Here is an example of a new balance rail that is parallel at rest but set-up with a new key proportion at a half stroke intersect. One could also taper the balance rail if the strike line is not parallel with the belly and make a different profile for the sharps altogether (as seen on the new Mason CC). There are many improvements to be made, but I'm finding the real challenge to be finding the customers that are willing to pay for it. In the meantime, I'm having fun... Jude Reveley, RPT Absolute Piano Restoration, LLC www.absolute-piano.com ----- Original Message ----- From: "John Delacour" <JD at Pianomaker.co.uk> To: <pianotech at ptg.org> Sent: Wednesday, January 20, 2010 11:55 AM Subject: [pianotech] Balance rail profile [was Action Ratios Re...] > The design of the rail also needs to take into account the angle of the > key when at rest. Some pianos (eg. the Steinway grand) have the key > horizontal when it is fully bedded; in other words the front of the key is > elevated 10mm from the balance point when at rest. -------------- next part -------------- A non-text attachment was scrubbed... Name: Key Proportion in CAD.jpg Type: image/jpeg Size: 60187 bytes Desc: not available URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100120/bf4fe526/attachment-0001.jpg>
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