5.3 POWER CONSUMED IN CUTTING

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There are a number of reasons for wanting to calculate the power consumed in cutting. These numbers can tell us how fast we can cut, or how large the motor on a machine must be.

Having both the forces and velocities found with the Merchant for Circle, we are able to calculate the power,

We can relate the energy used in cutting to the mrr.

The cutting force will vary, thus changing Ps, as the cutting velocities are changed.

Tool hardness is degraded by temperature, as shown in the diagram below [REF]

The effects of rake angle on cutting are shown in the graph below, [REF ******]

The horsepower required for cutting can be found using empirical methods,

If we consider the implications these formulas have when cutting on a lathe, we would be able to develop the following equations,