How-To: Watt-style mechanical governor

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By Sean Michael Ragan
Posted 2010/09/01 @ 8:42 am
Category Computers & Mobile, Craft, Science

Adam Richard Cooper built this hand-cranked model of a classic mechanical governor–which, as MachinistBlog succinctly put it “regulates the speed of steam engines by acting as a negative feedback system”–and made the dimensional drawings and build notes freely available for download at his site. I like the idea of a hand-cranked governor model, particularly, because it provides tactile feedback of the device’s purpose: You crank it faster, it gets harder to crank.

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3 Responses to How-To: Watt-style mechanical governor

Rick on September 1st, 2010 at 9:43 am said:

Actually, on a steam engine the fact that as the balls swing out it takes more energy isn’t how it governs the speed of the engine.

When the balls fly out the lower flange lifts up. The lifting of the lower flange would control a steam valve via a set of mechanical linkages.

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- kakungulu on September 1st, 2010 at 3:02 pm said:
  
  The steam valve control is how the governor works in steam engines. I saw a governor built for a music box that has a plastic ring limiting the weights to a certain height/speed. I guess when the rotation reaches a specific speed corresponding to the music rhythm, the friction with the ring slows it down.
  In this case, if you dare cranking up the governor to more than the max speed, the weights lift up to your face level and slap you. That’s sort of speed control…
  
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Upgrade on September 2nd, 2010 at 10:40 am said:

And that, ladies and gentleman, is the origin of the expression “balls out”.

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