Question

The diameter and rotational speed of a job are $100m$ and $500rpm$ respectively. The high spots (chatter marks) are found at a spacing of $30deg$ on the job surface. The chatter frequency is

• A. $5Hz$
• B. $12,Hz$
• C. $100Hz$
• D. $500Hz$

Answer 1

The correct option is C $100Hz$

$\text{Chatter marks a}{30}^o\text{on the job surface}$

$\text{Chattering in a revolution}\left({360}^o\right)$

$=\frac{{360}^o}{{30}^o}=12$

$\text{Speed, N}=\frac{500}{60}=\frac{50}{6}rev/sec$

$\text{Chatter frequency}=\frac{50}{6}\times 12=100Hz$