High-Speed Feed Rate Setting - Mitsubishi Electric Q Series Programming Manual

5 PARAMETERS FOR POSITIONING CONTROL

5.2.5 High-speed feed rate setting

The high-speed feed rate is the positioning speed used to perform positioning with G00
or to make a home position return with G28, and this data is needed to execute G00 or
G28.
When executing interpolation control with G00, change the speed of each axis based
on the axis whose time to reach the target position is the longer, and find the
combined-speed.
The high-speed feed rate setting example for interpolation control with G00.
[Example] Interpolation control from the current position (X=0, Y=0) to the target
position (X=200, Y=100)
High-speed feed rate
G00 X200.Y100.;(Interpolation control execution)
Find the combined travel value
200 + 100
2
After the above program execution, the reaching time of each axis is as follows.
X-axis: 200.[mm]/20[mm/min] = 10[min]
Y-axis: 100.[mm]/1[mm/min] = 100[min]
Since the reaching time of the Y-axis is longer, use the Y-axis as the reference axis
for the feed rate and find the combined-speed.
(Reference axis feed rate) (Reference axis travel value)
POINTS
(1) The high-speed feed rate of each axis is clamped at the speed limit value of
parameter block. The clamped value is also used to determine the axis whose
time to reach the target position is the longest.
(2) In the above calculation, the travel value and feed rate used are calculated
without units. Care must be taken when their units differ.
(Example)
• Travel value
10000 for the travel of 1 [mm], 100000 for 1 [inch], 100000 for 1 [degree]
• Feed rate
100 for the feed rate of 1 [mm/min], 1000 for 1 [inch/min], 1000 for 1
[degree/min]
X-axis 20[mm/min]
Y-axis 1[mm/min]
223.6067 [mm]
2
(Combined travel value)
223.6067[mm]
1[mm/min]
5 - 8
Y
100.mm
High-speed
feed rate
1 mm/min
0
(Current position)
High-speed feed rate
20 mm/min
2.23[mm/min]
100[mm]
(Combined speed)
(Target position)
X
200.mm