Friday 13 October 2023

Castings Galore

A few days ago the foundry phoned to tell me my castings were ready. This is what I collected:

There is now a lot of fettling and machining to turn these into usable parts. The material is AB2 Ni-Al Bronze and in my experience this can be quite a tough material to machine - I have used it in the past to make various small parts, however it does have the strength that I need for various critical components such as girder fork links.

For reference, the patterns for the various different parts are detailed here.

Incidentally, the 3 rockers at the bottom of the picture are not for any of my bikes but are destined for a 1930s bronze-head Ariel that had suffered a broken rocker. Apparently this is a common problem with this particular engine as a result of poor design of the rocker geometry,



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