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BASIC FORMULAS (Inch)
E xternal Threading Internal Threading
GRADES A
B
INSERTS C
E
CBN & PCD F
G
TURNING H
J
Surface Speed per Minute Time in Cut (seconds) BORING L
T = 60 LOC NO. OF PASSES M
SFM= 0.262 DIA RPM IPR RPM P
R
Revolutions per Minute Feedrate T
3.820 SFM Standard Threads
RPM= DIA GROOVING
Feedrate (inches/minute) IPR= 1
TPI
IPM= IPR RPM
Metric Threads
IPR = Pmm CUT-OFF
25.4
D efinition of Terms LOC = Length of Cut (Inches) THREADING SOLID END MILLS
Q = Metal Removal Rate (Cubic Inches per Minute)
DIA = Diameter of the Workpiece (Inches) RPM = Revolutions per Minute MILLING
DOC = Depth of Cut (Inches) SFM = Surface Speed (Feet per Minute)
EFF = Machine Efficiency T = Time (in Seconds) SPARE PARTS
f = Feedrate (See IPM and IPR) tchip Max = Maximum Recommended Chip Thickness (Inches)
HPM = Horsepower Required at the Motor UHP = Unit Horsepower Factor TECHNICAL
HPS = Horsepower Required at the Spindle 1 = Lead Angle
IPM = Feedrate (Inches per Minute)
IPR = Feedrate (Inches per Revolution) INDEX
IC = Insert inscribed circle (inches)
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