Detailed description
2.1 Path feedrate F
Basic logic functions: Feeds (V1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
15
Constant speed (G97, G971)
G97, G971
deactivates the "Constant cutting rate function" (
G96
,
G961
) and saves the last
calculated spindle speed. With
G97
, the feedrate is interpreted as a revolutional feedrate (as
with
G95
).
When programming
G971
, linear feedrate is selected (as with
G94
). The feedrate
F
is
interpreted in mm/min or inch/min.
When
G97
,
G971
is active, an S value can be reprogrammed to define a new spindle speed.
This will not modify the cutting rate programmed in
G96
,
G961
.
G97, G971
can be used to avoid speed variations in movements along the transverse axis
without machining (e.g., cutting tool).
Note
G96
,
G961
is only active during workpiece machining (
G1
,
G2
,
G3
, spline interpolation, etc.,
where feedrate
F
is active).
The response of the spindle speed for active
G96
,
G961
and
G0
blocks can be defined in the
channelspecific machine data:
MD20750 ALLOW_G0_IN_G96 (
G0
logic for
G96, G961
)
When constant cutting rate
G96
,
G961
is selected, no gear stage change can take place.
The spindle speed override switch acts on the spindle speed calculated.
A DRF offset in the transverse axis does not affect the spindle speed setpoint calculation.
At the start of machining (after
G0
) and after NC Stop,
G60
,
G09
, ... the path start waits for
"nAct= nSet".
The interface signals "nAct = nSet" and "Set speed limited" are not modified by internal
speed settings.
When the speed falls below the minimum speed or if the signal "Axis/spindle stationary" is
recognized, "nAct =nSet" is reset.
A path operation, which has started (
G64
, rounding), is not interrupted.
Summary of Contents for SINUMERIK 840D sl
Page 282: ...Index Basic logic functions Acceleration B2 64 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 388: ...Basic logic functions Travel to fixed stop F1 Function Manual 11 2006 6FC5397 0BP10 2BA0 52 ...
Page 962: ...Index Basic logic functions Emergency Stop N2 20 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 1704: ...Constraints Basic logic functions Spindles S1 94 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 1716: ...Index Basic logic functions Spindles S1 106 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 1996: ...Index Basic logic functions Tool Offset W1 208 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 2150: ...Table of contents Basic logic functions Appendix 4 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 2184: ...Glossary Basic logic functions Appendix 38 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...