designing of router machine

Hi there,

I'm new in the google group. I saw this electronic design group
anddecided to ask some questions on design I'm currently making.

I'm designing a PCB routing machine. The machine has to accept gerber
files in 274X formate. I've downloaded this (
http://members.optusnet.com.au/~eseychell/rs274xrevd_e.pdf ) tutorial
about gerber files and read it all and tried to decode some gerber
file by my self which I acctualy succeded to.

My problem is this. While decoding the gerber files I realized that
when the gerber code tells u to draw a line, it actualy tells you (or
the router bit) to pass directly on the line and not arround it. In
other word, it is like if the polarity of the pcb is inverted.

please guid me on this! I wish I could know wht to do?

.

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