[e1ioan]

Hi,

I build a small 2 axis Etch-A-Sketch CNC that accepts G00 commands to draw. I can draw with the mouse on the computer screen and then the Etch-A-Sketch will "print" the drawing.

The bottom left of the Etch-A-Sketch is X0 Y0 and the top right corner is X9500 Y6700.

I found a website that will convert any picture into G-Code: image to gcode: convert your images to gcode and I'm trying to understand how to make the commands created by that website to work with my 2 axis cnc.

Where does a CNC usually have the X0 Y0? Bottom left? Top left? I saw that some of the first commands when I tried to convert a picture were to go to a negative value... so if I start from a corner... negative will go out of the board.
Please help me better understand how G-code works.

Thanks.

PS: here is a video of the CNC Etch-A-Sketch:

https://www.youtube.com/watch?v=XtWJJ5csk-8

[Fletch_CNC]

I can't say for all machines, but I think most use the top right as machine zero. So all offsets (both X and Y) would be negative from there. And if you were commanding in absolute values, all coordinates would be negative.

Cool little device you built there!