How to Polish Rocks with a Bench Grinder (Ultimate Guide!)
WEBJun 17, 2022 · Make sure that water does not reach the motor of your bench grinder or it can become damaged and spark. 3. Hold the Rock with a Tool. You should use a clamp to hold the rocks so that they do not shake or fall when polishing them with a bench grinder. You can use pliers, but pliers are not highly recommended.