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Easiest Homemade Rock Tumbler
grit and water is added to the barrel along with the rock, as the barrel rotates this works a bit like sandpaper and smooths the rockyou start with coarse grit and work down to finer grit- make sure to thourerly clean the rocks and barrel after each stagefill about 3/4 full of rock, add enough water to just cover the rock, add some grit (google how much to use per KG) and spinfor each coarseness spin for 7 dayshope that helps!
i can imagine that a motor would be quieter (and cheaper) than a drill, and you could probably get one from the printerif you can figure out how, the speed can be reduced with gears (im working on this, my current idea is a worm drive attached to the motor output axis linked to a gear. to attach the gear to the structure, attach a thin, sturdy stick to the rubber rod and insert this through the centre hole of the gear and then through the drilled hole in the bucket)but yeah, this is a great project- cheep, functional and easy! hopefully im going to make this as soon as i get my hands on a printer