
B–63523EN–1/03
7. FEEDRATE CONTROL/ACCELERATION
AND DECELERATION CONTROL
832
This function can be used when bit 4 (ZAG) of parameter No. 8451 is set
to 1.
Fig. 7.1.14.2 (a) When the tool is moving up along the Z–axis
Fig. 7.1.14.2 (b) When the tool is moving down along the Z–axis
θ
Cutting the workpiece with the end of the cutter (Fig. 7.1.14.2 (b)) incurs
a greater resistance than when cutting the workpiece with the side of the
cutter (Fig. 7.1.14.2 (a)). Therefore, for (Fig. 7.1.14.2 (b)), the tool must
be decelerated. To calculate the required degree of feedrate deceleration,
the automatic feedrate control function uses the angle of downward
movement of the tool along the Z–axis.
When the tool is moving down along the Z–axis, the angle (
q) of
downward movement formed by the XY plane and cutter path is as shown
in the Fig. 7.1.14.2 (b). The angle of downward movement is divided into
four areas, with an override value for each area specified in a parameter,
as follows:
Area 2: Parameter No. 8456
Area 3: Parameter No. 8457
Area 4: Parameter No. 8458
No override parameter is provided for area 1; the override value for area
1 is always 100%. A feedrate determined with a separate feedrate control
function is multiplied by the override value specified for the area to which
the angle q of downward movement belongs.
Area 1: 0 _v q <30_
Area 2: 30 _ v q <45_
Area 3: 45 _ v q <60_
Area 4: 60 _ v q v90_
Example of feedrate
determination based on
cutting load