上海维宏电子科技股份有限公司
Weihong Electronic Technology Co., Ltd.
Specialized, Concentrated, Focused - 59 -
3.11 Compensation
3.11.1 Screw Error Compensation
Related parameters are:
Decides whether to execute screw
error compensation, including
unilateral compensation and two-way
compensation.
0: No compensation;
1: Single compensation;
2: Double compensation
Backlash Compensation
valid
It sets whether to enable backlash
compensation.
It sets the value of backlash of each
axis, only valid when parameter
―Backlash Compensation Valid‖ is set
―Yes‖.
If parameter ―Screw Error Comp‖ is set as ―0‖, and parameter ―Backlash Compensation valid‖ as
―Yes‖, only backlash compensation is activated.
If parameter ―Screw Error Comp‖ is set as ―1‖, and ―Backlash Compensation valid‖ as ―Yes‖,
backlash compensation and unilateral error compensation are activated, used when backlash is
relatively constant; if ―Screw Error Comp‖ is ―2‖, forward error compensation and backward error
compensation are executed together, used when backlash is not constant.
Concept and Principle
Screw error consists of screw pitch error and errors caused by backlash.
Pitch Compensation:
Pitch error is caused by defect in manufacturing of screw and long-term wear, etc. In order to
improve precision, pitch compensation is needed. The sketch of screw is shown in Fig. 3-33. 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 ideal moving curve is as curve ―1‖ in Fig. 3-34,
however, 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, actual moving curve deviating from the ideal one, and their
difference is called error, i.e.:
Error = nominal mechanical coordinate – actual mechanical coordinate
Fig. 3-33 Sketch of screw
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