Find the feed rate of a 4-tooth cutter, using a 0.005 chip load, at a speed of 200 RPM.

Find the feed rate of a 4-tooth cutter, using a 0.005 chip load, at a speed of 200 RPM.

• A. 2 inches per minute
• B. 4 inches per minute
• C. 6 inches per minute
• D. 8 inches per minute

Answer: (B)

In milling, feed rate equals the chip load per tooth times the number of teeth on the cutter, multiplied by the spindle speed in RPM. Here, the chip load is 0.005 inches per tooth, there are 4 teeth, and the speed is 200 RPM. Multiply: 0.005 × 4 = 0.02; then 0.02 × 200 = 4. So the feed rate is four inches per minute. This demonstrates how more teeth, a larger chip load, or higher RPM increases feed rate. With these given values, you get 4 inches per minute; other option values would only fit if the chip load, number of teeth, or RPM were different.

In milling, feed rate equals the chip load per tooth times the number of teeth on the cutter, multiplied by the spindle speed in RPM. Here, the chip load is 0.005 inches per tooth, there are 4 teeth, and the speed is 200 RPM. Multiply: 0.005 × 4 = 0.02; then 0.02 × 200 = 4. So the feed rate is four inches per minute. This demonstrates how more teeth, a larger chip load, or higher RPM increases feed rate. With these given values, you get 4 inches per minute; other option values would only fit if the chip load, number of teeth, or RPM were different.