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4. Servo Adjustment
4 - 31
4-3-7 Improvement of the interpolation control path
(1) Tool end compensation
The tool end compensation function compensates the shape of the tool end during high-speed and
high-speed acceleration/deceleration. The spring effect from the tool (spindle) end to the motor
(scale) end is compensated. If the machine has a large spring effect, the shape may be fine during
low-speed operation. However, at high speeds (specially when using a small radius), the section
from the tool (shaft) end to the outer sides of the motor (scale) end could swell, and cause the
shape to become elliptical during measurement of the roundness. The tool end compensation
function compensates the motor end position according to the acceleration size, so the tool end
position is always controlled to the commanded position.
POINT
1. Always evaluate the roundness accuracy at the tool end.
2. Adjust the parameter after adjusting the roundness accuracy at the motor
end.
Without tool end compensation With tool end compensation
During high acceleration,
the end section swells
outward due to the spring
effect.
The inner side is driven by the amount
that the end section swells due to the
spring effect.
Tool end roundness
(machining surface)
Elliptical shape fault
Tool end roundness
(machining surface)
Elliptical shape is
improved
Low speed:
Example:
R25mm
F1000mm/min
High speed
(high acceleration):
Example:
R25mm
F10000mm/min
Both low speed and
high speed are on
the same path.
Command path
(ideal path)
Tool end path
(machining surface)
Tool end path
(machining surface)
Command path
(ideal path)