Best for achieving smooth finish on hard plastics.
Low Helix bits perform a more lateral movement with less upward or downward motion resulting in a smoother finish on single layer materials. These bits are a better choice for hard plastics such as acrylic and phenolic.
Down cut endmills shear in a downward direction causing the uppermost layer of the material to be pressed down against the material just below it. This motion leaves a perfectly clean top surface edge. A concentration of wood chips in the work path will occur. Hose away excess wood chips to prevent bit breakage.
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.