GSK GSK980TDc, Manual

Page: 47 / 470

Chapter 2 MSTF Command
29
Ⅰ
Progra
mming
analog voltage control
Command function: The spindle speed is defined, and the system outputs 0 ～ 10V analog voltage
to control spindle servo or converter to realize the stepless timing. S
command value is not reserved, and it is 0 after the system is switched on.
When the spindle speed analog voltage control is valid, there are 2 methods to input the spindle
speed: the spindle fixed speed is defined by S command( r/min), and is invariant without changing S
command value, which is called constant speed control(G97 modal); other is the tangent speed of
tool relative to the outer circle of workpiece defined by S command, which is called constant surface
speed control (G96 modal), and the spindle speed is changed along with the absolute coordinates
value of X absolute coordinates in programming path when cutting feed is executed in the constant
surface speed.
Please refer to Section 2.2.3 .
The system can execute 4 gears spindle speed. Count the analog voltage value corresponding
to the specified speed according to setting value(corresponding to No.037
～
No.040) of max. spindle
speed (analog voltage is 10V)of current gear, and then output to spindle servo or converter to ensure
that the spindle actual speed and the requirement are the same.
After the system is switched on, the analog output voltage is 0V. The analog output voltage is
reserved (except that the system is in cutting feed in the surface speed control mode and the
absolute value of X absolute coordinates is changed) after S command is executed. The analog
output voltage is 0V after S0 is executed. The analog output voltage is reserved when the system
resets and emergently stops.
Parameters relative to the analog voltage control of spindle speed:
System parameter No.021: offset value of output voltage with max. spindle speed (the analog
output voltage is 10V);
System parameter No.036: offset value of output voltage with spindle speed 0 (the analog output
voltage is 10V);
System parameter No.037
～
No.040: max. spindle speed (the analog output voltage is 10V) with
spindle 1
～
4 gears(corresponding to M41
～
M44).
2.2.3 Constant surface speed control G96, constant rotational speed control G97
Command format: G96 S__; (S0000
～
S9999, the leading zero can be omitted.)
Command function: The constant surface speed control is valid, the cutting surface speed is
defined (m/min) and the constant rotational speed control is cancelled.
G96 is modal G code. If the current modal is G96, G96 cannot be input.
Command format: G97 S__; (S0000
～
S9999, the leading zero can be omitted.)
Command function: The constant surface speed control is cancelled, the constant rotational
speed control is valid and the spindle speed is defined (r/min). G96 is
modal G code. If the current modal is G97, G97 cannot be input.
Command format: G50 S__; (S0000
～
S9999, the leading zero can be omitted.)
Command function: define max. spindle speed limit (r/min) in the constant surface speed control
and take the current position as the program reference point.
G96, G97 are the modal word in the same group but one of them is valid. G97 is the initial word
and the system defaults G97 is valid when the system is switched on.
When the machine tool is turning it, the workpiece rotates based on the axes of spindle as the
center line, the cutting point of tool cutting workpiece is a circle motion around the axes, and the
instantaneous speed in the circle tangent direction is called
cutting surface (for short surface