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Hobby CNC
Hobbyists get into CNC for many different reasons.  It really has a lot to offer as a hobby.  There are many challenges to it and that is what draws in many people.  This is not something you do just to pass the time.  There is a result in mind.
Some people make it to Hobby [...]

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CAD (Computer-aided design)
Geometry authoring tool that involves software and sometimes special-purpose hardware. Current packages range from 2D vector based drafting systems to 3D solid and surface modellers.

CAM (Computer-aided manufacturing)
Considered as an NC programming tool wherein 3D models of components generated in CAD software are used to generate CNC code to drive numerical controlled machine [...]

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By Eric Dykstra

Not long ago CNC (which stands for computer numerical control, by the way) machines were so expensive that only large companies could own them. But we’re in the middle of a full-fledged CNC revolution, reaching all the way down to the grassroots level. Now a dedicated average Joe whip up a precise fabricating [...]

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The operators of the present-day CNC cutting machine demonstrate many of the same skills as those possessed by various traditional craftsmen. The operators of the CNC cutting machine include the men and women who design and make cabinets, woodwork, signs, and a whole range of metal, solid surface and plastic objects. The manufacturers who employ [...]

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Design - thinking and planning what you want to build
CAD - translating it into the computer
CAM - converting it into machine language
Controlling - directing your machine’s motion
Machining - building the part to specifications
 
These five elements are really the building blocks to a CNC project.  As you see them above, that is generally the order people [...]

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