Programming manual.
CNC 8070
5.
ORIGIN SELECTION
Programming with respect to machine zero
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(REF: 1709)
5.1 Programming with respect to machine zero
Machine zero is the origin of the machine reference system. Movements referred to machine
zero are programmed using the instructions #MCS and #MCS ON/OFF.
Program a movement referred to machine zero.
This instruction may be added to any block containing a movement so it is executed in the
machine reference system.
Machine coordinate system.
The #MCS ON and #MCS OFF instructions activate and deactivate the machine reference
system; therefore, the movements programmed between them are executed in the machine
reference system. Both instructions must be programmed alone in the block.
Considerations for movements referred to machine zero.
Zero offsets and coordinate transformations
When executing a movement referred to machine zero, the CNC ignores the active offsets
(except the PLC offset), the kinematics and cartesian transformations; therefore, the
movement is carried out in the machine reference system. Once the movement has ended,
the CNC restores the offsets, kinematics and cartesian transformations that were active.
The programmed movements do not admit polar coordinates, nor other kinds of
transformations such as mirror image, coordinate (pattern) rotation or scaling factor. While
the #MCS function is active, functions for setting a new origin such as G92, G54-G59, G158,
G30, etc. are not admitted either.
Tool radius and length compensation
Tool radius and length compensation is also canceled during the movements referred to
machine zero. The CNC assumes that the coordinates have been programmed with respect
to the tool base, not to the tool tip.
G00 X30 Y30
G92 X0 Y0 (Coordinate preset)
G01 X20 Y20
#MCS X30 Y30 (Movement referred to machine zero. Offsets canceled)
G01 X40 Y40 (Offsets restored)
G01 X60 Y60
M30
G92 X0 Y0 (Coordinate preset)
G01 X50 Y50
#MCS ON (Beginning of programming referred to machine zero)
G01 ...
G02 ...
G00 ...
#MCS OFF (End of programming referred to machine zero. Offsets restored)
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