
B--63003EN--1/02
7. FEEDRATE CONTROL/ACCELERATION
AND DECELERATION CONTROL
588
In automatic feedrate control mode, the feedrate for the tool is controlled
as described below.
- The feedrate required at a corner is calculated from the specified
feedrate difference at the corner along each axis, the tool being
decelerated to the calculated feedrate at the corner.
N2N1
Specified
feedrate
N3 t
N1
N2
N3
Y
X
Example:
- The feedrate required in a block is calculated from the specified
acceleration along each axis at the start point and end point of the
corner, the tool being decelerated so that the feedrate in the block
does not exceed the calculated feedrate.
N2 N3 N6 N7N1 N8 t
N1
N2
N3
Y
X
Example:
N7
N6
N4
N5
N8
Specified
feedrate
- The feedrate required in a block is calculated from the angle of
downward movement along the Z--axis, the tool being decelerated
so that the feedrate in the block does not exceed the calculated
feedrate.
N2N1
Specified
feedrate
N3 t
N1
N2
N3
Z
X
Example:
The feedrate required at a corner is calculated from the feedrate difference
along each axis, as described below.
When the tool is to move at the specified feedrate F, a comparison is made
between the feedrate change along each axis (Vc[X], Vc[Y], ...) and the
value (Vmax) set in parameter No. 8410. If Vmax is exceeded by a
feedrate change along any axis, the tool is decelerated at the corner to the
required feedrate Fc:
Fc=F×
1
Rmax
where Rmax is the largest value of R =
Vc
Vmax
Feedrate control
conditions
Examp le of feedrate
determin atio n based on
a feedrate difference
along each axis