For an orthogonal cutting operation, tool material is HSS,

For an orthogonal cutting operation, tool material is HSS, rake angle is 22°, chip thickness is 0.8 mm, speed is 48 m/min and feed is 0.4 mm/rev. The shear plane angle (in degrees) is

α = 22°
Chip thickness (t₂) = 0.8 mm
feed = 0.4 mm/rev
speed = 48 m/mm
For orthogonal cutting feed= thickness of uncut chip (t₁)

r =	t₂	=	0.8	= 2
	t₁		0.4

tabθ =	cosα	=	cos22	= 0.57
	r - sinα		2 - sin22

θ = tan^-1 (0.57)
θ = 29.7
Taper angle = tan^-1 (0.27) = 15.10