At 01:45 PM 10/18/98, you wrote: >In <3.0.5.32.19981018113734.007ad340@capecod.net>, on 10/18/98 > at 11:37 AM, Jon Page <jpage@capecod.net> said: >># UW DW SW FW KR BW F SR >>16 34 68 11.9 32.8 0.53 51 17.0 6.33 >>16 25 58 10.7 32.8 0.53 41.5 16.5 6.15 > >I admit to not having paid as close attention as I should have, but could >you refresh my memory as to what all of these abbreviations are? Some I >know, but some I am unfamiliar with. >----------------------------------------------------------- >Charles Farinella<c_farinella@conknet.com> >----------------------------------------------------------- Up Weight Down Weight Strike Weight Front Weight Key Ratio Balance Weight Friction Strike Ratio SW weight of hammer and shank as weighed with the center pin resting on a pivot off the scale platen FW weight of the front of the key with the balance rail hole resting on a pivot off the scale platen KR ratio of capstan to balance rail : b/r to key front BW (UW+DW)/2 F (DW-UW)/2 SR amount of force needed at the front of the key to move 1 gr. SW As understood by me after reading Dave Stanwood's articles. Case in point: If you try to achieve a 50 DW with a Friction of 20 gr, your UW is 10 gr. (too low) But if you can relieve the friction to 15 gr prior to weighing off the key; then your UW is 20 which is spec for S&S concert grands in the bass. The key is to attend to friction before any changes are made. A rough regulation will also help you to preceive the options and make a judgement. I offered the figures on note #16 because it had the same friction before and after lightening the hammer. When I remove the s/f/h from the rail for lightening, I repin before I reinstall them so most other samples exibit a lower Friction due to the repinning. Now two gr off the hammer would show a slightly lower friction. So when one approaches an action, many things have to be taken into account. One is what type of use will it be needed for, performance, practice, home, size of room, playing style of owner; to name a few. Also current Touchweight and desired range. Knowing the relationship of friction, weight and leverage within the regulation scheme is a study which benefits you and your customer. It's like everything, the more of them you do, the easier they are and you know atuomatically what to anticipate for any given execution. Once again, the Renner Parts Kit is a handy tool for chosing the right part. Unfortunately no one around here wants to buy new parts, just make the old ones work, I can do that. All thunk out now,
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