an HBridge (depending on your motor type).

Another option is to just buy a continuous servo and use that instead of a motor. You can them them (and gears too!) at Servo City.

 

[lasersbee]

As bobhaha said, gears are probably your best bet.
It would work in this way: A small cogwheel is attached to the motor.
This cogwheel turns a large cogwheel, and as you can imagine the RPM of this large one is now much lower because the small one has to turn many times to turn the large cogwheel a single time.

If you want it even slower, attach a thick rubber band to the middle pin holding the large cogwheel, the other end of the rubber band around the pin holding A NEW small cogwheel. Then make this small one turn a larger one like before. This can be repeated as many times as you want to make it extremely slow.

I will draw up something quick to let you know exactly how:

There is only one small problem with your drawing.....

The Rubber band pulleys.... the pulley on the Motor side MUST be SMALLER
than the Pulley on the opposite size if you want the speeds to slow down...
The way you have it drawn... the speed of the Geared sections slows
the next shaft
down but the rubber band pulleys speed it up...

[EDIT]
They even have Gear Motors on that Servo Site that BB pointed to....

http://www.servocity.com/html/3-12v_gear_motors.html


Jerry

 

[Jaseth]

Yeah thanks for pointing that out Jerry, I did the drawing in about 1 minute so I forgot to make the pin in the 2nd small cogwheel as big as on the big one.

Helpful as always

Seb

 

[lasersbee]

Actually if you want to make it slow down even more... make it as large as possible..
and the one on the Motor side... as small as possible...

Jerry

 

[rog8811]

I have adapted R/C servos to make speed controlable rotary geared motors. You need to remove the pot that controls the position and on some servos there is a little tag to remove on one of the gears, then the output shaft will go right round.

Regards rog8811

 

[laserpyro]

ok this is what i have made. i used a tape player as it already had all the gears + a 9v battery + a lacky band. as u see i used a chrystal ball instead of doing the lumia wheel effect seeing as i dont have any circular pieces of glass. id show the effect but the camera doesnt show much, because i have only 5mW greeny and camera phone

 

[Flaminpyro]

Here is a pic of what I cobbled up in a short time a while back it looks realy good with a PRG running through it !

Peace Pyro... :eg:

 

[laserpyro]

you find that receipt FlaminPyro?

 

[chipdouglas]

also laserpyro, go to toys r us or similar and get a kids disco ball. they are set up for like 4 rpm

@flaminpyro, what is that a pic of?

 

[Flaminpyro]

also laserpyro, go to toys r us or similar and get a kids disco ball. they are set up for like 4 rpm

@flaminpyro, what is that a pic of?

It's a crystal ball mounted on a 4 rpm 6-18 volt gear head motor mounted in an upside down flower pot painted black there is a 6 volt Lipo pack and a sw inside the pot. in the pic there is a PHR beam shinning on the ball but is is not turning as I didn't want to chance my screen pixels...


Best Regards Pyro... :eg:

 

[chipdouglas]

Nice!!!