High Volume Pneumatic Compressor
Here are the Instructions to build a LEGO Technic, High Volume Pneumatic Compressor. The Compressor uses 2x Large Pneumatic Pumps to fill the Air tank. A large Pneumatic Cylinder is used to drive a Pole Reversing Switch which turns the Compressor off when the system is fully pressurised.
A large Power Functions XL-Motor is used to drive a 2x 16-tooth gears via a a third 16-tooth ear). The 16 Tooth gears each drive a CAM made from 1×2 thin type Liftarm. The other end of the 1×2 thin type Liftarm, shown RED in the CAD Drawings below, is connect to a shaft which traverses the top of a Pneumatic Pump.
The Power Functions XL-Motor could be replaced by a RC Race Buggy Motor (Part #5292), which runs faster. Also the old style Pole Reversing Switchcould be replaced with a newer Power Functions Control Switch.
High Volume LEGO Pneumatic Compressor Video
A couple of extra LEGO Pneumatic Air-tanks (Part #67c01) are advisable if you intend to use more than a couple of Pneumatic Cylinders. Using 16-tooth Gears speeds up the compressor, but you need fresh fully charged batteries for optimum results.
High Volume Pneumatic Compressor CAD Images (less Pneumatic components)