Ariel SG 31 frame 32 engine

[Murray.Cann]

Another part that I believe I've had success on was a gear in the Burman gearbox. A sliding gear with 20 and 26 teeth on it had a broken tooth . I searched the rusty metal at my club and came up with a gear the same but without the dogs. As seen here

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after much deliberation with engineeering firms and other members I decided to have a go myself and successfully managed to anneal it, mill it and reharden, with the aid of a heat treatment oven I built recently.

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Of course the proof wont be in until it is running.

[john.whiting]

The later (no dog) BAP gear is oil hardened 3% nickle steel,and not particularly hard.....you should be able to mill it without annealing........certainly if you use a solid carbide cutter.If you harden the new gear right out,it will likely be too brittle in the teeth.Without using a coating,its also very likely to be decarburized during heating,leaving a soft surface..........Not a criticism,just a few details for reference.