MAYDOWN FORMULAE FOR MILLING CALCULATIONS
 Key for formulae: D = Diameter of cutter T = Number of teeth rpm = Revolutions per minute F = Cutter feed (or table traverse) FT = Feed per tooth S = Peripheral speed of cutter π = 3.1416 HP = Motor horsepower C= Machinability constant
 TO CALCULATE CUTTER SPEED S (ft / min) = D x π x rpm = 0.2618 D x rpm 12 S (m / min) = D x π x rpm 1000

 TO CALCULATE FEED PER TOOTH FT = F T x rpm
 TO CALCULATE CUTTER REVOLUTION rpm = S (ft / min) or S (m / min) x 1000 0.2618 D D x π

 TO CALCULATE CUTTER FEED (TABLE TRAVERSE) F = FT x T x rpm
 HORSEPOWER HP Power requirements: Horsepower required can be calculated using the following formula which is based on a metal removal rate of one cubic inch per minute per horsepower. The machinability constant 'C' allows 25% for cutter dulling and 60% power efficiency at the cutter spindle. HP = Depth of cut x width of cut x T x FT x rpm = Depth of cut x width of cut x F C C Kilowatts = HP x 1.34 Machinability Constant 'C' =    Aluminium and soft alloys = 4.0,    Grey cast iron = 1.5,    Steel up to 300 HB = 0.6,    Steel up to 400HB = 0.5,    Brass (duplex) = 2.5,    Low Carbon steel = 1.0,    Bronze = 2.0
 TO CALCULATE AVERAGE CHIP THICKNESS = Feed per tooth x √ cutting width cutting diameter

 TO CALCULATE METAL REMOVAL (cubic) = Feed x depth of cut x width of cut
G9

# MAYDOWN FORMULAE FOR MILLING CALCULATIONS

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