
B–63380EN/02
4. DESCRIPTION OF PARAMETERS
49
1627
FL rate of exponential acceleration /deceleration in the thread cutting cycle for
each axis
[Data type] Word axis
Valid data range
ncremen
sys
em
n
o
a
a
IS-B IS-C
Millimeter machine 1 mm/min 6 to 15000 6 to 12000
Inch machine 0.1 inch/min 6 to 6000 6 to 4800
Set the lower limit (FL rate) of exponential acceleration/deceleration in the
thread cutting cycle (G76, G78 (G92 in G code system A)) for each axis.
Minimum deceleration ratio (MDR) of the inner circular cutting rate in automatic
corner override
1710
[Data type] Byte
[Unit of data] %
[Valid data range]
1 to 100
This parameter sets the minimum deceleration ratio (MDR) when the
inner circular cutting speed is changed by automatic corner override.
In circular cutting with an inward offset, the actual feedrate for a specified
feedrate (F) is expressed as follows:
Rc: Radius of the path of the cutter’s center.
Rp: Programmed radius
F
Rc
Rp
Then, the actual feedrate is controlled so that the feedrate on the
programmed path can achieve the specified feedrate F.
Rp
Rc
Path of the
cutter’s center
Programmed path
Fig. 4.8 (a) Rp and Rc
If Rc is too small in comparison with Rp, such that Rc/Rp 8 0, the cutter
will stop. To prevent this, a minimum deceleration ratio (MDR) is set.
[Unit of data]
[Valid data range]