Here is yet another of those "red faced" moments: Patient: old Kranich & Bach grand (strike one) took the action out to do some bench work to make playable only, for a friend (strike two) Upon return, (oh, it should only take me an hour) I ended up having to re-regulate just about everything 'cause the keyframe was so flimsy or the keybed wasn't flat! All the work on the bench was wasted! (strike threeeeee, yer out!) Anyway, without careful premeasuring, etc.... it's easy to end up with surprises when the action is back in the piano. Check dip, and all the other perameters, I bet something doesn't measure like it did on the bench! Ron Koval Date: Thu, 14 Mar 2002 18:45:04 0000 From: "Phillip L Ford" <fordpiano@lycos.com> Subject: Bass hammer checking Yesterday I worked on an older Baldwin with a Schwander action that had a characteristic that I've encountered on other grand pianos, some having it more than others. The hammers check perfectly on the bench or when the action is pulled out in your lap, but won't check when the action is in the piano. This behavior is usually only noticeable in the low end of the scale and becomes most pronounced at the bottom. On some pianos it seems that you can't get the hammers at the bottom end to truly check no matter what you do; make the checking shallower, make it deeper, groove the tail, rough up the check leather, change the back check angle, reduce rep spring strength to almost nothing, etc. When I say 'truly check' I mean behave as in the rest of the piano. The hammer is held some distance below the string when the key is down and rises when the key is released. Apparently some sort of 'checking' is going on because even on a hard blow the hammers don't bounce back to the strings. But the tail isn't really being held by the backcheck when the key is down. What's the reason for this? Phil F - --- Phillip Ford Piano Service & Restoration 1777 Yosemite Ave - 215 San Francisco, CA 94124 _________________________________________________________________ Send and receive Hotmail on your mobile device: http://mobile.msn.com
This PTG archive page provided courtesy of Moy Piano Service, LLC