Cutting speed is the term used to express the velocity of the tool (SFM = surface feet per minute) as it cuts a specific material. Each material has an optimum range for its machinability with each cutting tool material (i.e. H.S.S. vs. carbide, etc.)
Use the following formula to compute a tool's cutting speed:
Where:
- SFM = surface feet/minute
- D= tool diameter in inches
- RPM = revolutions/minute
Rotabroach Cutter
SFM = .262 x diameter x RPM
Conventional Drill
SFM = .262 x diameter x RPM
Rotabroach Cutters provide a nearly constant tooth pitch. This pitch provides consistent tool life patterns for the entire range of diameter sizes in terms of lineal inches (inches of drill penetration).
