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How much is a rock sand making machine?

Jan 23, 2021 STEP 1 - Coarse Grind. The first step of the four-step tumbling process is to run the rocks in the tumbler with coarse grit. We begin with a barrel that is about 2/3 to 3/4 full of tumbling rough then add two level tablespoons of coarse grit (we use 60/90 grit silicon carbide) for each pound of rock.

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