What are the formulas to calculate machine speed (RPM) and feed (F) for a 1.5" diameter tungsten carbide 5 tooth end mill when machining cast iron?
To calculate the machine speed (RPM) and feed (F) for a tungsten carbide end mill when machining cast iron, you can use the given formulas. Plugging the values into the formulas, the machine speed (RPM) is approximately 110.66 RPM and the feed (F) is approximately 0.02".
Formulas for Calculating Machine Speed and Feed
Machine Speed (RPM): RPM = (Cutting speed * 12) / (Diameter * π)
Feed (F): F = Feed per tooth (FTR) * Number of teeth (T)
Calculation:
Given the information provided:
Cutting speed = 550 FPM
FTR = 0.004"
Diameter = 1.5"
T = 5
Plugging these values into the formulas:
Machine Speed (RPM):
RPM = (550 FPM * 12) / (1.5" * π)
Feed (F):
F = 0.004" * 5
Simplifying the calculations:
Machine Speed (RPM):
RPM ≈ 110.66 RPM (rounded to 2 decimal places)
Feed (F):
F ≈ 0.02" (rounded to 2 decimal places)