BUILDING THE SIMPLEX PETROL ENGINE

Part 6 by Phil Procter

Attachment for making studs on the Myford using a Coventry die head.


This is the turning fixture to produce the radiused flanks on the cam blanks.


Here it is in the lathe loaded up with my blanks ready to go.



And here showing the result of the first pass before turning the blanks over.


Before turning, the blanks had a 3/32 keyway broached in them so they can be both located on the fixtures and on the engine camshaft.


I made two from silver steel so they could be heat treated, and a couple of spares in mild steel just to test the machining fixtures.


I then had to make the fixture for milling the two radii on each cam, bearing in mind the inlet and exhaust are both different.

 

Part one here Part two Part three  Part four  Part five  Part six  Part seven

See also engine description.

https://www.sarikhobbies.com/model-engineer-builder/