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    BruJan's Avatar
    BruJan Posts: 38, Reputation: 1
    Junior Member
    		  
    #1

    Sep 11, 2011, 05:00 PM
    Making a rock tumbler
    I am making a rock tumbler and am a little perplexed as to how fast the "barrell" should turn. I will be using barrels of 5 1/2 inch and 6 1/2 inch. Anyone have any ideas on about the best RPM for general purpose smoothing? I do not have a variable speed motor available.
    cdad's Avatar
    cdad Posts: 12,700, Reputation: 1438
    Internet Research Expert
    		  
    #2

    Sep 11, 2011, 05:48 PM
    Here is one suggestion.

    Tumbling is an economical finishing process because large batches of parts can be run with little or no supervision by the operator. A full cycle can take anywhere from 6 to 24 hours with the barrel turning at 20 to 38 RPM.

    Ref:
    Tumble finishing - Wikipedia, the free encyclopedia

    Another good source is :

    GemWorld-TUMBLING INSTRUCTIONS
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