Reduction Gear Help

[akthor]

So I prematurely pulled the trigger on an electric motor with reduction gear and control box before really knowing what it was I needed to build my motorized grain mill. The reduction gear the motor came with is too reducing. I think its like at 30rpm? Which is too slow.

Well I phucked up so I gotta make this work. I guess I gotta buy a different reduction gear?

The motor is 1725 rpm so what reduction gear ratio am I needing?

 

[akthor]

I'm also not opposed to using pulleys and a belt if it's cheaper.

 

[paparker21]

please provide make and model or any other technical data you have for your motor. Or, if you're technically inclined but just lack a jumping off point:

http://en.wikipedia.org/wiki/Gear_ratio

 

[akthor]

Motor:
Manufacturer: Boston Gear
Cat.#: AST-B
Spec: 25E012W021
Frame: 42S
Hp: .05 TE
Volts: 115
Amps: 1.35
RPM: 1725
1-Ph
60 Hz
Class: F

 

[Swilldog]

Hey Akthor,

Hopefully this will help. Get on CHI company.net web page and click on "Link". There's a category called general purpose tools and click on, "pulley size/RPM/belt length calculator".

Cheers

 

[day_trippr]

Ah yes, I remember that thread.

Buying a reduction gear could be a painfully expensive solution. Pulleys and a belt would likely be much less aggravating to wallet and soul. Otoh, brass bushings aren't going to be all that pleased with the side loading.

Sorry 'bout all that...

 

[akthor]

So with a 2" pulley on the motor and a 12" pulley on the grain mill 12" centers I end up with 287.5 rpm is that about right?

If so where does one procure the pulleys and belt?

 

[beninan]

Make it ghetto looking with bike chain and sprockets! Put a spring loaded tensioner on the non-torque side. Also, unless you are planning to use a cog belt, with a v-belt you would need quite a bit of side force to prevent slipping. But with a chain you wouldn't have to worry about it slipping, you just have to worry about it jumping the sprocket.

 

[day_trippr]

McMaster-Carr?

Scroll down to the Power Transmission section...

Cheers!

 

[akthor]

Can someone with more knowledge check this to make sure I got it right and this is what I need to do.

So with a 2" pulley on the motor and a 12" pulley on the grain mill 12" centers I end up with 287.5 rpm is that about right?

If so where does one procure the pulleys and belt?

 

[Hang Glider]

2:12 = 1:6
1725 rpm / 6 = 287.5