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Chapter 6 Memorizing Pitch Error Compensation
519
Ⅲ
Connection
the position No.001 in the offset table from the machine zero. So the pitch error offset can only be
done in the positive moving direction of the machine coordinate system.
The position No.000 in the offset table corresponds to the reference point (i.e. pitch error origin 0),
the offset point 1 corresponds to a point of positive 10.000 moving from this reference point, and So
there is a offset point every 10.000 mm. l. At offset point N, set an offset value which is the
compensation amount by moving from (N-1) × (offset interval) to N×(offset interval).
The following table content is resulted from the above:
Actually the machine moves from the reference point to the point of +30.000, the pitch error offset
is: (+7) + (-6) + (+4) =+5
Data
②
parameter No.098 (pitch error origin) =60, No.099 (offset interval) =10.000
When the pitch error origin is set to 60:
For the positive moving, the 1
st
segment error offset is set by position No.061 in the offset table,
the 2
nd
segment by position No.062. The Nth segment error offset is set by position No.060+N in the
offset table.
For the negative moving, the 1
st
segment error offset is set by position No.060 in the offset table,
the 2
nd
segment by position No.059. The Nth segment error offset is set by position No.060-N in the
offset table.
The machine zero is taken as the reference point of the pitch error origin, when moving from the
positive of machine coordinate system, it begins to compensate by the corresponding position
No.061 in the offset table; when moving from the negative of the machine coordinate system, it
begins to compensate by the position No.060. Therefore the pitch offset can be done when moving in
the positive or the negative axis of machine coordinate system.
Setting
point
Machine
coordinate
system
（Reference point）
0
+10.000
-20.000
-60.000
58
59
60
61
(-7)
(-7)
(+6)
(+4)
(+0)
-10.000
The position No.060 in the offset table corresponds to the reference point, No.061value in the
Machine coordinate
system
Offset
parameter No.
Offset
value
Drive unit current code
pulses before compensating
Drive unit current command
pulses after compensating
Reference point 0
000
000
00000
00000
10.000 001
7 10000
10007
20.000 002
-6 20000
20001
30.000 003
4 30000
30005
…… 004
…
