Siemens SINUMERIK 840D sl, Function Manual

Page: 1620 / 2184

Detailed Description
2.1 Spindle modes
Basic logic functions: Spindles (S1)
10
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Preconditions
• The spindle need not be synchronized.
• No spindle position actual-value sensor required for
M3/M4/M5
in connection with:
– Inverse-time feedrate coding (
G93
)
– Feedrate in mm/min or inch/min (
G94
)
– Tapping with compensating chuck (
G63
)
• A spindle position actual-value sensor is an essential requirement for
M3
/
M4
/
M5
in
connection with:
–
Revolutional feedrate (
G95
)
– Constant cutting rate (
G96
,
G961
,
G97
,
G971
)
– Thread cutting (
G33
,
G34
,
G35
)
– Tapping (
G331
,
G332
)
– Activate position control (
SPCON
,
M70
)
Position control ON/OFF
The spindle can be operated with or without position control:
SPCON
(Position control ON)
SPCOF
(Position control OFF)
Speed control mode
Speed control mode is particularly suitable if a constant spindle speed is required, but the
position of the spindle is not important (e.g., constant milling speed for even appearance of
the workpiece surface).
•
Speed control mode is activated in the part program with
M3
,
M4
,
M5
or with
SPCOF
.
•
NC/PLC IS:
DB31, ... DBX84.7 (open-loop control mode)
is set.
•
NC/PLC IS:
DB31, ... DBX61.5 (Position controller active)
is reset if position control is not used.
•
Acceleration in speed control mode is defined independent of the gear step in machine
data:
MD35200 $MA_GEAR_STEP_SPEEDCTRL_ACCEL
and should, whenever possible, correspond to the physical properties.