User's Manual

Pneumatic / Hydraulic Jack Set SE-8764A
Open the valve to lower the load. Then close the valve again.
Note the position of the large piston that supports the books. Pump the small piston for 5 strokes.
Count the strokes, and use a ruler to measure the distance the piston moved. Also note the volume of
fluid that entered the syringe. Divide the distance by the number of strokes to find the distance out for
one stroke
Repeat the above measurements for some or all of the other small syringes, as directed by your
instructor.
In this table
Force
In
and Distance
In
are the force and distance involved in operating the small syringe. Force
Out
is the
weight of the stack of books, and Distance
Out
is the distance they were lifted as a result of one stroke of
the small piston. Explanations for calculating work, AMA (actual mechanical advantage), IMA (ideal
mechanical advantage), and efficiency may be found in your textbook or in another reference.
Syringe
Force
In
Distance
In
Force
Out
Distance
Out
AMA IMA
Work
In
Work
Out
Efficiency
6cc
Challenge Questions and Calculations
1. What are some examples of hydraulic systems being used in industry or everyday life?
2. Find the AMA, the IMA, Work
In
, Work
Out
, and the Efficiency for each system tried to complete the
table.
3. Which is larger, the AMA, or the IMA? Why is this true? Under what sort of ideal conditions
would the AMA and the IMA be the same amount?
4. Consider the cylinder diameter, cylinder cross sectional area, volume of fluid transferred, and
forces and distances. Which of these is the same for the small and large syringe?
5. The ratio of two distances can be used to calculate the IMA. What other ratio of items in Question
4 gives the IMA?
6. Is the efficiency different for different systems? If so, is there a trend?
7. There are two ways to calculate efficiency from the preceding values in the table. What are they?
© 2001 James M. Housley, Transparent Devices
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