Stationary Engine Kits
Anthony Mount Models
Crosskill's Oscillating Engine
The design for this engine was taken from a book published in the 1870s. One page contained a number of small thumbnail sketches of engines including Crosskill’s oscillating engine. Though no scale or size was given, it was presumed that it would have been a small engine of about six horse power. This type of engine would have been used to power a small workshop or individual machine. The model though based on Crosskill’s design is not an exact copy in miniature. It has been modified to make it easier to build in this small size. The prototype had both a slide valve and governor, these have been omitted. The governor would have required a microscope to build it. Perhaps you could make that the next project.
The idea for this engine is one that while looking attractive, has only a small number of parts, and will not take long to build. It is aimed at newcomers to the hobby and those wanting a change from a more demanding project.
Four castings are required, flywheel, 3” (75mm) diameter, base, table and cylinder. The other parts are machined from rod and bar material. The castings are made using the lost wax process, which should give well detailed castings.
The design requires quite a number of interesting machining operations, covering most of the standard machining methods met with in model engineering. As such, it is a good introduction to the hobby. Being small, it is within the range of many of the small lathes available today. A drilling machine and mill will of course make life easier, but they are not essential. All the machining could be performed on a lathe equipped with a vertical slide.
There are nine drawings in the set plus a parts list, and all are to A4 size. They are dimensioned in both imperial and metric. The imperial dimension appears first with the metric size below. Drill sizes are given only in metric as these are now the preferred size. You will notice that the dimension conversions are not exact, the desire being to use standard material sections from both systems. There are twenty main parts to the design.
The engine can be run on both compressed air and steam. A small compressor of the air brush type will be adequate, only about 10 psi is required. The ‘Pipet’ boiler of the vertical type which is gas fired and available from Cheddar models, and Bruce Engineering, is externally of the type that would have powered many of the full size engines.
As well as castings and drawings, included in the package is a descriptive booklet giving details on how to construct the model.