Manual absolute on and off Manual intervention for selecting whether to add the amount of movement
caused by manual operation to the coordinates (current position in a work-
piece coordinate system) handled by the CNC.
Manual feed in specified direction Feeding a controlled axis manually in any specified direction.
Manual handle feed Feeding a specified controlled axis by rotating the handle to generate com-
Manual handle interruption Manual handle feed performed during automatic operation, in such a way that
the manual–feed amount is added to the automatic–feed amount.
Manual intervention Pausing automatic operation and starting manual operation.
Manual numeric command Feeding a controlled axis in jog mode by executing the data specified in pro-
Manual operation Feeding a controlled axis manually.
Manual per revolution feed Jog feed in which the feedrate is obtained by multiplying the feedrate per rota-
tion, set in the CNC, by the spindle speed. Used to override the jog feedrate.
Manual pressing Manual control in which the operator presses a button on the machine opera-
tor’s panel to start punching.
Manual pulse generator Unit that converts rotation to pulse train when its handle is rotated manually.
Used for manual handle speed.
Manual rapid traverse Feeding a controlled axis at the rapid traverse rate in jog mode.
Manual reference position return Manual feeding a specified controlled axis to a reference position.
Master axis Axis for which move commands can be specified during synchronous opera-
Maximum Stroke Maximum range of movement that can be controlled by the CNC or PMC.
MDI mode Mode in which MDI operation is possible.
MDI operation Automatic operation based on a program input to the CNC from the MDI key-
board. The program is erased upon the completion of MDI operation.
Memory mode Mode in which memory operation can be performed.
Memory operation Automatic operation based on a program previously stored into CNC memory.
Menu switch Use of the CRT/MDI, LCD/MDI or PDP/MDI panel to emulate some switches
on the machine operator’s panel.
Mirror images Inverting an incremental value for a programmed dimension word along a
specified coordinate axis from positive to negative, or vice versa, with respect
to a specified reference point.
Miscellaneous function Auxiliary function Specifying start or stop of the spindle, or the end of a program. Spindle and
tool functions may sometimes be included, in which case the term auxiliary
function is used.
Modal call Calling a custom macro program (once an instruction to call it is specified)
each time a block having an axis movement command is executed. The call-
ing is repeated until the call instruction is canceled.
Modal G code G code which, once issued, remains valid until another G code in the same
group is issued.
Mode Holding a specified function in the CNC. For example, once a cutter com-
pensation preparatory function is issued, the CNC stays in the state in which
cutter compensation is possible until a cutter compensation cancel prepara-
tory function is issued (cutter compensation mode).
Mode selection Selecting an operation mode.