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lathe , the selection of the motor, the selection and check of the ball pole and the theoretic calculation of the size of the cone gear wheel.

CONCEPTUAL DESIGN: It introduces the main points and requirements of the design of the drive parts, and puts forward the design of the horizontal and portrait give parts.

THE DESIGN OF HARDWARE CIRCUIT: The election of the hardware and the connection of circuit are explained at length.

In view of the flaws of the design, it puts forward some measures to make impovement. Besides, a conclusion of this graduation project and prospect of the development of precise machine are given in this part.

Keyword: plane grinding machine , numerical control, portrait give, horizontal give