248) In ______operation, the chip thickness is minimum at the beginning of the cut and it reaches to the maximum when the cut terminates.

Answer is:

conventional milling

Explanation:

Up Milling The process of removing metal by a cutter which is rotated against the direction of travel of the workpiece is called up-milling. It is also called conventional milling. In up-milling, the chip thickness is minimum at the beginning of the cut and maximum at the end of cut. The cutting force varies from zero to maximum.

Down Milling The process of removing metal by a cutter which is rotated in the same direction of travel of the workpiece is called down milling. It is also called climb milling. In down milling, the chip thickness is maximum at the beginning of the cut and minimum at the end of cut. The cutting force varies from maximum to zero.

In ______operation, the chip thickness is minimum at the beginning of the cut and it reaches to the maximum when the cut terminates.

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249) In ______ operation, the cutting force is maximum when the tooth begins its cut and reduces it to minimum when the tooth leaves the work.

Answer is:

down milling

Explanation:

Up Milling is the process of removing metal by a cutter which is rotated against the direction of travel of the workpiece is called up-milling. It is also called conventional milling.
In up-milling, the chip thickness is minimum at the beginning of the cut and maximum at the end of cut. The cutting force varies from zero to maximum.

Down Milling is the process of removing metal by a cutter which is rotated in the same direction of travel of the workpiece is called down milling. It is also called climb milling.
In down milling, the chip thickness is maximum at the beginning of the cut and minimum at the end of cut. The cutting force varies from maximum to zero.