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MMD > Archives > February 2004 > 2004.02.23 > 09Prev  Next

James Watt & Watt's Linkage
By Harald Mueller

Nicholas Simons wrote:

> The Watt's linkage consists of three pin-jointed links that create
> a straight line motion without any recourse to a straight edge.

Just to be nit-picky: It only creates an _almost_ straight line.
However, the small "S swing" can be made as small as one wants.

Harald M. Mueller

 [ I am studying Watt's linkage right now as I am fitting a
 [ replacement pneumatic action stack into a different piano.
 [ I want to minimize the scrubbing motion of the vertical pushrod
 [ where it contacts the tail of the whippen, which means that the
 [ contact surface at the whippen must lie on the line through the
 [ whippen fulcrum (pin joint).  Naturally, the whippen construction
 [ of the old piano action doesn't come close to the ideal geometry.
 [ :-(  -- Robbie

(Message sent Mon 23 Feb 2004, 08:15:58 GMT, from time zone GMT+0100.)

Key Words in Subject:  James, Linkage, Watt, Watt's

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