Build this Model Walking-Beam engine


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  • Pub No.: 5481
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by Rudy Kouhoupt

Actual working model requires no castings, features semi-rotary, glandless valve.

As a prime mover, the steam engine came into existence over two centuries ago. From its humble beginnings, James Watt improved upon the operation of the steam engine until he raised it to the position of a great industrial and economic force. One of his innovations, the parallel link motion, functions in this captivating miniature just as Watt specified in his patent of 1784. Briefly, this is how it works: Steam, regulated by the valve, drives the piston up and down in the cylinder in a vertical, straight line. The piston rod, likewise, travels in a straight line but is connected to one end of the beam. This is where the parallel link motion comes in. It is interposed between the piston rod and the beam. There it converts the linear motion of the piston rod into the radial motion necessary for the beam to oscillate, or walk, about its midpoint. At the opposite end of the beam, the connecting rod drops to the crank to impart a rotary motion to the crankshaft. An eccentric mounted on the crankshaft controls the valve so that steam is admitted to and exhausted from the cylinder in the proper sequence of events. The cylinder is double action

11 pages, 1 plate(s)


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