1 - Chandler Unified School District

May 18, 2011 · These machines transform rotational energy by changing position, rotational directions, speed and torque. ω is rotational speed (rpm) τ is torque (in lbs or Nm) Gear Ratio (GR) = Number of teethout / number of teethin. = No/Ni. GR = No/Ni = Do/Di = τo / τi = ωi / ωo. Sprockets use chains: noisier, more expensive, stronger, need lubrication ................
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