Thanks Bill for the description. They actually do this ???? Now that is suprising. You have to figure at least some folks were aware that this was going to have potentially major effects on touchweight...go figure. No we dont see all that much capstan placement variation in Hamburgs. The two C's we have are idendical, and I've checked 3 D's that I'm trying to talk them into doing a PTD on and they are really close. But I have seen some head scratcher key ratios / and overall ratios from time to time. Worst case was that Duysen grand that got me started on all this, perhaps you remember all the help you and John gave me back then. The down side of the <<make it work>> philosophy of piano work... sometimes it gets taken to far. RicB Bill Ballard wrote: > At 1:38 PM +0200 8/28/03, Richard Brekne wrote: > >This thingy about plate height being the determinant for capstan > >placement has been vaguely put up a few times in the past couple > >years and I have yet to get a finger on exactly how that works out. > >Just what, step by step proceedure do factories use to get from > ><<plate height>> (over keybed ?) to capstan placement ? .............. > In NY, the keyboard is indexed to the arms of the case (fixed > regardless of where the block may put the plate in any given piano), > and the top action is indexed to Strike #88. On a piano with fat > stretcher felt, the action moves into the action cavity while the > keyboard stays put. The cap line is indexed downwards from the rep > cushion, which in this case would be moving (with the action) away > from the keyboard balance pins, thus increasing the KR and FWs. > > Some five years ago, NY Steinway announced that they had solved what > was an inconsistency in KRs from piano to piano (a problem which > Hamburg never had), and from what I've seen, they actually have. They > never described it as a problem related to stretcher felt thickness, > but that's where they had to have fixed it. In the procedure by which > the plate settles in, front-to-back, while fitting it to a pinblock > already glued into the rim. > > As near as I can tell, Steinway is the only factory which had this > particular problem. (That is, among those who should know better.) > > Bill Ballard RPT > NH Chapter, P.T.G. > > "No one builds the *perfect* piano, you can only remove the obstacles > to that perfection during the building." > ...........LaRoy Edwards, Yamaha International Corp > +++++++++++++++++++++ > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives -- Richard Brekne RPT, N.P.T.F. UiB, Bergen, Norway mailto:rbrekne@broadpark.no http://home.broadpark.no/~rbrekne/ricmain.html http://www.hf.uib.no/grieg/personer/cv_RB.html
This PTG archive page provided courtesy of Moy Piano Service, LLC