06-12-2012, 06:01 PM
Air Engine
Air engine 2.docx (Size: 344.28 KB / Downloads: 34)
ABSTRACT
Engine is making the crankshaft. The main crank for the engine is actually directly off the flywheel, but a secondary crank is needed to actuate the sliding valve assembly. This secondary crank only has a 6 mm throw to it, so I could make it by gluing another piece of dowel to the main shaft. The second piece of dowel is carved to a crescent shaped cross section to allow it to fit neatly against the shaft. After that, I cut away part of the main shaft.
By pressing my guide firmly against the carved away section, and turning back and forth, I could always see the glossy sections where my guide had rubbed against the shaft, and used that as a guide for where to remove material.
Once I was satisfied that the middle part of my crankshaft was sufficiently round, I made two reinforcing plates to glue on either side of it. I made these by drilling two 5/8" holes with centers 6 mm apart. After drilling the holes, I cut out a small rectangle around the holes, and glued it on to the crank. Gluing the pieces on was a simple matter of sliding it on from the ends of the crank.