according to the instantaneous size and the required size of the workpiece acted upon (B23Q15/06 takes precedence)

Full Title

Automatic control or regulation of feed movement, cutting velocity or position of tool or work > while the tool acts upon the workpiece > Control or regulation of feed movement (B23Q15/12 takes precedence) > according to the instantaneous size and the required size of the workpiece acted upon (B23Q15/06 takes precedence)