1) The document discusses a pneumatic circuit experiment involving a step counter double cylinder circuit. The objectives are for students to accurately construct the pneumatic circuit and briefly report on their experimental results in a group. 2) It describes the functions of limit switches and idle rollers in pneumatic circuits to achieve continuous sequencing. Safety precautions for the experiment are also provided. 3) The procedure involves identifying components, constructing the circuit diagram, developing the actual circuit, checking connections, and testing the circuit.

1. 1.0 Title : Step Counter Double Cylinder Circuit
2.0 Objective
At the end of the lab session students should be able:
i. To construct accurately the pneumatic circuit
ii. To report briefly the pneumatic experiments in group.
3.0 Theory
Limit switch and idle roller is the component of the pneumatic system that using to get
the continuous sequence. Limit switch will be activated in both directions while the idle
roller activate for one direction only. Both components will be apply in basic pneumatic
circuit and idle roller is very important to prevent double signal from appear.
4.0 Safety Precaution
First of all, it is important to mention some safety rules such as :
i. Do not start the experiment without the technician or lecturer.
ii. Do not using damage equipments.
iii. Make sure the pneumatic hose is plug incorrect position and should be deep
enough.
iv. Setting on air supply to medium pressure ( 3 – 10 bars ).
v. Store all the component at their exact place after complete all the experiment.
vi. Do not unplug the pneumatic hose during operation and etc.

2. 5.0 Procedure
Based on the situation:
i. The pneumatic component was identified.
ii. The pneumatic circuits have been constructed.
iii. The actual circuits have been developed on the pneumatic workbench.
iv. All connection has been checked.
v. The circuits have been ruined through.

3. 6.0 Result
Situation : A+ B+ B- A-
i. Sequence movement ( SM )
a1 b1 a0
A+ B+ B- A-
ST b0
ii. Time motion diagram ( TMD )
1 2 3 4 5
a1
a0
b1
b0

4. iii. Pneumatic circuit

5. 7.0 Discussion
Actual circuit.
We compared the experiment circuit with actual circuit. We found that type of DCV not same.
experiment circuit use DCV 5/2 way with spring, but in actual circuit we use DCV 4/2 way with
spring. It can operate in complete circuit because the function of both DCV are same.
8.0 Conclusion and Recommendation
Our conclusion is we can know how to construct accurately and can arrange the
component of pneumatic circuit systematically. Then we can know how to report and
explain briefly the operation of pneumatic experiment in group. Next we can learn to find
out the correct component and equipment. For our recommendation there are
components that have been damaged mixed with the component that can work.
Components should be separated so that students do not use these components to build
the circuit. Components need to be replaced with new components so that students can
use enough components to build the circuit mainly used by many groups.

6. 9.0 Reference
Sources: Websites
http://www.clippard.com/downloads/general/PDF_Documents/Intro_to_Pneumatics.pdf
(4 October 2012 22:07 pm)
http://www.digitalcircuitry.com/DOC/ELECTRONICS/Manuals/Pneumatics/Course%20Books/Tex
t-Pneumatics%20Basic.pdf
(4 October 2012 01:15 pm)