Because the code uses absolute coordinates. Your machine has an origin, whereX=0 and Y=0.
G1 X6 will move it 6" in the positive direction
G1 X12 will move it 6" more in the positive direction
G1 X6 will now move back 6" in the negative direction
MOst machines are set up so that all the cutting is done in the positive direction, so no - are needed. It is possible, though, for your origin to be located anywhere on the machine.
__________________
Gerry
Mach3 2010 Screenset
http://home.comcast.net/~cncwoodworker/2010.html
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management) |