This fine model was built by Bob and he reported good performance.

This engine was built by Marc from Belgium.

Malcolm in the U.k. made this fine example using a mix of Aluminium and brass parts. It had a particularly nicely finished base.

Malcolm plans to make the flywheel more authentic by recessing the side faces and adding some lightening holes.

Stewart from the U.K. made this engine as part of his metalwork studies.

Stewart worked very closely to the plans including making his own pivot nut, but enhanced the design with a dished flywheel and recessed band around the cylinder body - nice touch.

This is Kevin's engine from New Orleans.

Steve Vine made a very fine job of machining his little oscillator.

This model was notable for its smart round base and stronger connecting rod.

Like some other builders, Steve used a collar on a plain shaft to retain the pivot spring but also included some cups to hold the ends of the spring. Nice work.

Steve has reported good performance running his engine on compressed air.

Alasdair built this faithful copy of the oscillating engine and reported good running at both low and high speeds, when running on compressed air.

Rowan not only built the oscillating engine but also a boiler to go with it. The whole plant looks terrific and he reported that the engine runs well.

The boiler and fittings were all scratch built by Rowan. The lagging was made from stained coffee stirrers which look very effective and the regulator is a modified science gas tap. The oak base was made by his uncle.

Rowan stated that at full speed the boiler can get exhausted and so he is planning an upgrade to the burner at some point.

Andrew from York in the UK made this nice copy of the engine. This was his first metalworking project but you wouldn't guess from looking at it - it has turned out really well.

Andrew stuck closely to the original plans but added a feature on the knurled nut to locate and hold the pivot spring.

Peter from Sweden sent this picture of his finished engine. It was also his first project in metal working.

Peter used square section steel bar for the main frame and also added a pedestal bearing on the end of the crankshaft for extra support.

I found this image of the simple oscillating engine on the Model Engineer Forum.

I've been unable to contact the builder but I think it was built by someone called David, in the UK.

David has made a very fine job indeed, particularly regarding the fluted frame part and the recessed cylinder body. These features make the engine look less like a toy and more like a model. The Brass flywheel looks very tidy too.

Like many others here, David has also gone for a pivot nut which is locked in place with a grub screw.

Nice job.

The model engineer forum can be found at :

Barry in the UK made this highly polished version of the simple oscillating engine. The design was adapted to suit the materials which were available and it was finished on an oak base. The completed model looks superb.

The engine has successfully run on compressed air and Barry said that it performed nice a steady at slow speeds. He also advised that lapping the cylinder port face to the frame helped with efficient running.

Barry has been in touch again and this time included a picture of an engine built by his apprentice, David.

David has also polished the engine to a fine finish and took the opportunity to practice some knurling on the flywheel.

Jose has sent in this picture of his simple oscillating engine. Nice job.
The pivot pin has been Loctited in to the cylinder a collar used to tension the spring.

Jose has more recently fabricated a spoked flywheel for his engine (inset). Ingeniously, it is made of a bolt head for a hub, nails for spokes and has a wooden rim. Top marks for a clever use of materials.

More details of his build can be found at :

Here is another version of the simple engine made by Jim. This was a learning project for Jim, but he still made a fine job of the machining and he reported that it worked first time.