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In an orthogonal machining test, we have the following data: Chip width = 2.5mm Chip thickness after...

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Mechanical Engineering

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)       Calculate the mean shearstress on the shear plane

b)      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.

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