Is this a good idea for a improvised rock tumbler?

I had an idea after looking at my friends broken fan. I was thinking of ataching the rock tumbler barrel to the fan motor and puting it on the lowest speed. Do you think this will work and if it does i will post a instructable on it.

Try my rock tumbler.
I built this one for polishing brass bullet casings for reloading but it also makes a good rock tumbler with the right polishing media.
frollard5 years ago
Not a good idea. Fan motors are high speed low torque - a rock tumbler needs low speed high torque. If the barrel ran at the speeds a fan would go even on low, it would just make a centrifuge and all the contents would stick to the outside of the barrel.

What you need is a pulley or gear system to reduce the motor speed down so that it operates in the 60rpm range instead of 3000ish.

It's pretty common to only reduce it to say 500-1000 and have the barrel rest on a very small drive wheel/cylinder so the last reduction is taken care of by the circumference of the barrel.
iceng frollard5 years ago
What ever is built needs to be bullet proof reliable.
Some of my tumbles run weeks 24/7 at a time.

76543215 years ago
I actually made a ball mill using a fan motor. It worked pretty good. But, like frollard says, i used a setup that made the barrel go 60-70 rpm. Just attach it to a couple of thick dowel rods spaced apart kinda like this