Rockwell Automation 8520 9/Series CNC Lathe User Manual
Page 442
Programming Feedrates
Chapter 18
18-16
Selecting Linear Acc/Dec Values (G48.n - - nonmodal)
Programming a G48.x in your part program allows you to switch Linear
Acc/Dec values in nonmotion blocks. Axis values in G48.n blocks will
always be treated as absolute, even if the control is in incremental mode.
Below is the format for calling G48 commands. Use this format with the
axis names assigned by your system installer:
G48.n X_Y_Z_
Where :
In this mode :
Units of
measure :
Sets up :
Macros :
XYZ
G48
N/A
acceleration, deceleration, and jerk
ramps back to the AMPed values
Important:
All axis words in a G48 are
ignored.
N/A
XYZ
G48.1
in./sec
2
or
mm/sec
2
acceleration ramps for Linear Acc/Dec
mode
#5631 to 5642
G48.2
in./sec
2
or
mm/sec
2
deceleration ramps for Linear Acc/Dec
mode
#5651 to 5662
G48.3
in./sec
2
or
mm/sec
2
acceleration ramps for S--Curve Acc/Dec
mode
#5671 to 5682
G48.4
in./sec
2
or
mm/sec
2
deceleration ramps for S--Curve Acc/Dec
mode
#5691 to 5701
G48.5
in./sec3 or
mm/sec3
jerk limits
#5711 to 5722
Important: The allowable programmed range for the axis word depends
on the configured format. If you exceed these allowable ranges set by your
system installer, you may use paramacros to override this limit.
For example, if the allowable programmed range for the axis word is 3.4
(e.g., 999.9999 max input) and the desired jerk limit is 100,000 mm/sec
3
,
you may set Paramacro #1 to 100,000 and program a G48.5 X#1 to set the
jerk limit to 100,000. This method can be used for any of the G48
programming blocks.
Example 18.1
Allowable Programmed Range
#1 = 100000;
G48.5 X #1;
Important: The part program G48.n adjustments to Acc/Dec Ramps are
not applied to jog moves. The AMPed Linear Acc/Dec mode rates are
used when Manual Acc/Dec mode is linear.