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Weirdly I started with the cylinder and the air cooling fins. These were a challenge in their own right as they needed quite deep parting tool cuts and my initial challenge was keeping the tool lined up and running perpendicular, it had a tendency to bend and go off at an angle.
There are a number of key parameters to remember when using parting tools:
Parting tool being used to make first cut
Larger parting tool used to complete the step
Check the angle carefully to ensure you have set this at 3°.
Locking the saddle before machining the taper keeps everything stable.
The cylinder with all of the lathe operations complete.
The fins were finished with a fine wire wool whilst it was still in the lathe. A small amount of cutting oil works very well with wire wool as a final finish on aluminium.
If you have made a similar engine and would like to share your experience we would love to hear from you - ed.