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Surface Feet Per Minute (SFPM) = (Pi * Diameter * RPM) / 12
Diameter-inches RPM SFPM



Cutter Chip Load (CL) = Feed Rate (Inches Per Minute) / RPM / Number of Teeth
Feed Rate Inches Per Minute RPM Number of Teeth Cutter Chip Load




Inch / Millimeter Calculator
inches (1" = 25.4mm) millimeters (1mm = 0.03936")


Machining Terms & Formulas
Terms Formulas
IPM=Inches Per Minute IPR x RPM = IPM
IPR=Inches Per Revolution IPM / RPM = IPR
RPM=Revolutions Per Minute SFM x 3.82 / D = RPM
SFM=Surface Feet Per Minute D x RPM x .26 = SFM
D=Drill Diameter  

Monster Tool - Burr Monster - SA, SB, SC, SD, SE, SF, SG, SH, SJ, SK, SL, SM, SN Shapes and Mold, Tool and Die Making Carbide Burrs and Burr Sets. Single Cut, Double Cut and Aluma. All solid carbide, C-2 Grade Monster Tool - Drill Monster - Solid Carbide Twist Drills - Jobber Length, Spade Drills, Straight Flute Drill, Stub Drills and Center Drills. TiAlN / TiN Coating available Monster Tool - Mega Monster - High Performance End Mills and Rougher tools. Made from solid premium Micrograin C-2 Solid Carbide Monster Tool - Metal Monster - Solid Carbide Unground Blanks (1000 and 2000 series), STB Strips, Rod, Split End Blanks Monster Tool - Micro Monster - Miniature Decimal Endmills. 2 flute, 4 Flute, Square and Ball nose Regular and Stub lengths Monster Tool - Mill Monster - 2 Flute, 3 Flute Square and Ball nose, Stub, regular, long, extended lengths. Single end, double end, Corner Radius - 30 degrees helix, Right hand spiral, Right Hand Cutting Monster Tool - Ream Monster - Carbide Reamers in fractional, decimal, wire, letter and metric sizes Monster Tool - Tool Monster - HSS and Carbide Countersinks. Single Flute, 3 Flute, 6 Flute. In 60, 82, 90, 100 and 120 degree angles. Countersink sets available in a wooden case
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