遼字石油化工大學⊙ 3. Operations: When one operator or a group of operators) works in a definite position (one machine tool or clipping table )to achieve the continous manufactruing of one or several parts simultaneously. An operation is the basic element of process procedure as well as of the production schedule and of cost estimation 200 Example1 B,s30 590 Fig. 6. 1 the engneering drawing of a shaft3. Operations: When one operator (or a group of operators) works in a definite position (one machine tool or clipping table ) to achieve the continous manufactruing of one or several parts simultaneously. An operation is the basic element of process procedure as well as of the production schedule and of cost estimation. Example1: Fig.6.1 the engneering drawing of a shaft