Buying guide
Set up the rock tumbling bench
Keep the manufacturer's service guide handy
Check the exact model's instructions for belt tension, bearing care and routine maintenance. Prepare tools that match the documented repair instead of using a generic belt or motor based on appearance.
Plan for separating the stages
Give each stage a clean container and a clear label. Use workbench tools dedicated to the job so a coarse abrasive is less likely to follow the stones into the finishing bowl.
Confirm what can be used again
The abrasive and the filler have different roles. Check the supplier's instructions for cleaning and reuse, and follow the machine manual for separating stones, media and used slurry.