$\theta$	Angular position (°)
${\theta }^{*}$	Dimensionless angular position
a	Depth of cut (mm)
$A_{cg}$	Section cut by a grain (mm${}^2$)
$b_g$	Width of grain during cutting (mm)
$C_g$	Grain number per unit area (mm${}^{-2}$)
$d_g$	Grain diameter (mm)
$D_M$	Diameter of the grinding wheel (mm)
f	Feed per grain (mm)
h	Undeformed chip thickness (mm)
k	Constant of proportionality
$l_c$	Contact length between wheel and workpiece (mm)
$l_g$	Distance between grains (mm)
$N_g$	Number of grains
P	Total power consumption (W)
$P_{ch}$	Power consumption by chip formation (W)
$P_{pl}$	Power consumption by ploughing (W)
$P_{sl}$	Power consumption by sliding (W)
$P_v$	Idle power consumption (W)
$Q_w$	Material removal rate (mm${}^3$/s)
$R_g$	Grain radius (mm)
$R_M$	Radius of the grinding wheel (mm)
$SCE$	Specific cutting energy (J/mm${}^3$)
$SEC$	Specific energy consumption (J/mm${}^3$)
$SE{C}_{ch}$	Specific energy consumed by chip formation (J/mm${}^3$)
$SE{C}_{pl}$	Specific energy consumed by ploughing (J/mm${}^3$)
$SE{C}_{sl}$	Specific energy consumed by sliding (J/mm${}^3$)
$v_c$	Peripheral cutting speed (m/s)
$v_w$	Speed of workpiece (m/s)