FVT 1000MC C axis mode the M code function 

The FVT-1000MC can goes to C-axis mode function, and the live tool turning will instead of chuck's turning (spindle rotation), so live tool itself become a spindle for milling the workpiece.
M80 C-axis mode ON
M82 C-axis mode OFF
M83 C-axis mode (power tool CW)
M84 C-axis mode (power tool CCW)
Becareful the CW and CCW's definition that power tools have vertical and horizontal direction, once the direction is changed that CW and CCW are different, so operator must check the direction first.
M85 C-axis mode power tool rotation stop
M86 C-axis mode the rotation change (CW become CCW) or (CCW become CW)
M87 : Cancel M86 function