gearing down

[dragon finder]

ok i got a 1750 rpm motor for my ball mill but i need to gear it down to about 30rpm can any one help me!!!
P.S. horray for yard sales
<img src="http://tinypic.com/wknwaa.gif">

[saladtossser]

belts and pulleys are easy to do, but cover it up so u wont get your fingers jammed in

[jrrdw]

Looks like a swimming pool pump to me, probly 1/4 HP. Little gear on motor, big gear on machine, or just get any size gears/pulleys and set up a slipper clutch like on a rideing mower. The only problem with a clutch is you can only do lite work, plastic/soft metal, anything else will jam it up.

[dragon finder]

It's a 1/8 HP 1725 rpm (found the actual rpm) thrush water cerculator(sp?) pump. hopefully it will be powerful enough. I need aproximate pully diameters to get around 30 rpm Ihave no idea what the formula is. I have looked aroungd and come up with car gear ratios and not what I need (grrrrrr).

[Atlantis]

Radius Drive Wheel/Radius Other Wheel. I think.

[jrrdw]

If you double the size of the motor shaft, that will half the rpm's, so on and so on. Figure the machine the same way, do the math so the machine starts the same size as the motor shaft, then go from there, know what i mean? Write it all down from the get go so you don't get confused, it works for me when i have to do this sort of thing. Let me know how it works out for you. Maby even set up you math problems in out line from so labeling them will be easier.

[Benny]

jeez, how much did you get that for?

[dragon finder]

$7.00 dollers for the thing...and it works 8)

[boilingleadbath]

I beleive that with syncronous motors, the (in this case) 1725 rpm is it's rpm at rated load. With a ball mill - not a very hefty load - you can expect it to be much closer to 1800 rpm... not that that 5% really matters much, just pointing it out.

[dragon finder]

well the motor will have a 2" pully on it that will turn a 4" pully that turns a 1/2" rod that turns a 5 gallon bucket......sounds like it would give me around what i need.

UPDATE: May 13, 2005

i have the motor all hooked up and ready to use as soo as the frame is ready for the ball mill.

(i had to get the emergency cover and thats 300V wire^.=.^)