Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 541)

Fixed Cycles
Chapter 25
25-21
Notes
This is a global parameter; the value set here applies to all axes.
This feature is not available on the 9/230 control and Grinder
configurations.
Important: Be aware that the distance travelled over the time T1 is
slightly less than the distance expected by multiplying the time T1 by the
active cutting feedrate. This is because some distance is lost during
acceleration and deceleration of the axis.
Function
This parameter is used by mill controls when operating in 7300 mode and
calling G83, deep hole drilling cycle. This parameter is not available for
lathe or grinder controls.
The G83 deep hole drilling cycle performs a series of infeed and retract
steps when drilling. In 7300 mode, the length of these retract steps is
determined by the retract time (T2) set by this parameter. Each retract step
takes place at the rapid feedrate. See Figure 25.2.
Important: The retract time (T2) must be less than the forward drill
time (T1).
Axis Parameter
Number
All [89]
Range
0.01000 to 99999.99000 seconds
Notes
This is a global parameter; the value set here applies to all axes.
Important: Be aware that the distance travelled over the time T2 is
slightly less than the distance expected by multiplying the time T2 by the
active cutting feedrate. This is because some distance is lost during
acceleration and deceleration of the axis.
This parameter is not valid on the 9/230 and Grinder controls.
END OF CHAPTER
25.11.4
Retract Time (T2) for G83