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Topics - grouchy

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General Mach Discussion / basic questions by newbie
« on: October 13, 2014, 11:40:01 AM »
I'm thinking of buying a small mill/engraver and have started playing with the demo versio9n of mach3 and have some basic questions.
I'm running mach3 without a machine connected, parallel port disabled.
I Have a small gcode program that is a 1" square. It goes like this:
G20
G91
G41 D125
T1 M6
F10
M3
M8
G1Z-.5
G1X1.0
G1Y-1.0
G1X-1.0
G1Y1.0
M9
G1Z.5
M5

I start mach3 and hit reset, then load the cnc file. I turn on machine co-ord's and referece (zero) all axis, turn off mach co-ord's., then hit cycle start.
Watching the program run, z axis goes down half inch, but watching the DRO's, the x axis doesn't go to 1", only makes it to .9830", the y axis goes all the way to 1.000"
Why does the x dro stop at .9830"?

Shouldn't the dro's actually indicate movement of 1.125", since I have programmed a G41 D125 ? I also have tool1 set as diameter .125"

Hopefully soon I'll have a machine connected and buy a licence. I hope this forum is the right place to ask these questions.




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