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GENERAL FORMULAS
coolant pressure: 1 Bar = 14.5 Pounds per Square Inch (PSI)
calculation of coolant pressure: Pounds Per Square Inch (PSI) = (Horsepower of Pump x 1.460) / Gallons per Minute (GPM)
1 Liter = 0.254 Gallons
inch = millimeters / 25.4 millimeters = inch x 25.4
inch tap drill sizes = major diameter – ((1.299 x % of thread) / threads per inch)
metric tap drill sizes = major diameter – (1.082 x pitch x % of thread)
inch thread forming drill size: maximum diameter = basic major diameter – (3/8 x number of threads per inch)
inch thread forming drill size: minimum diameter = basic major diameter – (1/2 x number of threads per inch)
metric thread forming drill size: maximum diameter = basic major diameter – (.375 x pitch)
metric thread forming drill size: minimum diameter = basic major diameter – (.500 x pitch)
ISO H6 SPECIFICATIONS
DIAMETER
+
–
DIAMETER
+
–
≥ 1/8 - 3/16
0.00000
–0.00032
≤ 3
0,000
0,006
> 3/16 - 7/16 0.00000
–0.00035
> 3 - 6
0,000
0,008
> 7/16 - 5/8
0.00000
–0.00043
> 6 - 10
0,000
0,009
> 5/8 - 1
0.00000
–0.00051
> 10 - 18
0,000
0,011
> 1 - 1-1/4
0.00000
–0.00063
> 18 - 25
0,000
0,013
MACHINING FORMULAS
INCH FORMULAS
METRIC FORMULAS
sfm = rpm x .262 x cutting diameter
m/min = (3.14 x cutting diameter x rpm) / 1000
rpm = sfm x 3.82 / cutting diameter
rpm = (1000 x m / min) / (3.14 x cutting diameter)
feed (inches per tooth) = ipm / ( number of teeth x rpm)
feed (mm per tooth) = millimeters per minute / (number of teeth x rpm)
feed (inches / minute) = inches per tooth x number of teeth x rpm feed (mm/minute) = feed per tooth x number of teeth x rpm
feed (inches / minute) = ipr x rpm
feed (mm/minute) = mmr x rpm
feed (inches / revolution) = ipm / rpm
feed (mm per revolution) = mmr / rpm
cusp height* = (tool diameter / 2) – √(tool diameter
2
– pitch
2
) / 4
cusp height* = (tool diameter / 2) –√ (tool diameter
2
– pitch
2
) / 4
pitch = √4 x (cusp height x tool diameter) – 4 x (cusp height
2
)
pitch = √4 x (cusp height x tool diameter) – 4 x (cusp height
2
)
mrr – milling – (in
3
/min) = width of cut x depth of cut x ipm
mrr – milling – (cm
3
/min) = (width of cut x depth of cut x mm/min) / 1000
cutting time – drilling – (minutes) = length / ipm
cutting time – drilling – (minutes) = length / mm/min
sfm surface feet per minute
rpm revolutions per minute
ipm feed rate in inches per minutes
ipr
inches per revolution
mmr
millimeters per revolution
mm/min feed rate in millimeters per minute
mrr
material removal rate
*
on flat surface
KSPT Reference Information