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Wire Frame- All of the edges of the model are visible as solid lines. However, this image can be ambiguous, particularly for complex shapes. Therefore, various colors generally are used for different parts of the object to make it easier to visualize.

(Kalpakjian S., Schmid S.R., Manufacturing engineering and technology, p. 1196)

Point to Point System- Each axis of the machine is drive separately by leadscrews and at different velocities, depending on the type of operation. The machine moves initially at maximum velocity in order to reduce nonproductive time but decelerates as the tool approaches its numerically defined position. Thus, in an operation such as drilling a hole, the positioning and drilling take place sequentially.

After the hole is drilled, the tool retracts upward and moves rapidly to an other position, and the operation repeated. The path followed from one position to another is important in only one respect: It must be chosen to minimize travel for better efficiency. Point to point systems are used mainly in drilling, punching, and straight milling operations.

(Kalpakjian S., Schmid S.R., Manufacturing engineering and technology, p. 1157)

Solid Model- All surfaces are shown, but the data describe the interior volume.Solid models can be constructed from ''swept volumes''. In boundry representation (B-rep), surfaces are combined to develop a solid model. In constructive solid geometry (CSG), simple shapes such as sphere, cubes, blocks, cylinders and cones are combined to develop a solid model.

(Kalpakjian S., Schmid S.R., Manufacturing engineering and technology, p. 1197)

Interpolation- Movement along the path occurs incrementally by one of severall basic methods. In all interpolations, the path controlled is that of the center of rotation of the tool. Compensation for different types of tools, for different diameters of tools, or for tool wear during machining can be made in the NC program. There are 3 types:

. Linear interpolation

. Circular interpolation

. Parabolic interpolation

(Kalpakjian S., Schmid S.R., Manufacturing engineering and technology, p. 1158)