A Model Twin-Cylinder Marine Engine


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  • Pub No.: 5916
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CONTENTS--Description of the engine and various parts—Lathe and machine work necessary in finishing the engine—Making a built-up crankshaft for the engine.

The beautifully executed model pictured and described in this chapter was built by the famous London model engineering firm of Whitney in City Road. The model is of brass throughout. Possibly for flash boiler steam, and that is admittedly the best for the purpose, it might be well to specify cast iron for the cylinders and pistons. It is said that brass or gunmetal will pit and otherwise cause trouble with very highly superheated steam. Accordingly, it is the prerogative of the builder to decide which material to use. He has but to weigh the ease of construction of brass with the superior operating qualities of cast iron. While this model is not recommended as a project for the dabbler or the rank amateur in mechanics, its construction is delightfully simple for the worker who is possessed of a lathe and who knows how to use it. A screw cutting lathe is not essential as all of the work can be done with a small speed lathe fitted with a slide rest. Of course, the heavier the lathe, within limits, the easier the job and the better the workmanship. However, the advanced model maker who is capable of using his head to overcome difficulties need not hesitate to undertake the construction on even a small bench lathe. The illustrations cover every detail of the engine, the working drawing being supplemented with photographs of the part of the machine ready for assembly. It is assumed that the worker who attempts the construction will be sufficiently familiar with lathe practice to be able to work directly from the drawings without detailed instruction.

8 pages


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