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2-CAD/CAM Systems - Basic CAD & Screen Graphics
Basic CAD

A typical PC-based CAD/CAM system begins with a personal computer, laptop, or other device. This computer should have enough power and memory and must be properly configured to effectively run the software. An input device or two will also be required. Normally this would consist of a mouse and a keyboard. Output devices are also needed such as a printer or plotter to generate blueprints, CNC programs, and tool sheets or other necessary paperwork. The system would also include CAD/CAM software. Selecting the correct software to meet the requirements of manufacturing application is perhaps the most important aspect of your system.

Screen Graphics
2d drawings (right side above) take their roots from the drafting board as an orthographic representation. For sake of explanation we should acknowledge that this drawing has only two axis. It has an imaginary X axis running horizontally and a Y axis running vertically. The orthographic result can be explained as if one drew the front view on the front side of a box, the top view on the top of the box, and the right view on the right side of the box. The front and right view would be what you would see if you looked at the front view and the box was hinged so that you pull out the right view. The front and top view would be what you would see you looked at the front view and the box was hinged so that you pull up the top view.

3d (three dimensional) drawings (left side above) adds a third axis, the Z axis. This is something we could not do on the drafting board because there was no way to draw a line into or out of the drafting table. So taking a tip from artists we used the isometric drawing to express the three axis, X, Y, and Z.

But using a CAD system we can actually draw in three dimensional space and rotate the object around to see it in any view we wish even though the computer screen is flat with only two axis: X and Y.

-------------------------------- suggested links

How to draw an isometric sketch

Orthographic Projections

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