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Mechanical Engineering QUESTION #2462
Question 1
The spring index \(C\) of a helical spring is defined as:
  • \(C = d/D\)
  • \(C = F/\delta\) (spring stiffness)
  • \(C = D/d\) where \(D\) is mean coil diameter and \(d\) is wire diameter✔️
  • \(C = N_a d / D\)
Correct Answer Explanation
The spring index \(C=D/d\), where \(D\) is the mean coil diameter and \(d\) is the wire diameter. Typical values are \(4 \leq C \leq 12\).