In an orthogonal machining test, we have the following data:
Chip width = 2.5mm
Chip thickness after cut = 1 mm
Cutting ratio = 0.25
Chip – tool contact length on the tool rake = 1 mm
Rake angle = -5 degrees (negative rake)
Cutting force = 900N
Thrust force = 900N
a)Â Â Â Â Â Â Calculate the mean shearstress on the shear plane
b)Â Â Â Â Â Calculate the mean frictionalstress on the tool rake
Make the calculations using the cutting ratio formula and thegeometry of the force circle; calculating the resultant force, theshear force on the shear plane and the area of the shear plane.Also, find the frictional force on the rake and the chip-toolcontact area.
