Hi David, I'm not quite clear on what you are saying about short hammer bore hammers "must start with the shanks rotated upwards" Are you talking about the fact that the relative position of a short- bore hammer shank, being higher (more horizontal) than a longer bore would could result in a different touchweight? Thanks, Scott Nelson David Love <davidlovepianos at comcast.net> wrote: I think you've already received adequate postings on this subject but I did want to comment that you do see hammers on some pianos bored short and compensated for with a rake outward so that the hammer is at 90 degrees to the string on contact even if the shank is not parallel (pretty common on older Bechsteins). Boring hammers on the long side so that the shank doesn't reach parallel (except for small amounts in anticipation of wear) is less common unless there is a problem with hammer/belly rail clearance in the treble and strike point issues forcing the hammer to be raked in. Still 1/4" would be excessive. Aside for getting things square at the string, boring them long also can create touchweight problems as it will set the shank at a lower angle when at rest and can increase the effort required to move the key at break away. Interestingly, short bored hammers that must start with the shanks rotated upward will produce the opposite effect. David Love davidlovepianos at comcast.net www.davidlovepianos.com -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Cal Munson Sent: Monday, October 22, 2007 8:56 AM To: pianotech at ptg.org Subject: hammer bore distance Hello List, I have gotten some hammers bored recently and have discovered in putting them on that the bore distance is about 1/4 inch greater than on the old set. Using a let-off jig, a small level and a gauge to measure the string height, I checked my hunch and it appears that the bore is indeed 1/4 inch too much (shank does not get all the way up to perpendicular) I am wondering what would be considered reasonable tolerances in the ideal bore distance? Cal Munson -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20071023/1ec0db85/attachment.html
This PTG archive page provided courtesy of Moy Piano Service, LLC