Pirotecnia Posted February 17, 2012 Posted February 17, 2012 This is a video i made with my first ball mill at work..hope you enjoy! Ball_Mill_Working.mpg
Pirotecnia Posted February 18, 2012 Author Posted February 18, 2012 its a tad fast, what diameter is the jar? about 3 inches
ribrown Posted February 18, 2012 Posted February 18, 2012 That thing looks very nice and compact, but definately way to fast. I have a 6" jar that spins at 73 RPM and filled with 1200 1/2" lead balls. Is there any way you can gear it down? I know some of the folks on here have RPM calculators and could give you the correct RPM, but my guess is that it should between 70 and 80 RPM. Nice job on the construction though.
Col Posted February 18, 2012 Posted February 18, 2012 3" jar should run at around 108rpm, make sure it has a 50% media charge first as that`ll help slow it down
JFeve81 Posted February 19, 2012 Posted February 19, 2012 3" jar should run at around 108rpm, make sure it has a 50% media charge first as that`ll help slow it down 108rpm seems fast to me. Do smaller diameter jars need to spin faster?
Col Posted February 19, 2012 Posted February 19, 2012 (edited) yep, the critical speed for a 3" jar is 167rpm, thats the point where the media sticks to the wall like a spin dryer. As a comparison, the critical speed for a 2ft barrel is only 55rpm, optimum 35.8rpm,6" jar critical speed is 113rpm, optimum 73.5rpm. Edited February 19, 2012 by Col
ch3mical0ne Posted August 18, 2013 Posted August 18, 2013 ive tried heaps of different fan type motos,they all seem to burn out,some kitchen supply motors burn out or something!i dont know much about electronic motors as im noob.would love if someone would helpe me out with a little info,would be much appreciated..thanks guys
Mumbles Posted August 20, 2013 Posted August 20, 2013 You want to look for a motor rated for continuous duty. It's also ideal if the motor is TEFC (totally enclosed fan cooled) or rated for use in explosive environments. Those two factors are mostly what you need to look for. You'll also need to find something that matches the phase you want (generally single phase), and the voltage you want. The RPM will be reduced and adjusted by the pullies, jar size, and roller diameter you choose. Getting something with enough power usually isn't a problem.
Col Posted August 25, 2013 Posted August 25, 2013 Water pumps are commonly fitted with TEFC motors. The rpm is generally quite high (2800-3500) so you`ll need more reduction. The silver lining is you`ll gain extra torque and theres plenty of cheap 1/2hp pumps on ebay.
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