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Tool Talk Discussion Forum

Re: drill press math

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Indiana Ken

07-25-2013 07:59:52

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The formula is: Output Rpm = Motor Rpm x (Driver/Driven) x (Driver/Driven) x (Driver/Driven).

Example 1) If you use a 1" pulley on the motor and a 12" pulley on the chuck we have; Output Rpm = 1725 x (1/12) = 144 Rpm at the chuck. As previously posted, 1" is a little small for a v-belt motor pulley - to prevent slippage you could go with a cog belt.

Example 2) Using a 3" pulley for the motor and the sprocket sizes you mentioned, we have; Output Rpm = 1725 x (3/12) x (22/45) = 211 Rpm for the shaft to which the 45 tooth sprocket is attached.

From your post I was not clear how the 30 tooth sprocket was to be used. If it is to form another gear reduction set then simply insert the (driver/driven) tooth ratio into the above formula.

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07-25-2013 11:05:55

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 Re: drill press math in reply to Indiana Ken, 07-25-2013 07:59:52  
Yes-if the 45 tooth drives the 30 tooth then there would be a 50% increase in RPM at this point

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