Programming manual.
CNC 8070
THE SPINDLE. BASIC CONTROL.
7.
Spindle speed
·125·
(REF: 1709)
7.2.2 Constant surface speed
The functions related to spindle speed programming may be used to select either Constant
Surface Speed mode or Constant turning speed mode. Constant Surface Speed is only
available at the master spindle of the channel.
G96 - Constant surface speed.
G97 - Constant turning speed.
At constant surface speed, the CNC changes the spindle speed as the perpendicular axis
moves in order to maintain the cutting speed constant between the tool and the part, thus
optimizing the machining conditions. When working at constant surface speed, it is
recommended to limit by program the maximum turning speed that the spindle can reach.
See "7.2.1 G192. Turning speed limitation" on page 124.
G96. Constant surface speed.
The G96 function only affects the master spindle of the channel.
After executing G96, the CNC interprets that the spindle speeds programmed for the master
spindle of the channel are in meters/minute (feet/minute). This work mode is activated when
programming a new speed while G96 is active.
This function may be programmed anywhere in the program and it doesn't have to go alone
in the block. It is recommended to program the speed in the same block as the G96 function.
The spindle gear (range) must be selected in the same block or in a previous one.
G97. Constant turning speed
The G97 function affects all the spindles of the channel.
After executing G97, the CNC interprets that the spindle speeds programmed are in rpm and
starts working at constant turning speed.
This function may be programmed anywhere in the program and it doesn't have to go alone
in the block. It is recommended to program the speed in the same block as the G97 function;
if not programmed, the CNC assumes as programmed speed the one the spindle is currently
turning at. The gear may be selected at any time.
Properties of the function and Influence of the reset, turning the
CNC off and of the M30 function.
Functions G96 and G97 are modal and incompatible with each other.
The CNC assumes function G97 on power-up or after an emergency. After executing an M02
or M30, and after a reset, the CNC cancels maintains function G96 or G97 that was active
before.
The following functions are oriented to lathe type machines. In order for Constant Surface Speed mode
to be available, the machine manufacturer must have set one of the axis -face axis- (usually axis
perpendicular to the shaft of the part).
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