Exercise 1: Bending Device Problem:- Sheet metals are to be formed using a single acting cylinder. The start signal is to be given by a push button Method:- a. Direct actuation b. Indirect actuation Exercise 2: Separating Product from a Magazine Problem:- • The piston is to extend when a pushbutton is pressed and return immediately to its start position when the pushbutton is released. b. The piston is to extend when a pushbutton is pressed and return automatically to its start position after reading the full extension. Exercise 3: Cleaning Bath Problem: A container of washer is to be dipped in and out of the cleaning bath. The START and Stop for this continuous movement is to be achieved by actuating a pushbutton each. On actuating the stop pushbutton, the container should also stop at the top. By switching off the main valve, the container should not fall into the bath with an impact. Exercise 4: Transfer Magazine Problem A cylinder is used to transfer parts from a magazine. If either a pushbutton or a foot pedal is operated, the cylinder has to extend. Once the cylinder is fully extended, it is to retract to the initial position. A 3/2 way roller lever valve is to detect the full extension of the cylinder. Exercise 5: Transfer Station Problem A transfer station removes a product from a conveyor belt. If the product is detected as present and if the operator presses the pushbutton, the pick up cylinder extends. A 3/2- way roller level valve senses the product. Upon the release of the pushbutton, the cylinder is to retract to the initial position. Exercise 6: Distribution of Billiard Balls The balls from the gravity magazine are to be distributed alternately in receiver 1 and 2. The signal for the advance stroke is to be provided either from push button or from a foot pedal valve. The return stroke is only to be effected after the piston has reached its forward end. The forward and return strokes are to be only effected if there are balls in the magazine. Exercise 7: Control of a casting Ladle Problem Liquid metal is drawn from a smelting crucible by a casting ladle and cast in moulds. The continuous raising and lowering of the ladle .are controlled by the "start" and "stop" pushbuttons. The raising and lowering speed are separately adjustable, EXERCISE 8 The problem. The operation of two identical pushbutton valves advances a forming tool on an edge-folding device. For rapid forward travel; the circuit utilises a quick exhaust valve. The forward movement folds the edge of a flat sheet. If either of the two pushbuttons are released the double acting cylinder is to return slowly to the initial position. EXERCISE 9 The problem With the help of a double acting cylinder slide rules are to be embossed. The signal for the advance movement of the cylinder is only possible when the slide rule is in position and either a pushbutton or a foot pedal valve is actuated. The return movement of the cylinder is to be automatic only when the maximum pre-set pressure (adjustable) has built up in the cylinder when in the forward end position. EXERCISE 10 The Problem The advance stroke signal is input via a manual pushbutton. After reaching the forward end position, the piston must press the work-pieces together for 20 seconds and then return to its initial position.