[pianotech] Coupled Actions - was Action Ratio Measuring

[Joseph Garrett]

Thumpe(r) said:
"Makes one wonder if the key pinned to the wippen, as in early Knabe
uprights and grands, was a better and more thought out idea than many of us
have assumed? (Who've been faced with working on these models.) Because, by
that arrangement, you have an actual crank --- rather than a cam.
 
(From an admitted, pre-American Piano Company era Knabe appreciator. Dig
those laminated ribs!)"
 
Thumpe(r),
The real problem with those actions was not the link, but what they had for
the adjustment....the Rocker Capstan! And, where they chose to link. A few
were way off in their calculations of action balance, etc., imo.
Regards,
Joe


Joe Garrett, R.P.T.
Captain of the Tool Police
Squares R I