Rack 1 is mounted on the travelling slide of the machine tool. Rack 2 is imparted the speed at which the slide should travel. When the two racks travel at the same speed, axis A of pinion 3, meshing with both racks, remains stationary. When the slide travels faster than required, the axis of pinion 3 is displaced to the left, turning lever 4 about fixed axis B and shifting member 5 of the flow-control valve to the right. This reduces fluid flow to the power cylinder of the slide, decreasing slide speed. When the slide travels slower than required, the axis of pinion 3 is displaced to the right, member 5 is shifted to the left and the flow of fluid to the power cylinder increases.
$4035$THP,Dr$