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The MK1
A simple machining project

This engine is designed to be a simple machining project for the aspiring model engineer. It is designed to not use castings or brazing and used bar-stock for all the parts. The piston, con-rod and big end bearing are machined in one piece for simple assembly and only a 3-jaw chuck is required on the lathe.

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1 - Base Plate
2 - Main Axle
3 - Bearing
4 - Crank
5 - Crank Pin
6 - Frame
7 - Cylinder
8 - End Cap
9 - Piston
10 - Pivot
11 - Pivot Nut
12 - Flywheel

Also : Bolts 6x 10 BA or similar
2x M4 countersunk screws
1x M4 grub screw

The menu below details the manufacture of each component in the order they were made. 

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Base Plate
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Main Axle
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Main Bearing
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Crank and Pin
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Frame
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Cylinder
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Cylinder Cap
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Piston & Rod
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Cylinder Pivot
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Pivot Nut
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Flywheel
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Assembly & Test

Plans

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A PDF file of the engine plans

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Plans for a suitable simple boiler

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Plans for a model boat

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Since publishing these plans, lots of people have sent in pictures of their engines based on this design. Click to view the gallery.

All images shown with owner's permission.

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