Besides cnc router combined rotary device(rotary device be regarded as 4th axis of cnc router), we also offer 4 Axis Linkage cnc router.
Both 2 machines can work on cylindrical material, like newel posts, baluster etc. but
WHAT IS THE DIFFERENCE BETWEEN 4TH AXIS AND 4 AXIS LINKAGE CNC ROUTER?
4th axis cnc router controller is DSP A11. This system only could drive rotary device rotate at some speed and can not command it pause at some position. Suitable for cylindrical material with regular pattern. Like newel posts.
4 axis linkage controller is DSP A15. This system could command rotary device pause at any position. Then the cnc machine could engrave the un-regular pattern. Like moddillion. See this video.