I've read most of the 4th axis posts and haven't seen my problem so I'm hoping somone can help. I'm setting up my forth axis on a camtech router that has been converted to Mach 3 with a CNC4PC, C11G board. Everthing has been working great for a year and a half but now I want to try my forth axis. I'm using Rhino 4 and Rhino Cam 2.0 basic with the 4th axis option. I set up the "A axis" so one revolution equals 360 on the DRO,the problem is when I run the machine at 200 inches a minute feed rate the A axis is rotating at 200 degrees per minute which slows the other axis down as well. Also what is "ROT 360 rollover " and "Ang short Rot on G0"used for? I've checked off "use radius for feedrate" and "A rotations enabled" not sure if that's correct or not. In the rhino cam post there is an editable value under Multiaxis motion, angle value, scale factor, not sure what it's for but I have a request into Mecsoft for the answer. Thanks for your help