
B–64113EN–1/01
7. FEEDRATE CONTROL/ACCELERATION
AND DECELERATION CONTROL
406
This function automatically controls the feedrate during corner
machining according to the angle of a corner made by machining blocks
or according to the feedrate difference for each axis.
This function is enabled when deceleration of the first of two consecutive
cutting feed blocks is executed.
Feedrate control can be performed according to the angle of a corner made
by machining blocks or according to the feedrate difference for each axis.
The desired method is selected by specifying the corresponding value in
the CSD bit (bit 4 of parameter No. 1602).
If the angle made by blocks A and B is smaller than that specified in parameter
No. 1740 (for the selected plane), and if the feedrates along the first and second
axes on that plane are lower than that specified in parameter No. 1741, the
system executes block B, assuming that no pulses are accumulated.
The figure shows the relationship between feedrate and time when a
corner angle is smaller than the angle specified in the parameter.
At time t, some accumulated pulses remain, as indicated by the shaded
part. The system, however, starts the next block because the feedrate of
the automatic acceleration/deceleration circuit is lower than that specified
in the parameter.
Time
Feedrate specified in
parameter No. 1741
Feedrate
t
Block A
Block B
@ When linear acceleration/deceleration before interpolation for
cutting feed is enabled
If the angle made by blocks A and B is smaller than that specified in
parameter No. 1740 (for the selected plane), and if the feedrates
programmed for blocks A and B are higher than the value set in parameter
No. 1778, the feedrate is reduced to the value specified in the parameter
in block A. In block B, the feedrate is increased to the programmed
feedrate. The rate of acceleration depends on the parameter for linear
acceleration/deceleration before interpolation for cutting feed.
Speed
Block A Block B
Time
Speed set by
parameter
(No. 1778)
Automatic Corner
Deceleration
D Feedrate control
according to corner
angle