When I was in the midst of designing the gear driven governor, I got talking to a guy who had built steam engines on a commercial basis and he explained that flyball governors do not work on this scale, as the laws of physics don’t scale, which is of course perfectly true. I’m also getting better – the grub screw is underneath the lever, out of sight, by design, not accident! Apologies for the image not being spin sharp, but I think it’s good enough to see the design. Solid meant that I could create a shoulder to make space for a 7BA grub screw, rather than rely on Loctite. I used the same profile for the lever as the plan but machining from
Instead of fabricating the part as per Stuart plan, I machined the lever from a solid piece of 1/4 inch square bar. I didn’t make it wholly to plan (of course). The last component went on the machine today – the lever, known as part 9 on the governor kit plan, it’s the little lever that picks up the vertical motion from the flyball governor and converts it to rotary motion to drive the steam shut off valve.
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