Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 526)

Fixed Cycles
Chapter 25
25-6
Function
This parameter sets the clearance amount for the G83 peck drilling cycle,
G88 pocket/post/hemisphere cycles, and G89 irregular pocket cycles.
G83 Drilling cycle (mill and lathe control types)
Use this parameter to set the clearance amount “d” for this cycle. This
clearance amount is a buffer that prevents the tool from hitting the bottom
of the previous infeed when the tool plunges at rapid feedrate. The control
feeds the drilling tool at the rapid feedrate to this clearance amount “d” that
is above the depth of the previous infeed.
G88.x Pockets,Posts, and Hemispheres (mill control types)
This parameter sets the clearance amount for any cycle called with a
G88.x. This value represents the amount the tool is raised form the
pre-cycle position during the move of the tool to the center of the specified
pocket/post. This value also represents the amount the tool is raised when
returning to the center point between each level in the pocket/post cutting
operation.
G89.x Irregular Pockets (mill control types)
Important: The Irregular Pocket Milling Cycles feature (G89.1 and
G89.2) is only available prior to release 12.xx. Any attempt to program a
G89.1 or G89.2 in release 12.xx or later will result in the error message,
“Illegal G--code”.
This parameter sets the clearance amount “e” for irregular pocket cycles
called with a G89.x. This value represents the amount the tool is raised
when returning to the center point between each level of the pocket cutting
operation.
Axis Parameter
Number
All [76]
Range
0.00000 to 99999.00000 mm
or
0.00000 to 3936.96850 inch
Notes
This is a global parameter; the value set here applies to all axes
and processes.
This parameter may also be changed on the control by using the
fixed-cycle parameters table.
25.5
Cycle Clearance Amount