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Chapter 6 Memorizing Pitch Error Compensation
521
Ⅲ
Connection
Actually the machine moves from the point -40.000 to the reference point, the pitch error offset is:
(+3) + (-7) + (0) + (+2) = (-2).
6.5.1 Rotation Axis Pitch Error Compensation
Addition axis is the linear or rotation axis (Type B), the pitch error compensation method is
identical with the common linear axis. The pitch error compensation function in which the addition
axis is regarded as the rotation axis (Type A); refer to the following explanations:
z
Movement value per revoltion: 360°
z
Pitch error position interval: 45°
z
The compensation position number of reference point: 60
After the above-mentioned parameters are set, the farthest position number along the negative
direction of the roation axis equals to the compensation position number of the reference point;
The farthest compensation number along with the positive direction is as follows:
Compensation position number of reference point + (Movement value per
revolution/Compensation position interval) = 60 + 360/45 = 68;
The corresponding relationships between the machine coordinate and compensation position
number are shown below:
Machine
coordinate
system
Offset
parameter
number
Offset value
Drive unit current
code pulses before
compensating
Drive unit current
code pulses after
compensating
Reference point 0
0
0
-10.000 127 2
10000
10002
-20.000 126 0
20000
20002
-30.000 125 -7
30000
29995
-40.000 124
3 40000 39998
