Question

Calculate machine speed (RPM) and feed (F) for a 2.5" diameter HSS slab milling cutter with 8 teeth (T) machining brass. Recommended cutting speed is 250 FPM. Feed per tooth (FTR) is 0.006".

A) RPM = 1250, F = 0.048"
B) RPM = 1000, F = 0.048"
C) RPM = 1250, F = 0.024"
D) RPM = 1000, F = 0.024"

Answer 1

To calculate the machine speed (RPM) and feed (F) for the HSS slab milling cutter, use RPM = (Cutting Speed * 12) / (Pi * Diameter) and Feed (F) = FTR * T formula. Given the values, the correct answer is option A) RPM = 1200, F = 0.048 inches.

Step-by-step explanation:

To calculate the machine speed (RPM) and feed (F) for the HSS slab milling cutter, we can use the formula:

RPM = (Cutting Speed * 12) / (Pi * Diameter)

Feed (F) = FTR * T

Given:
- Diameter (D) = 2.5 inches
- Teeth (T) = 8
- Cutting Speed = 250 FPM
- Feed per Tooth (FTR) = 0.006 inches

Using the formula, we can calculate:
- RPM = (250 * 12) / (Pi * 2.5) = 1200

- F = 0.006 * 8 = 0.048 inches

Therefore, the correct answer is option A) RPM = 1200, F = 0.048 inches.