Topic: Manufacturing Processes
In face milling with a cutter of 100 mm diameter, if the cutting speed is $1~m/s$, what should be the spindle speed (rpm)?
- A. 190
- B. 150
- C. 180
- D. 120
Answer: A. 190
Explanation: Cutting speed $V = \frac{\pi D N}{60}$ where $V$ is in m/s, $D$ is in meters, and $N$ is in rpm.
$V = 1~m/s$, $D = 100~mm = 0.1~m$.
$1 = \frac{\pi \times 0.1 \times N}{60}$.
$N = \frac{60}{0.1\pi} = \frac{600}{\pi} \approx 190.98~rpm$. The closest option is 190.