Milling Parameter Abbreviations

Symbol	Designation/definition	Metric	US Customary
ae	Radial depth of cut	mm	inch
ap	Axial depth​ of cut	mm	inch
fz	Feed per tooth​	mm	inch
fn	Feed per revolution	mm/r	inch
n	Spindle speed	rpm	rpm
vc	Cutting speed	m/min	ft/min
ve	Effective cutting speed	mm/min	inch/min
vf	Table feed	mm/min	inch/min
hex	Maximum chip thickness	mm	inch
hm	Average chip thickness	mm	inch
kc	Specific cutting force	N/mm2	N/inch2
Pc	Net power	kW	HP
Mc	Torque	Nm	lbf ft
Q	Metal removal rate	cm3/min	inch3/min
KAPR	Entering angle	deg	deg