With regard to the central part, the actual state of coordinate axis is analyzed first, then the theory ofthe projection method is introduced. On the basis, the method of identifying coordinate origin ispresented.

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Once the Device Context has been initialized, the origin of the coordinates is usually the upper-left corner of the output rectangle, while the x coordinate axis is horizontal right and the y coordinate axis is vertical downward, with both using pixel as unit.

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System speaking of the Master CAM, first must establish the components the geometry model, according to the components actual size, draws its processing part the contour line, does not need to draw the entire components the model, guaranteed the computation production the cutting tool way coordinates accuracy, and may use the Master CAM Chinese Library level the function, when determination cutting tool way, transfers or the hideaway, the selective treatment needs contour line; Next, the formulation processing craft and the definite craft parameter, chooses the cutting tool, the processing semi finished materials, the work piece origin of coordinates again and so on, establishes the work piece coordinates system, definite work piece coordinate system and engine bed coordinate system relative size, thus obtains the components processing correct cutting tool way; Finally, the simulation function which system provides using the Master CAM, the realization simulation processing.

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