Specialized Concentrated Focused
Fig. 6-11.
Imported!
Restart?
OK
ESC
6.6.6.
Fig. 6-11 Prompt dialog of successful parameter import
Import Error Data
Import the compensation file in the USB flash drive to the system. The system will compensate
automatically according to the imported file in machining.
Screw error consists of screw pitch error and errors caused by backlash. Generally, there is no
need to compensate above two errors. However, in high precision required situation, compensation for
backlash is necessary, and for higher precision requirement, both error compensations are needed.
Pitch Compensation
Pitch error is caused by screw defect and long-term wear, etc. In order to improve precision, pitch
compensation is needed to meet the requirement. The sketch of a screw is shown in Fig. 6-12 (A). A
coordinate system is established, based on “0” point on the screw as the reference point, nominal
value as X-coordinate, and actual value as Y-coordinate. Then the ideal moving curve is as curve “1” in
Fig. 6-12 (B), however, the actual curve will be curve “2” due to pitch error. That is to say, the Actual
value is not the same as its corresponding Nominal value or the actual moving curve is deviating from
the ideal one. We call their difference error, i.e.:
Error = Nominal machine coordinate – Actual machine coordinate
Reference Point
L (Actual value)
2
Actual move (with
pitch error)
05
1 Ideal move (without pitch error)
S (Nominal value)
A Sketch of screw
B Moving curve diagram
Fig. 6-12 Analysis of pitch error
In pitch compensation, generally pitch error value is irrelevant to feed direction. That is, when the
pitch is too small in positive feed, additional pulse is needed, and thus, when negative feed passes the
same position, the same amount of feed pulse should be added. But if the pitch is too large, deduction
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