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<blockquote data-quote="RichJacot" data-source="post: 2838454" data-attributes="member: 40228">I&#039;m building a wet tumbler and I have everything I need except the large pulley.&nbsp; I&#039;ve used <a href="http://www.culvermotor.com/Engineering-Formulas/Pulley-and-RPM-Calculator.html" target="_blank">http://www.culvermotor.com/Engineering-Formulas/Pulley-and-RPM-Calculator.html</a> and I come up with the below.1725 -- 2 -- 7 = 492.86492.86 -- 1 -- 6.75 = 73.021725 rpm motor with 2&quot; pulley6&quot; PVC which is 6.75&quot; on the outside of the cap and reducer.3/4&quot; shaft for one side and 1/2&quot; shaft for the other (because that&#039;s what pillow blocks I had on hand).With the heater hose on the 3/4&quot; shaft it&#039;s 1&quot; OD (I&#039;d like to drive from the 3/4&quot; shaft).Now to get down to the 70 rpm range it &quot;appears&quot; that I have to use a 7&quot; pulley on the 3/4&quot; shaft.&nbsp; This seems to be much larger than others have been using.Can anyone confirm that I need a 7&quot; pulley or show me the error of my ways?Thanks!</blockquote>

[QUOTE="RichJacot, post: 2838454, member: 40228"] I'm building a wet tumbler and I have everything I need except the large pulley. I've used [url]http://www.culvermotor.com/Engineering-Formulas/Pulley-and-RPM-Calculator.html[/url] and I come up with the below. 1725 -- 2 -- 7 = 492.86 492.86 -- 1 -- 6.75 = 73.02 1725 rpm motor with 2" pulley 6" PVC which is 6.75" on the outside of the cap and reducer. 3/4" shaft for one side and 1/2" shaft for the other (because that's what pillow blocks I had on hand). With the heater hose on the 3/4" shaft it's 1" OD (I'd like to drive from the 3/4" shaft). Now to get down to the 70 rpm range it "appears" that I have to use a 7" pulley on the 3/4" shaft. This seems to be much larger than others have been using. Can anyone confirm that I need a 7" pulley or show me the error of my ways? Thanks! [/QUOTE]

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