At 02:35 PM 5/20/2002 +0500, Waheed Bajwa wrote:
>Whats a polygon good for?

For filling an area of a PCB with copper. Also called a "copper pour." 
Properly set up, the inside of the polygon will fill with copper (track) 
except for clearances as determined by the appropriate design rules around 
pads, via, and other primitives not belonging to the same net as the polygon.


>  Also what are Gerber, NC Drill and Pick and Place files (CAM)

Gerber: standard file format for photoplots. Gerber was originally devised 
to control mechanical photoplotters that drew with light by moving an 
aperture (an opening for light to pass through) over a film (actually, the 
film was usually moved, not the aperture, same difference; conceptually it 
was the aperture that was used to draw.). The original gerber used a 
separate aperture list; the early plotters only had relatively few 
apertures on a wheel.

RS-274X gerber added more sophisticated commands and features, the most 
notable of which is embedded apertures, so that no extra aperture table is 
necessary. Protel will generate one anyway....

NC Drill: This is a file with tool (drill) sizes and positions, for 
controlling a Numerically Controlled drilling machine. The format is called 
Excellon from one of the manufacturers. There are also other formats.

Pick and Place: A file with the position of all components and their 
rotations, for use with automated assembly (pick-and-place) machines.

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