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Best for achieving smooth finish on hard plastics.
Low Helix bits perform a more lateral movement with less lift resulting in a smoother finish. These bits are a better choice for hard plastics such as acrylic and phenolic.
Up-cut endmills direct chips up and away from the milling area leaving an unobstructed path for the endmill. Bit breakage is less likely.
Pros: Produces smooth finishes on hard plastics,
Cons: Low helix bits require a slower feed rate than "high helix" router bits.
For use in CNC milling and carving machines.