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Originally Posted by Crazy
My problem at the moment is that I don't understand how the pneumatic goes through one gear (I'm assuming it's actually through the shaft?), how to keep the gears from moving if they are on the same shaft as the dog shifter (or maybe they are on different shafts...that idea occured to me but seems intiuitvely wrong), and how to keep the gear from moving.
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The TechnoKat-style (e.g. 2002, AndyMark) gearboxes use a rod through centre of the driven shaft to actuate the dog. The Woburn-style one (from 2004) used a movable plate around the outside of the dog, avoiding the need for a mechanism coaxial to the driven shaft. Both types use pistons mounted outside the gearbox to shift.
Take a look at the
whitepaper I wrote about the 2004 Woburn design; pages 80-83 might have some useful diagrams of the shift plate method. Also, AndyMark has several diagrams of their gearbox (which uses the through-the-shaft method) on their
website;
this one is especially relevant.
Edit: Bah! Beaten by the sneaky Mr. Gilbert....