Abstract
It is sometimes desirable to be able to machine a part which is not axisymmetric on a lathe. This process, non-circular turning, requires the synchronization of the tool actuators with the revolution of the spindle. Since the desired shape is known, feedforward may be used to improve the performance of the actuator. A minimal set up for non-circular turning requires three measurements: Spindle angle, tool x-position, and tool z-position. By careful design of the feedforward algorithm, only one tool actuator needs to be under closed loop control; the spindle and the other tool axis can both be left running open loop. Incorporating a model of the desired output response into the feed forward loop provides better robustness than filtering the input signal with an inverse of the actuator dynamics. Since the desired end product is based on spatial measurements, another approach is to transform time-based control to spatially-based control. These approaches are developed and compared, and the experimental work in progress is described.
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