Hi all,

I’m very new to the world of CNC. I’ve just built a CNC kit which I bought from ebay. It appears to be working (moving via the 'Grbl Controller' software) though, I have a key question. Hope this is not to daft and too funny, for you advanced users.
Here goes, I’m having trouble understanding the Z-axis and how this is initially set up when starting a new job. My worry is that the spindle will go straight through the circuit board I’m about to mill, breaking the drill the bit and damaging the board itself, and I guess not doing the CNC any good!? So, how to I prep the machine to deal with these possible situations?

Many thanks.