Detailed description
2.1 Path feedrate F
Basic logic functions: Feeds (V1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
13
• If the setting data is not active, the response of a geometry axis on which a frame with
rotation acts depends on the channel-specific setting data:
SD42600 $SC_JOG_FEED_PER_REV_SOURCE
(in JOG mode revolutional feedrate for geometry axes, on which the frame with rotation
acts).
"Revolutional feedrate active" DB31, ... DBX62.2
A programmed, active revolutional feedrate (G95) is displayed using this interface signal.
Alarms
• If no F value is programmed, alarm 10860 "No feedrate programmed" is issued.
The alarm is not generated with G0 blocks.
• If a negative path velocity is programmed, alarm 14800 "Programmed path velocity
smaller than or equal to zero" is output.
• If a revolutional feedrate (G95) is programmed but no master spindle has been defined,
alarm 10810 "No master spindle defined" is output.
2.1.3 Type of feedrate G96, G961, G962, G97, G971
Constant cutting rate (G96, G961)
The constant cutting rate is used on turning machines to keep the cutting conditions
constant, independently of the work diameter of the workpiece. This allows the tool to be
operated in the optimum cutting performance range and therefore increases its service life.
Selection of G96, G961:
When programming G96, G961, the corresponding S value is interpreted as the cutting rate
in m/min or ft/min along the transverse axis. If the workpiece diameter decreases during
machining, the speed is increased until the constant cutting speed is reached.
When G96, G961 is first selected in the part program, a constant cutting rate must be
entered in mm/min or ft/min. When the command is reselected, a constant cutting rate may
be entered.
With G96, the control system will automatically switch to revolutional feedrate
(as with G95), i.e. the programmed feedrate F is interpreted in mm/rev or inch/rev.
When programming G961, linear feedrate is selected automatically (as with G94). A
programmed feedrate F is interpreted in mm/min or inch/min.
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