<p>Check out <a href="http://automationdirect.com">automationdirect.com</a><br>
Alex</p>
<div class="gmail_quote">On 2013-02-13 12:25 AM, "David G. LeVine" <<a href="mailto:dlevine@speakeasy.net">dlevine@speakeasy.net</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<div>On 02/12/2013 01:30 PM, Frank Shields
wrote:<br>
</div>
<blockquote type="cite">
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Building
equipment for determining the hardness of pellets and biochar
I need something to turn a 9 kg box at a speed of 60 RPM +/-
1.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I
have a 1/3<sup>rd</sup> HP motor that is rated at 1725 RPM<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Fitted
with a 2” pulley attached to the motor and going to an 8”
pulley gives me a shaft turning 431 RPM<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Then
another 2” pulley going to an 8” pulley on another shaft gives
me 108 RPM<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I
plan to adjust the 108 down to 60 using a voltage regulator. <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Is
this a good plan? <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">And
is there another factor I need to include for the weight of
the box I am turning?</span></p>
</blockquote>
<br>
This is a BAD plan.<br>
<br>
Your motor is probably speed controlled by line frequency, not
voltage. Cutting the voltage may or may not help, in fact, it can
fry the motor if the centrifugal switch does not kick out.<br>
<br>
Get a 3 phase motor and a VFD and it will work well., but figure
$100-$200 MINIMUM for the VFD. The 3 phase motor will be fairly
cheap.<br>
<br>
Dave 8{)<br>
<div>-- <br>
<br>
<br>
<em>"Among the many misdeeds of British rule in India, history
will look upon the Act of depriving a whole nation of arms as
the blackest."</em><br>
<br>
Mohandus Ghandi, An Autobiography, Page 446.<br>
</div>
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