Mine runs at about 20 and does a good job. Bob Ehrenberger Shelbyville, Mo From: "Shannell Sugrue" <[email protected]> To: <[email protected]> Date: Mon, 16 Sep 2002 13:19:05 +0930 Subject: [TheForge] Tumbler rpm Reply-To: [email protected] Whats the optimum rpm for a tumbler to remove scale? Im about to buy some pulleys and need to do the calcs to get my desired speed