How do hydraulics's work?
Answer:
Hydraulics work because of fluid pressure. A hydraulic arm consists of a tube filled with some sort of non-compressible fluid such as oil. One end of the tube is connected to a fluid reserve and pump, and the other end has a rod or other device inserted into it through a seal. When the pump is turned on, fluid is pumped into the tube, causing the rod to extend from the other end of the tube and lifting or moving whatever it is attached to.
Pneumatics work along a similar principle, but use a gas instead of a liquid.
JLynes didn't quite get to the heart of the magic of hydraulics.
When one places a 10 psi pressure into one end of the incompressible fluid, that 10 psi pressure translates throughout the fluid. If one presses on a 1 sq.in. actuator with 10 pounds (10 psi), and then allows the diameter of the fluid to open to 100 sq.in., one now gets a lifting force of 10 psi * 100 sq in == 1000 lbs. The price one pays is that for every 1 inch the load travels, the actuator has to travel 100 inches to maintain the pressure.
In princliple it works on the
principle of a differential pressure acting on a surface.
But, that's also the reason they don't work.
Since the whole theory of hydraulics
is completely dominated by idiots
in the auto industry.
Who, unfortunately for the idiots
the only thing the idiots know
about surfaces is viscosity, IBM,
and VIN numbers.
they work because fluids are essentially non-compressible so they transmit force via pressure applied to an area (i.e. force = pressure * surface area). this is how hydraulic jacks can lift a very large weight with very little applied force.
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