Crankshaft – Poppet Valve Single

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This crankshaft for the poppet valve engine has been machined from mild steel and includes timing gear machined directly on the shaft. 

Three views of the roughed out crankshaft

The webs of the crank are just wide enough to still fit a 3-jaw chuck.

Re-aligning the crank in the lathe allowed me to later machine the bearing surfaces to size.

As the crankshaft and timing gear were in one part I had to make the bearing large enough for the gear to fit through. This meant I needed a ball bearing with a large ID.

About Nigel 231 Articles
Have been making models since I was around 7 years old and using a lathe from the age of 11, a self taught engineer with a passion for making model engines.

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