These end mills have a single flute to cut plastics and wood very efficiently.
For the Onsrud end mills listed, here are the chip loads and suggested feed rates:
Soft Wood, Hard Wood, MDF (Medium Density Fiberboard), Soft Plywood, Hard Plywood (18,000 RPM):
Chip load: .002 to .004
Suggested Low End Feed Rate: 36 IPM
Suggested High End Feed Rate: 72 IPM
Soft Plastic (12,500 RPM) :
Chip Load: .002 to .003
Suggested Low End Feed Rate: 25 IPM
Suggested High End Feed Rate: 37.5 IPM
Hard Plastic (18,000 RPM):
Chip Load: .006 to .008
Suggested Low End Feed Rate: 108 IPM
Suggested High End Feed Rate: 144 IPM
Sheet Aluminum (16,000 RPM):
Chip Load: .002 to .004
Suggested Low End Feed Rate: 32 IPM
Suggested High End Feed Rate: 64 IPM