Specialized Concentrated Focused
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50
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Operation
3.10.2 Track
[Motion Trace] screen can give a 3D display on the processing track followed in real time, with which
users can view the tool path more intuitionally so as to ensure the accuracy of processing program. In
3D tracking mode, abundant operation methods are offered by the system for the convenience of users
to view the motion track from different viewing angles and in an appropriate scaling. P and Q keys can
be used to switch the angle of view.
F3~F6 buttons, shown as below, can also be used to execute operations including zooming in/ out,
centering, clearing screen and so on.
Fig. 3-36 Simulation and Trace Manipulation Buttons
3.11 Compensation
3.11.1 Screw Error Compensation
3.11.1.1 Causes of Screw Error and Compensation Method
Screw error consists of screw pitch error and errors caused by backlash. Generally, these two errors
don‟t need compensation, but backlash compensation is needed in high precision required situation, if
higher precision is required, both the two 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. 3-37(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.
(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, the actual moving curve deviating from the ideal one,
and their difference is called error, i.e.:
Error = Nominal Machine Coordinate
– Actual Machine Coordinate
