Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 525)

Fixed Cycles
Chapter 25
25-5
Function
G76 mill control types.
G86.1 lathe control types.
These parameters determine the axis and direction that the cutting tool
shifts when executing a fine boring cycle. For these parameters to be
effective, it is necessary to program a shift amount using a Q-word (the
parameter Fine Boring Shift in Q-word must be “YES”).
There are 3 parameters available to determine the shift direction and axis
for the fine boring cycle. The parameter that is used to select the direction
and axis used for the shift is determined by the active plane (G17, G18, or
G19) when the fine boring cycle is programmed. For example, if the fine
boring cycle is programmed in the G17 plane, the control uses the axis and
direction for the shift that is selected with parameter number [77] (single
process).
Select the primary axis number in that plane, and the direction to travel on
that primary axis. This determines the axis and direction that a Q-word
shifts the cutting tool.
Parameter Parameter Number
Single Process Process 1 Process 2
Fine Boring shift direction G17 [77] [20077] [21077]
Fine Boring shift direction G18 [78] [20078] [21078]
Fine Boring shift direction G19 [79] [20079] [21079]
Range
Selection Result
(a) (G17, G18, G19) Primary axis 1 positive
(b) (G17, G18, G19) Primary axis 1 negative
(c) (G17, G18, G19) Primary axis 2 positive
(d) (G17, G18, G19) Primary axis 2 negative
Notes
This is a global parameter; the value set here applies to all axes.
This parameter may also be changed on the control by using the
fixed-cycle parameters table.
For Dual Processing controls, this is a per process parameter. The value set
in the parameters applies to all of the axes assigned to that process.
25.4
Fine Boring Shift Direction
G17, G18, and G19