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Ball Mill
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Harbor Freight rock tumbler conversion.
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- Creative Commons — Attribution — Noncommercial
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This is a conversion of the Harbor Freight (Central Machinery) 6lb dual drum tumbler. You will need these parts from it:
- 1x 3lb Drum
- 1x C-Frame motor /w 2x aluminum mounting blocks
- 4x Motor screws
- 1x Power cord /w grommet
- 1x Power switch
- 4x Rubber Feet
- 1x V-Belt
Parts that need to be bought (all of this can be had at Amazon.com, buy a few spares!)
- 2x 10x200mm Linear Rods
- 4x 10mm Pillow Block Bearings
- 1x 3/8" ID 9/16" OD Latex tubing (1M length)
- 1x 40x20mm 12v Fan
- 1x 120v AC to 12v DC converter
- 2x 221-413 WAGO lever nuts (3 conductors per nut)
- 8x M5x10mm Round Head Screws
- 13x M3x8mm Cap Head Screws
- 14x M3x6mm Cap Head Screws
- 8x M5x5.8mm Heatset Inserts (Ruthex M5S)
- 31x M3x4mm Heatset Inserts (Ruthex Voron)
- 1ft 18-22awg silicone wire
- 2x blue (18-22awg) spade crimp terminals
- 2x 1mm x mini zip-ties (100-200mm)
3D Printed parts are as follows:
- ~800g PETG or better filament (plastic will be subjected to ~60c motor temp)
- 1x Frame
- 1x Top cover
- 1x Bottom cover
- 1x Fan grill
- 1x WAGO distribution mount
- 1x Motor pulley
- 1x Large pulley
- 2x Drum stops
This design spins at 95 RPM compared to the stock 45 RPM. This is optimal for milling fine powder. The stock speed is more for polishing rocks. This conversion runs much more quiet than stock and has a built in fan to help cool the motor.