Question

Determine machine speed (RPM) and feed (F) for a 2.5" diameter HSS shell end mill with 8 teeth (T), machining aluminum. Recommended cutting speed is 550 FPM. Feed per tooth (FTR) is 0.010".

A) [RPM: 1760, F: 0.080"]
B) [RPM: 3520, F: 0.010"]
C) [RPM: 880, F: 0.020"]
D) [RPM: 440, F: 0.040"]

Answer 1

To determine the machine speed (RPM) and feed (F) for a 2.5" diameter HSS shell end mill with 8 teeth, use the formulas RPM = (CS x 12) / (pi x D) and F = FTR x T x RPM to calculate RPM and F, respectively.

Step-by-step explanation:

To determine the machine speed (RPM) and feed (F) for a 2.5" diameter HSS shell end mill with 8 teeth, we can use the equation: RPM = (CS x 12) / (pi x D), where CS is the cutting speed in FPM and D is the diameter of the end mill in inches. Plugging in the values, RPM = (550 x 12) / (pi x 2.5) = 1760 RPM (approximately).

To calculate the feed, we can use the equation: F = FTR x T x RPM, where FTR is the feed per tooth and T is the number of teeth. Plugging in the values, F = 0.010" x 8 x 1760 RPM = 0.080".

Therefore, the correct answer is A) [RPM: 1760, F: 0.080"].