Type Of Feedrate G96, G961, G962, G97, G971 - Siemens SINUMERIK 828D Function Manual

V1: Feedrates
17.2 Path feedrate F
Revolutional feedrate in JOG mode
In JOG mode, the response of the axis/spindle also depends on the following setting data:
SD41100 $SN_JOG_REV_IS_ACTIVE (revolutional feed rate for JOG active)
If this setting data is active, an axis/spindle is always moved with revolutional feedrate:
MD32050 $MA_JOG_REV_VELO (revolutional feedrate with JOG)
or
MD32040 $MA_JOG_REV_VELO_RAPID (revolutional feedrate with JOG with rapid traverse overlay)
depending on the master spindle.
If the setting data is inactive:
• the response of the axis / spindle depends on the setting data:
SD43300 $SA_ASSIGN_FEED_PER_REV_SOURCE (revolutional feedrate for position axes/spindles)
• the response of a geometry axis on which a frame acts is to rotate, depending on the channel-specific setting
data:
SD42600 $SC_JOG_FEED_PER_REV_SOURCE
DB31, ... DBX62.2 (revolutional feedrate active)
A programmed, active revolutional feedrate (G95) is displayed using the following NC/PLC interface signal.
DB31, ... DBX62.2 (revolutional feedrate active)
17.2.3

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.
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.
Determining the spindle speed
Based on the programmed cutting rate (either S
axis (radius), the control system calculates the spindle speed at the TCP using the following formula:
1370
or S ) and the actual cartesian position of the transverse
G96 G961
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions