Smithy CNC Mills - Manual (Page 40)

SmithyCNC Programmer’s Reference Manual:M Codes
SmithyCNC Programmer’s Reference Manual: M-Codes 3-4
it has been turned off by an M9.
The tool change may include axis motion while it is in progress. It is OK (but
not useful) to program a change to the tool already in the spindle. It is OK if
there is no tool in the selected slot; in that case, the spindle will be empty after
the tool change. If slot zero was last selected, there will definitely be no
tool in the spindle after a tool change.
3.4 M7, M8, M9: Coolant Control
To turn mist coolant on, program M7.
To turn flood coolant on, program M8.
To turn all coolant off, program M9.
It is always OK to use any of these commands,
regardless of what coolant is on or off.
3.5 M48, M49: Override Control
To enable the spindle speed and feedrate override switches, program M48. To
disable both switches, program M49. See Section [sub:Feed-Interaction] for
more details. It is OK to enable or disable the switches when they are already
enabled or disabled. These switches can also be toggledindividually using M50
and M51 as described in the sections [sec:M50:-Feed-Override] and [sec:M51:-
Spindle-Speed-Override-Control].
3.6 M50: Feed Override Control
To enable the feedrate override switch, program M50 or M50 P1. To disable the
switch program M50 P0. While disabled the feed override will have no influence,
and the motion will be executed at programmed feedrate.(unless there is an
adaptive feedrate override active).
3.7 M51: Spindle Speed Override Control
Speed-Override-Control>
To enable the spindle speed override switch, program M51 or M51 P1. To dis-
able the switch program M51 P0. While disabled the spindle speed override will
have no influence, and the spindle speed will have the exact
program specified value (using the S-word as described in [sub:S:-Set-Spindle]).