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# GATE Mechanical 1987 Question

During orthogonal turning of a steel rod by zero rake tool at feed $0.25mm/rev$ and depth of cut $2.0mm,$ the following observations were obtained. Tangential component of cutting force $=1000N$, Axial component of cutting force $=500N,$ chip thickness $=1.0mm,$ with the help of diagram determine the yield shear strength of work material under the given cutting conditions.

# GATE Mechanical 1987 Question

In a turning operation the tool life of the carbide tool was found to be $20min$ and $100min,$ at cutting speeds of $120m/min$ and $80m/min$ respectively. What will be the tool life of the tool under same condition but at a cutting speed of $100m/min.$

# GATE Mechanical 1989 Question

Uncut chip thickness $=0.25mm,$ Cutting speed: $60m/min,$ Tool rake angle: $0$ Chip thickness $0.75mm,$ Cutting force : $900$ $N$, Thrust force : $450$ $N$
The following data is available for machining a component on a turret or center lathe: find out the total number of components to be machined to justify the use of turret lathe 