Hello Waheed,

Monday, May 20, 2002, 2:35:29 AM, you wrote:

> Hello all,

> Whats a polygon good for?
Polygons are used to place a copper area (very often a small "ground plane")
on the board.

> Also what are Gerber,
Gerber Photoplot files will contain the instructions that a
photoplotter will use to plot the artwork necessary to produce your PC
boards.

>  NC Drill
NC (Numerically Controlled) Drill files are used by the PC maker's
drill to drill the holes in your board.

>  and Pick and Place files (CAM)
Pick and Place files would be used by a board assembly shop to
automatically place components on the boards.

When you have finished your board design, you will produce Gerber
photoplot files for each copper layer, solder mask, and silkscreen
layer, and an NC drill file, and send all these files off to the shop
that will produce the bare board.

If the board uses surface mount components, you will produce a Gerber
file for the solder mask layer, and provide that to the assembly shop
- they will get a solder paste screen made from that file, and use the
screen to apply solder paste to the board before placing the
components.

If the assembly shop uses auto-place machines, you can produce a Pick
and Place file for them.


-- 
Peter Bennett, VE7CEI    Vancouver, B.C., Canada
GPS and NMEA info: http://vancouver-webpages.com/peter 
Vancouver Power Squadron: http://vancouver-webpages.com/van-ps

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