It is, however, possible to design to a certain action ratio, or maintain one, without playing hilly nilly with the regulation specs (specifically aftertouch). This will generally require a new balancerail made to a new height and location in order to maintain the half stroke for any given set of parts. The amount of keyleading will still be particularly dependent on the action ratio and hammer weight. I'm in the process of conducting experiments that test the results of front lever arm changes in terms of front weight. David Stanwood has also made the suggestion to compare weight ratio to distance ratio. I'm hoping to have some interesting data in the next few years to share. This making a living business is a real drag, especially in this gloom and doom economy; and it keeps interfering with my artistic and scientific experiments. ZOUNDS!!! Jude Reveley, RPT Absolute Piano Restoration, LLC Lowell, Massachusetts (978) 323-4545 > David Love wrote: >> As one who routinely redesigns actions I'm not sure I would agree that >> key >> lead doesn't play a role in inertial feel of the downstroke. While I >> can't >> provide the math I can say that I have on several occasions taken actions >> that were balanced but where the action geometry had left them with >> excessive key leading. With a simple move of the capstan the removal of >> lead, rebalancing the action back to the same balance weight the action >> "feels" considerably different, less "inertial" as it were. > > Yes, which changed the action ratio. > Ron N > >
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