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Copyright 1996, 2000, Denis Cousineau
How to create the necessary pressure in the hoses?
A pump is required. Three alternatives are proposed here:
The small pump
The small pump can only increase the pressure by a very small amount
since its inner chamber is so small. However, since it is generally
connected to a fast motor (see assembly below), it can produce a reasonable
amount of pressure in a small time.
The large pump
The large pump is much more efficient. Its inner chamber is pretty large,
so that in a single pump, the pressure can be increase much more. However,
it is much more difficult to connect it to a Lego motor because of the
presence of a spring. The assembly below shows one way to embed it in a Lego
pumping station. I put two shocks to compensate for the spring on the pump.
All springs are of equal strengths, but the two shocks are located twice
closer to the center of rotation. One new Lego motor is strong enough to
active the pump.
A car pump!
This is maybe the most efficient may to have pressure. In fact, it is too
much pressure, and the hoses will certainly pop out of there sockets with
this characteristic "pop" sound.
If you adopt this last method, you’ll need to regulate the pressure:
When a critical pressure is achieved, stop the pump. However, since there is
no pressure in the hoses, if the pump is stopped, your pneumatics don’t
work anymore. For that reason, you need a pressure tank. See next section to
build a pressure tank and a Lego regulator.