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Mechanical Engineering QUESTION #2458
Question 1
The module \(m\) of a gear in SI units is defined as:
  • Number of teeth per millimeter of pitch diameter
  • Pitch diameter in millimeters divided by number of teeth: \(m = d/N\)✔️
  • Circular pitch divided by \(\pi\)
  • Diametral pitch in inverse millimeters
Correct Answer Explanation
Module \(m = d/N\) (pitch diameter in mm per tooth). The relationships are: \(m = 25.4/P_d\) and \(p \cdot P_d = \pi\) (English); \(p/m = \pi\) (SI).