I just finished machined aluminum Cushman cylinder head for Groff Machine.
Made from Mic6 cast tooling plate for it's dimensional stability and low inherent stresses, it also has a relocated spark plug position, 14mmx1.25 plug threads, increased cooling fin area and a revised combustion chamber shape to accommodate larger valves and cylinder bore.
I used a long .125"dia. ball-end mill with a lot of patience to get the fins cut, run time on the fin side was at least 6hrs. Despite the blocky appearance, there is a whole lot of free-form machining but it turned out well, cant wait to see it at home on an engine now. Just for kicks, I made an RP 1:3rd scale model for posterity using and Objet Eden 260v.
More Projects Coming!
