Just a little clarification, work=force X distance. It is the force required to move the mass of the damper lever that causes work to be done. This force would of course be greater on the planet Jupiter. ;-) It seems to me that also entering the equation is the amount of inertial energy of the entire system. If the damper lever is contacted earlier in the keystroke the system is moving slower and has less inertial energy. If it contacts later the velocity is also greater at that point and so is the inertial energy. With the greater inertial energy any force the system encounters like the damper lever becomes less consequential. Consider a 4x4 post in the ground being hit by a car. If the car is only going 5 mph it will probably stop the car with a pretty good jolt. If the car is going 150 mph you won't even feel it. Dean Dean May cell 812.239.3359 PianoRebuilders.com 812.235.5272 Terre Haute IN 47802 -----Original Message----- From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of Conrad Hoffsommer Sent: Thursday, January 19, 2006 7:05 AM To: Pianotech List Subject: Re: Lightening touch by changing damper timing redux The problem, as I see it, is the mixing of "weights" and "actual feels". Weighing off an action on the bench gives a static weight. Actual feel is dynamic. The dynamic allows the concept of "work" into the mix. If I recall correctly, work is mass x distance. If you delay the damper lift, less work is done since the mass is moved a shorter distance. Since less work is done, the feel is lighter. A note statically weighed off to 52gm which has a key with 7 lead weights will require more work to be done than one which has three weights and a wippen assist spring. (greater mass through the same distance) This is exaggerated as the force is increased by increasing the speed and introducing time into the equation turning it into "power". [mass x distance/time.] This may be simplistic, but it's how I conceptualise it. YMMV Conrad Hoffsommer Every great idea has a disadvantage equal to or exceeding the greatness of the idea. -Murphy's Law calendar _______________________________________________ Pianotech list info: https://www.moypiano.com/resources/#archives
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