Programming instructions

NC Programming 17VRS Motion Blocks
4-47
DOK-MTC200-NC**PRO*V17-ANW1-EN-P
Upper Spindle Speed Limit 'G92'
The G92 function can be used to set an upper spindle speed limit when
G96 is active. When G96 is active, the surface speed is kept constant.
This can lead to a spindle speed which theoretically is of infinite magni-
tude in the case of face turning or cutting down to the center of rotation.
For reasons relating to machining technology, it may be necessary to limit
the maximum spindle speed to a value which is less than the maximum
spindle speed set in the parameters. G92 is used to set a maximum up-
per limit for the spindle speed when G96 is active.
G92 S <Upper Spindle Speed Limit>
G92 is active only for the NC-block in which it is located. The limit set for the
spindle speed remains modally active until it is overwritten with a new speed
limit by new programming of G92 or is reset by programming G92 S0.
•
A speed limit programmed using G92 remains modally active until it is
canceled by programming G92 S0 or is automatically reset at the end
of the program RET or by BST, M02, M30.
•
The spindle speed limit set using G92 is deactivated by programming
G97; it is reactivated the next time G96 is programmed.
•
No further functions may be programmed in an NC-block containing
G92.
Spindle Speed in RPM 'G97'
The programmed S-value is interpreted in rpm when the function G97
spindle speed in rpm is used. G97 is the power-on state on the CNC if set
in process parameter Bxx.041; it remains modally active until it is over-
written by a G96.
•
Depending on the settings in the process parameter Bxx.004, G97
may be the power-on default. G97 spindle speed in rpm remains mo-
dally active until it is canceled by G96.
•
After the controller is turned on, after an NC-program is loaded, after a
BST, M02, M30, RET or control reset, G97 is set automatically de-
pending on the setting in the process parameter Bxx.041, and the
spindle speed values (S values) are reset.
•
If G96 is canceled by G97 is active, the most recently active spindle
speed is taken over as the new spindle speed command value.
•
The programming of G 97 spindle speed in rpm is active for all spin-
dles present in the process. The selection of the reference spindle us-
ing SPF must therefore be reset after G 97 has been programmed.
4.6 Rotary Axis Programming
Effective Radii 'RX', 'RY', 'RZ'
With all interpolation moves using G00 and G01, the components of the
local vector are assumed to be constant during an NC-block. The transla-
tional and rotational moves are performed at constant speed. The speed,
inflection-point speed, and acceleration components of all axes involved
in the move are calculated using the same method as before, however
the rotary main axes are taken into account. The effective distances for
the actual distances to the respective main axes are indicated by the
designations RX, RY, and RZ. The CNC only takes the fact components
caused by the rotations of the rotary main axes into account when the
corresponding effective distances RX, RY and RZ are specified with re-
spect to the respective linear main axis about which the rotation occurs.
Syntax