# Inversion of spindle rotation direction for spindle M-functions M3/M4 (P-AXIS-00490)

P-AXIS-00490 | Inversion of spindle rotation direction for spindle M-functions M3/M4
Description | The parameter inverts the spindle rotation sense for the M-functions M03 and M04. The inversion is also active for spindle positioning M19 with explicitly programmed rotation direction. If the parameter is set to 1, the rotation direction of M03 and M04 is changed (M03 counter clockwise, M04 clockwise). For example this may be helpful if the spindle is also used as C-axis, and if the spindle orientation is not equal to the C-axis orientation.
Parameter | kenngr.inverse_rotation_direction
Data type | BOOLEAN
Data range | 0/1
Axis types | S
Dimension |  | S: ----
Default value | 0
Drive types | ----
Remarks |