Ok I just got a 4 axis desktop CNC engraver. I intend on engraving names and BMP files on cylinders that are approx .750 in diameter. I found a program called F-engrave that is really easy to convert a BMP or DXF to G-Code. It works flawlessly on a flat part. What I have done was to edit the program and replaced all "X" values with "A" in my machine program (Mach 3) I set the "A" axis to linear. (Do I still have you or have I lost anyone yet) I am a novice at CNC but a toolmaker for 35 years. ( I Know enough to be dangerous ;-) ) anyway when I do this about 20 % of the programs work. The other 80% while the machine starts to engrave the machine gets a mind of its own and starts doing a couple circles using the X & Y. Remember that I removed all "X" commands and changed to "A" Why does the x move at all and does anyone have any answers for me. This is very frustrating so if anyone can help I would really appreciate it. Rob