-Shenzhen Guanhong Automation Co.,Ltd.-
SZGH-CNC1000MDb Series
- 68 -
The positioning plane is determined by plane selection code G17,G18 or G19.The positioning
axis is an axis other than the drilling axis.P47 in Speed par 2 is set for this function.
Although canned cycles include tapping and boring cycles as well as drilling cycles, in this
chapter, only the term drilling will be used to refer to operations implemented with canned cycles.
The drilling axis is a basic axis(X,Y, or Z) not used to define the positioning plane, or any
axis parallel to that basic axis.The axis(basic axis or parallel axis) is used as the drilling axis is
determined according to the axis address for the drilling axis specified in the same block as G
codes G73 to G89.If no axis address is specified for the drilling axis, the basic axis is assumed to
be the drilling axis.
G code
Positioning Plane
Drilling axis
G17
Xp-Yp plane
Zp
G18
Zp-Xp plane
Yp
G19
Yp-Zp plane
Xp
Xp: X axis or an axis parallel to the X axis
Yp: Y axis or an axis parallel to the Y axis
ZP: Z axis or an axis parallel to the Z axis
Travel distance along the drilling axis varies for G90 and G91 as follows:
G90(Absolute command)
G91(Incremental Command)
Drilling Mode
: G73, G74 and G81 to G89 are modal G codes and remain in effect until
canceled. When in effect, the current state is the drilling mode. Once drilling data is specified in
the drilling mode, the data is retained until modified or canceled.
Specify all necessary drilling data at the beginning of canned cycles; when canned cycles are
being performed, specify data modifications only.
Return point level G98/G99
: When the tool reaches the bottom of a hole, the tool may be
returned to point R or to the initial level. These operations are specified with G98 and G99. The
following illustrates how he tool moves when G98 or G99 is specified. Generally, G99 is used for
the first drilling operation and G98 is used for the last drilling operation.
