Have you considered Pure Sound wire? dp David M. Porritt dporritt at smu.edu -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Ric Brekne Sent: Friday, December 22, 2006 10:45 AM To: pianotech at ptg.org Cc: caut at ptg.org Subject: Downbearing Guidlines Hi experts out there... Just a quick question I'm hoping for a few hints on. Given a soundboard that deflects from 4mm of crown to 1 mm of crown with 250 lbs of presure spread over its surface roughly evenly.... what kind of downbearing pressure should I be looking at achieving. Said another way.... what kind of string tension should I be looking for. The scale I am working with is a very low tension scale with plain wire breaking %'s around 35 %. with modern wire used as a base for figureing. I'm thinking that an increase to 45 % should be perhaps a minimum. The scale needs to remain quite low tension because of structual concerns.. Thoughts ? Cheers RicB
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