Thanks for the info John, I tried marking 1/16 down on the top note strings,speaking length of 50mm,which is 3.1mm,looks right, but 1/8 of the note 1 speaking length(1256mm) is 157mm which is almost in line with the top of dampers at that end. Judging as close as I can the striking point at the base end should be 133mm below the v bar which with a horizontal line to the other end comes very close to the 1/16 of the speaking length at the top note(3.1mm) do you think the idea of duplicating the ratio at several points from another piano is valid? thanks again,Tony ----- Original Message ----- From: "John Delacour" <JD at pianomaker.co.uk> To: "Pianotech List" <pianotech at ptg.org> Sent: Thursday, August 02, 2007 10:05 AM Subject: Re: striking point for new hammers > At 6:19 pm +1000 1/8/07, anthony wrote: > >> l'm about to fit a new set of hammers to an old wilcox and white >> angelus upright piano which has had the old hammers removed and also new >> tuning pins and strings installed. >> >>my question is related to the striking point,is there a rule of thumb that >>is accurate enough for this? >>can you use a ratio of the speaking lenght at several positions and draw a >>line betwen them? > > Go down 1/8 of the speaking length on note 1 and 1/16 of the speaking > length on the top note and you'll probably find the line joining them (the > strike line) is horizontal. If not, get a piece of card, rest it on the > action beam at the top note and mark it 3mm below the top bridge. > Transfer this mark to the bottom string and join the two points. Note > that some pianos raise the hammers above the line a little towards the > tenor break to make room for longer dampers. > > JD >
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