Again, my big questions are, how do I increase the friction in the upright action and can I do it without adversely affecting performance? If this were attainable, it seems the inertia in the keys would be easily resolved. Yes, the keys need a predominance of weight in the rear, but once an acceptable DW/UW were achieved, key inertia could then be adjusted by adding a front and a rear lead at equal distances from the balance rail, giving the pianist the inertial-resistance that is desired when playing at forte - as opposed to just a static measurement of DW/UW which isnt concerned with inertia. I understand how the springs in the upright action affect the touchweight, but that doesn't affect the friction. What I am really looking for is that silky movement of the key that you find in a grand when the DW is 50 and the UW is 25. I know this is not impossible in an upright; I have measured actions that have performed this way, but I havent studied them. The only time I saw the Fandrich upright was long before I was doing touchweight work. Would that action shed any light on these questions? Thanks, John Original message. Hello all. I need some help with upright touchweight. Ive searched the archives, with little gain. I redesign grand touchweight on a regular basis, incl. leverage, friction and mass. The wonderful results I gain there leads me to want to understand the upright action better, especially for the sake of many gifted students who lack the resources to invest in a grand. For example, a Samick upright, JS 115: Downweights 40-45gr Upweights 30gr Keyleads Bass 1 lead, 2 behind balance rail Mid 1 lead at back of key Treb 2 leads at back of key My biggest question: Is it possible to widen the difference between the DW and UW (friction), or do you just shoot for an acceptable Balance Weight? What do you do about the inertia of the keys? For feel, we should have more inertia in the bass than in the treble. It should be contiguous, therefore the butt springs would have to be adjusted after the keys are leaded. Ive considered double-leading the key (front and rear) to increase inertia in the bass without affecting the static touchweight, but would that affect repetition speed? _________________________________________________________________ Experience the magic of the holidays. Talk to Santa on Messenger. http://clk.atdmt.com/MSN/go/msnnkwme0080000001msn/direct/01/?href=http://imagine-windowslive.com/minisites/santabot/default.aspx?locale=en-us
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