I wouldn't worry too much about backlash. Making a robust machine that can handle the heavy loads for metal cutting would be a major task.
I had started adding a sensor to detect the position of the chuck so as to synchronize the feed for screw cutting - but like a lot of my things the need evaporated before I got that finished It seems to work properly but I have actually used it very little. And I wrote a Python program for my PC to allow manual control and to interpret simple GCode and convert it to numbers of steps for the motors (actually the total time for a move and the time between steps for each motor) which it sends to the Arduino.
I wrote a simple Arduino program to control them. I added 3 stepper motors (X, Y and Z axes) to a small lathe (Sieg C1). I reckon it would help if you explain the sort of tasks you want your CNC to do. I had a problem with the SVG files from a newer version of LibreOffice. I do my 2D drawing with LibreOffice 4.3 Draw which I think is better than InkScape and which can export SVG files that Inkscape can use. I know nothing about SolidWorks and I have never put in the time to learn proper 2D Cad, never mind 3D. but i have not found a way to generate GRBL code from there. I have an old version of SolidWorks that was given to me due to it being outdated.
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