##
4.6 Cutting Power

• 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.

• 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,