Introduction
During normal operation without feedforward control, contour errors occur as the result of the following error on curved paths, in a combination of contours with axes of differing dynamics.
The following error and thus also the contour error can be minimized using a feedforward control. In the case of spindles, a feedforward control is necessary above all when tapping threads with an endlessly rotating spindle because, as far as possible, both the contour axes and the spindle must follow the specified setpoints without a following error if a good machining result is to be achieved.
The feedforward control of the control system compensates the following error based on the current velocity and the acceleration. By appropriate parameterization in the axis parameter lists [AXIS] and also n the NC program, the feedforward control can be adapted to the dynamics of the machine or to the required contour accuracy.
Notice | |
The axes may overshoot when feedforward control is activated. |
Applicability
Feedforward control is available for all axis and drive types [AXIS].