
B--63003EN--1/02
7. FEEDRATE CONTROL/ACCELERATION
AND DECELERATION CONTROL
587
This function reads several tens of blocks ahead to exercise automatic
feedrate control.
A feedrate is determined on the basis of the conditions listed below. If a
specified feedrate exceeds a calculated feedrate, acceleration/deceleration
before interpolation is used so that the calculated feedrate can be
established.
(1) Feedrate change and specified allowable feedrate difference along
each axis at a corner
(2) Anticipated acceleration and specified allowable acceleration along
each axis
(3)Cutting load change anticipated from the direction of motion along the
Z--axis
In automatic feedrate control mode, the feedrate is automatically reduced
with acceleration/deceleration before interpolation to minimize the stress
and strain applied to the machine.
Specified tool path
Tool path when fee-
drate control is not
used
Tool path when fee-
drate control is used
Machining error reduced due to deceleration
based on an allowable acceleration
Machining error reduced
due to deceleration based
on an allowable feedrate
difference
To use this function, set bit 0 (USE) of parameter No. 8451 to 1, and set
the following parameters:
Parameter No. 8410: Allowable feedrate difference used for feedrate de-
termination, based on a corner feedrate difference
Parameter No. 8475, bit 2 (BIP) = 1: Enables deceleration at a corner.
Parameter No. 8470: Parameter specifying an allowable acceleration for
feedrate determination, based on acceleration
Parameter No. 8459, bit 1 (CTY) = 1, bit 0 (CDC) = 0
Parameter No. 8464: Initial feedrate for automatic feedrate control
Parameter No. 8465: Maximum allowable feedrate for automatic fee-
drate control
For details, see the description of each parameter.
7.1.14.2
Automatic feedrate
control function