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Live Steam 
Single Cylinder "Mill" Model Steam Engine 
Fully Machined Kit in Brass, Bronze and Steel 


The horizontal single cylinder mill engine is a simple design, yet retains the basic mechanics of engines which powered many mills, factories and mine pits in the nineteenth century.

NOTE: Pictures are of the finished, assembled and painted model, this listing is for the kit of parts - as per per final picture and Assembly Drawing (see Documentation tab above). The optional second flywheel includes a slightly longer crankshaft.

The classic mill engine layout has a double acting cylinder, eccentric driven piston valve and the large brass flywheel offers smooth running and is capable of powering a range of accessories, in a variety of roles. The engine also includes twin split bronze pedestal bearings for the crank shaft and a substantial cast base.

The kit consists of precision produced parts each carefully made and checked to ensure reliability in service.

The cylinder assembly, slider and piston is manufactured from brass and the piston shaft, conn rod and valve from stainless steel so are not susceptible to corrosion. The piston shaft passes through an adjustable gland and the steam inlet can be on the top or bottom of the chest.

Detail Specification:
- Type: Horizontal Slide
- Bore: 14mm
- Stroke: 18mm
- Flywheel Diameter: 70mm
- Valve type: Piston
- Height: 68mm
- Length: 150mm
- Width: 60mm
- Weight: 1.2kg
- Connections: 1/4" x 40 tpi ME

The kit consists of a set of fully machined parts that can easily be assembled using simple tools such as a hex/allen keys, pliers and metal file. The parts are largely unpainted metal parts and will also require polishing/filing to achieve the finish shown in the pictures.

NOTE: The kit is supplied with hex or socket head set screws (as per the pictures). Some screws as provided may need to the cut or filed to length to complete the model, contact us if this will cause a problem.

When assembled the engines are fully working and can be can be run using steam or simply using compressed air from hand or foot pumps.

To power the engine with live steam, connect it to one of our Model Steam Boilers.

See Mill Single Assembly Drawing and Assembly Instructions.

NOTE: The model steam engines and boilers are NOT children’s toys and should not be assembled or operated by children unless under close supervision of an adult.

Name Size Action
Mill Single Cylinder Model Steam Engine Assembly Instructions 1.08MB Download
Mill Single Model Steam Engine Assembly Drawing 875.69KB Download

Horizontal Mill Single Cylinder Engine Kit

  • Product Code:HSA
  • Availability:Out Of Stock

  • £167.00

Available Options


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Tags: Live Steam, Model Steam Engine, Fully Machined Kit, Mill Engine