Attached are a couple of blurry photos of the modification. It may answer the question of the other post on how to buffer the capstan from the damper lever. Regulating the damper lift can happen one of two ways. You first set the timing for the key lift and then shim between the tray felt and the underlever tray with small bits and strips of paper to get the pedal lift uniform. Since the shimming of the felt of one underlever tends to lift the tray felt slightly of the adjacent damper until it settles again from repeated impact, the regulation can be just slightly unstable. Also, the thickness of the tray felt is such that it will compact over time (much more than the relatively thinner action cloth glued to the bottom of the underlever) changing the regulation over time not only overall but because the dampers are heavier in the bass than in the treble, the damper levers in the bass will tend to settle more causing an earlier lift with the pedal. In terms of speed and accuracy, a really refined damper timing using this method requires a lot of different thicknesses and lengths of paper, ironing tools, but most of all, time. The other method, taught by Steinway no less, is to set the key lift and them smooth out the pedal timing by slightly loosening the set screw and raising or lowering the damper lever. The problem is that changes the key lift timing. I suppose you could then go back and modify the key end felt thickness but it seems like a lot more trouble than the capstan system presents. Also, this method won't do if there are changes in elevation between the tray and the damper lever from bass end to treble end, or deal with warping which sometimes can occur in the tray itself. Bottom line is that of course you can accomplish a regulation without the capstan system but the capstan system sure makes it a lot easier, more accurate and more stable. The procedure for installation is simple and making small adjustments later as the damper felt itself settles and compacts is quick and easy. David - Still in speculative mode, what would be the evidence / reasons for that greater stability? David Skolnik Hastings on Hudson, NY At 08:37 PM 12/24/2008, you wrote: >Agreed. Two issues really, the adjustment of damper timing from the >key doesn't involve the tray, of course, and should be consistent. >Adjusting, then, for the pedal lift just becomes so much easier, more >precise and more stable using the capstan system rather than shimming >tray felt. The capstans are installed in the tray with no spoons >required. > >David Love >www.davidlovepianos.com -------------- next part -------------- A non-text attachment was scrubbed... Name: PA250017.jpg Type: image/jpeg Size: 98869 bytes Desc: not available URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20081225/36e237f7/attachment-0002.jpg> -------------- next part -------------- A non-text attachment was scrubbed... Name: PA250024.jpg Type: image/jpeg Size: 82246 bytes Desc: not available URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20081225/36e237f7/attachment-0003.jpg>
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