
B–63503EN–1/01
7. FEEDRATE CONTROL/ACCELERATION
AND DECELERATION CONTROL
294
N1 N2 N3N1 N2 N3
This function can suppress acceleration in an arc machining block to an
allowable level by clamping the feedrate. Based on the arc radius R and
the maximum allowable feedrate V for that arc radius (which are set in
parameters), this function calculates the maximum allowable feedrate v
for an arc with a programmed radius r, as shown below. If the specified
feedrate exceeds feedrate V, the feedrate can be clamped to feedrate v
automatically.
Maximum allowable acceleration =
V
2
R
R : Arc radius, V : Feedrate for arc radius R
Then, the maximum allowable feedrate v for an arc with radius r is
obtained from the following expression:
v + rńR
Ǹ
V
As the specified arc radius becomes smaller, the maximum allowable
feedrate v falls. To prevent the maximum allowable feedrate from
becoming too small, the lower limit for feedrate clamping based on the
arc radius can be set in parameter 1732. If the maximum allowable
feedrate is less than the value set in parameter 1732, the parameter–set
value can be used as the maximum allowable feedrate v.
Feedrate clamping by
arc radius