TheGrandwork Systemfavors trial-and-error and go-nogo procedures over formulas and numbered measurements. In general, numbers and math empower designers and manufacturers but slow down piano technicians. So, why feature numbers in my discussion of grand weighoff?
The mechanics of a grand action are brilliant, a series of levers that reaches inside the piano while converting finger force into a hammer force that can play strings with musical expression. Such a feat has many complicated details, but observed individually, they are logical, pragmatic – mechanical. Geometry is the design engine for this collaboration. And its leverages both transfer these forces and transform the distances they travel. Each finger’s mechanical advantage (2 kilograms to play a 10-or-less gram hammer) is divided by 5 in a tradeoff multiplying finger travel distance by 5 into a hammer travel distance that accomplishes fff. Or ppp.