LECTURE 40 – MULTI ACTUATOR CIRCUITS

SELF EVALUATION QUESTIONS AND ANSWERS

1. Square shaped work has to be drilled using a drilling machine which is pneumatically

operated. Work pieces are fed from a gravity magazine to a drilling machine. These work

pieces are pushed and clamped by means of clamping cylinder 1.0 (A). hole is drilled by the

drilling cylinder 2.0 (B). and work piece is ejected by ejecting cylinder 3.0 (C). The

displacement step diagram is shown in Figure1 . The sequence of operation has to be carried

out either for one cycle or for continuous cycle with start and stop controls. Develop a

pneumatic circuit to implement the given control task.

B+ B-

A-

1

0

0 A

B

1

Step 0 Step 3 Step 4 Step2 Step1

Position step

C+ C- C

Step 5 Step 6 Step7 Step 8

A+

2 Two clips are to be riveted together on a semi automatic press. Components and rivets

are positioned by hand and then removed by hand on completion of the components

operation. The automated part of the working cycle consists of the holding and clamping of

the components (cylinder A) and also the riveting (cylinder B), and the cycle be performed

ending at the starting position after operating a start button.

Design circuit using cascade method.

0.1I

5

4 A+

1.1

A- 2

1

3

4

5

4 B+

2.1

B- 2

3

c1 c0 a0 b1

a0

3 1 3 1 3 1 3 1 3 1

a1

c0

c1

III

I

0.2I III

4

4 3.1 2 C+

5

C-

3

1.0 2.0 3.0

12

a1 3 1

Stop for continuous cycle Start for continuous cycle

Start Single cycle

b0

b1

b0

Q2 Solution

1

4

B(2.0) A(1.0)

Start

5

4 A+

1.1

A-

2

1

3 5

4 B+

2.1

B- 2

3

a0 a1 b0

0

b1

G

2

Pneumatic circuit for A+ B+ B- A-

2 2 2

a1 & b1 Connected to

group ̅ a0 & b0 Connected to group

2

b0

II

2

I

a1

(line1)

b1 a0

a0

(line2)

a1

b1 (line 3) b0 (line 4)

B+ B-

A- A+

1

0

0 A

B

1

Step 1 Step 4 Step 5=1 Step 3 Step 2

Position step

a1 b1 b0

a0