In agree with Terry. 1890's Knabes are amazing pieces of craftmanship. And the upright actions have curious geometries which, I believe, lend them a much closer approximation to a grand touch than other uprights. Does yours have the wooden action frames & rocker capstans ? Thump --- Michael Gamble <michael@gambles.fsnet.co.uk> wrote: > Hello Terry and List > There's an awful lot needs discussion - about > uprights. One item your posting brought out was the > issue of UW. This, I suppose, is Uplift Weight? On > page 165 of Max Matthias book "Steinway Service > Manual" he gives the factory key weighting as 47g. > and the Uplift weight 20gr. with the dampers raised. > There are several other important facts discussed in > the book, about grands and upright S&S, but is it > possible to show, graphically, how this Uplift > Weight is calculated and derived? > Regards from a freezing, sunny Sussex-on-Sea > Michael G.(UK) > ----- Original Message ----- > From: Terry > To: Pianotech > Sent: Friday, February 25, 2005 1:02 AM > Subject: Re: upright balance weight > > > I don't know what might be a good BW for an > upright. I have lots of questions about balancing an > upright action. Rumors have it that David Stanwood > is looking into upright action balancing. In your > case you have a lot of UW, if you don't have too > much lead in the keys now, you could add a little > lead to the front of the key to get the DW down to > 50g or so and still have over 30g UW. How does the > capstan/wippen-heel-cushion interface line up - > would moving the capstan help or hinder? Also, what > is the status of you butt springs - the tension > there will affect things also. > > Do you have a picture of your Knabe? 1890s Knabes > are just awesome! > > Terry Farrell > > What would be optimal balance weight for an > upright? > > My searching has revealed a suggested lower > 40's. I have a 56 gDW, 37gUW. friction is ~10 > grams. 46gBW. > > I'm thinking I need a 4 gram drop in BW. Sure I > know it's just an upright but I want performance. > I'm thinking capstan move. > > Kpiano __________________________________ Do you Yahoo!? Yahoo! Mail - Helps protect you from nasty viruses. http://promotions.yahoo.com/new_mail
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