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4. Servo Adjustment
4 - 32
<Adjustment methods>
[1] Confirm that the motor end circle accuracy measured with the NC sampling function is
appropriate.
[2] In this state, measure the tool end low-speed and high-speed circle path without tool end
compensation. The difference of the high-speed circle path and low-speed circle path is the
amount that path has swelled due to the spring effect of the machine system. Calculate the
SV065 setting value with the following expression using this amount as the compensation
amount.
SV065 =
Compensation amount [µm] × radius R [mm] ×10
9
(command speed F [mm/min])
2
[3] Set SV027/bit7 to 1, and input the value calculated in step 2 into SV065. Measure the
high-speed circle path. If the shape is still elliptical, adjust by increasing/decreasing the SV065
value in 1/10 units.
[4] Confirm that there is no problem with the low-speed circle path.
Example of low-speed and high-speed roundness measurement for adjusting tool end compensation
When using grid encoder When using DBB measurement Acceleration
Low speed (reference circle) R=25 [mm], F=500 [mm/min] R=100 [mm], F=1000 [mm/min] 0.00028G
High-speed (when adjusting
compensation amount)
R=25 [mm], F=10000 [mm/min] R=100 [mm], F=20000 [mm/min] 0.11G
No. Abbrev. Parameter name Explanation Setting range
SV027 SSF1 Servo function
selection 1 F E D C B A 9 8 7 6 5 4 3 2 1 0
aflt zrn2 afse ovs lmc omr zrn3 vfct upc vcnt
bit Meaning when "0" is set Meaning when "1" is set
7 omr Tool end compensation invalid Tool end compensation valid
SV065 TLC Tool end
compensation spring
constant
Set the spring constant of the tool end compensation.
In the semi-closed loop control, the tool end compensation amount is
calculated with the following equation.
Compensation amount =
Commanded speed F (mm/min)
2
×
SV065
Radius R (mm)
×
10
9
(µm)
When not using, set to "0".
-32768 to
32767
POINT
1. To confirm the machine's spring element, adjust the electrical end
roundness, and then tool end roundness while changing the cutting speed.
Confirm that the error increases with the speed.
2. The electrical end roundness will have an error on the inner side when tool
end compensation is used.
CAUTION
If an excessive value is set in the tool end compensation spring constant
(SV065), the machine could vibrate when stopping, resulting in a dangerous
state.