A Tandem Compound Mill Engine PART 8

Continued from p.697 M.E.4756 November 15 The distance from the shoulder on the eccentric strap to the clevis pin in the slide valve spindle is about 38cm which is half the overall length of the model. Just for the length alone the valve coupling rods would need some intermediate support but the drive to the slide valve also has to change direction slightly in the vertical plane in order to miss parts of the HP valve gear. The fulcrum brackets and associated rockers and pins provide this support (fig 22). In later types of engines, the eccentric rods and other bits were eliminated by having pairs of mitre gears coupling a rotating shaft to the crankshaft. This layshaft had eccentrics mounted on it close to each of the valves that…

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Model Engineer (Digital) - 1 Issue, Issue 4757

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