Hi, I am using TurboCad, LazyCam, and Mach 3 software with a Zenbot CNC router Mill. The training videos said to setup the Z axis at the top of the slide to zero and the bottum to -4 for the software limits. When I load the G code from LazyCam to the Mach 3 software the code contains Z values greater then Zero and the software limits kick in. How do I deal with problem? One more question, What is a good feedrate for the RotoZip wood bit? Thanks in advance for any feedback received.