----- Original Message ----- > On Jul 3, 2007, at 2:05 PM, Farrell wrote: >> I'm working on an 1890s Knabe grand. Everything in the action is >> new except rails and keyframe (both of which have been rebuilt) and >> action brackets. > > From the pix, it's clear that this is one of these 19th century > actions with extremely tall string heights. Yes it is. 8-3/4" string height. > The line from the Rep > center to the cap/heel contact looks almost as steeply inclined than > the line from the hammer center to the knuckle/jack contact. The > further from horizontal is the swing of your levers, the more of the > the arc's motion ends up in the horizontal vector rather than the > vertical. Well, the levers are horizontal, but I do agree with you that the further the contact point is between two levers (such as the wip-heel/capstan contact), the more horizontal motion will be introduced. In this case however, whereas the original configuration with some very tall back-angled capstans has tons of friction on the wip heel contact (you could easily observe the capstan sliding a millimeter or so along the heel), the modified configuration seems to be very efficient - no sliding is evident at all. So my suspicion is that this action can be setup efficiently with the current string heights - unless, of course, if there is some other major issue I am overlooking. > It's a form of action inefficiency aggravated by tall > string heights. The only solution is to raise the keybed (......what > is this guy, nuts or sumpin'?) Man, I'll go to some pretty far extremes for the no compromise approach, but.......... > On Jul 3, 2007, at 4:11 PM, Farrell wrote: >> How can you be so smart to know that this action had lots of lead >> in the keys? ;-) > > On Jul 3, 2007, at 2:05 PM, Farrell wrote: >> FW: 36.25 (0.966 of Stanwood's maximum FWs) > > Speaking of which, you didn't list a SW. (Or was that the "F= 11.5") Indeed, you are correct. SW on that note (#16) was 11.9 (as indicated on the hammer) > Mr. Bill Terry Farrell -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20070704/00fab1f7/attachment.html
This PTG archive page provided courtesy of Moy Piano Service, LLC