Steve,
Both the Accucraft and Roundhouse valve gears are a single
eccentric gear, using a slotted link for reversing, thier is no lap and no
expansive working possible, notching up only shortens the valve travel and
gives late admission and early closing..
This gear is fine for models
At 08:46 PM 8/31/04 -0700, you wrote:
I consulted a couple of ancient, dusty, and dog-earred tomes, Harry,
both of them had good diagrams but lacked sufficient explanatory text
Steve,
I usually find the best old ones have such complex theories,
explanations, and diagrams as to be
Harry et al.
Stephenson valve gear.
This is not quite correct. the original Stephenson valve gear consisted
of a loose eccentric and a driving collar and driving pin. The
Stephenson valve gear as we are referring to came about in 1842 when
a Draughtsman named Williams Employed by Robert
