Reference
Charts and tools
Tables made to be printed and kept within reach, plus tools that do the arithmetic for you.
- Best rocks for tumbling: hardness chart and rocks to avoidHardness chart for 20 common tumbling rocks: Mohs value, whether each one polishes, which rocks can share a barrel and which to skip.Printable
- Rock tumbling grit chart: grit size, amount and time for each stageRock tumbling grit chart for all four steps: grit size, what each step does, days per step and how to tell it is done, plus about 2 tbsp of grit per pound.Printable
- Rock tumbler speed chart: RPM by barrel size and stageRock tumbler speed chart: rpm range for barrel diameters from 3 to 10 inches, published speeds for 6 hobby tumblers, and the dial setting for each stage.Printable