When handwheel 1 is rotated about fixed axis A, motion is transmitted to slide 2 through pinion 3 and rack 4. This traverses shaft 11 with workpiece 5. At this, roller a, mounted on cross-slide 6, contacts cam 7 and moves crosswise with respect to slide 2, turning quadrant 8, connected to cross-slide 6 by a flexible steel band, and shaft 11. Thus, a helical motion is imparted to workpiece 5. This enables the helical surface on the workpiece to be precisely ground by grinding wheel 9. Spring 10 holds roller a in contact with cam 7.
$2975$CxG,FD$