V1: Feedrates
17.2 Path feedrate F
Basic Functions
1374
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Master spindle switchover with G96, G961
If the master spindle is switched over when
G96
,
G961
are active, the speed of the former master spindle is
retained. This corresponds to a transition from
G96
to
G97
. The master spindle newly defined with
SETMS
executes the "Constant cutting rate" function generated in this way.
Interrupts
Constant cutting rate G96, G961, G962
• If no
F
value is programmed, alarm 10860 "No feedrate programmed" is output. The alarm is not generated
with
G0
blocks.
• Alarm 14800 "Programmed path velocity smaller than or equal to zero" is output while programming a
negative path velocity.
• If, with an active
G96
,
G961
or
G962
, no transverse axis is defined in the machine data:
MD20100 $MC_DIAMETER_AX_DEF (geometry axis with transverse axis function)
, alarm 10870 "No transverse axis defined" is issued.
• If a negative maximum spindle speed is programmed with the
LIMS
program command when
G96
,
G961
are
active, alarm 14820 "Negative maximum spindle speed programmed for
G96
,
G961
" is output.
• If no constant cutting rate is programmed when
G96
,
G961
is selected for the first time, alarm 10900 "No
S
value programmed for constant cutting rate" is output.
17.2.4
Feedrate with G33, G34, G35 (thread cutting)
17.2.4.1
General
Application of G33
The function
G33
can be used to machine threads with constant lead of the following type:
References:
/PA/ Programming Guide, Fundamentals
/PAZ/ Programming Guide, Cycles
Speed S, feedrate F, thread lead
A revolutional feedrate [mm/revolution] is used for
G33
threads. The revolutional feedrate is defined by
programming the thread lead increase [mm/revolution].
The speed of the axes for the thread length is calculated from the programmed spindle speed
S
and the thread
lead.
Feedrate
F
[mm/min] = speed
S
[rev/min] * thread lead [mm/rev]