On Thu, 20 Aug 1998, Robert B Edwardsen wrote: > Jim Coleman, Sr. wrote: > > > Hi Don: > > > > Did you by any chance shorten the hammer boring distance in order to get > > a longer tail? This could cause all kinds of problems. > > > > Please understand, I'm not criticizing you. You may have just copied the > > problem that was there from before. > > > > Jim Coleman, Sr. > > > > Hi Jim: > > Do you always bore your hammers in relation to string height rather than > copying the original (of course compensating for wear)? > > Rob Edwardsen Hammer bore is determined by taking the string height, subtracting hammershank flange centerpin height (from the keybed -- in the piano!), and adding a tiny amount (I add 1/32") to take into account filing. Copying the original bore distance would be next to impossible because you don't know how much felt's been removed. Even so, copying the original -- if it was wrong from the git-go -- just isn't a good idea. If you replace the pinblock and the new one it thinner or thicker than the original, you may have changed the string height. That would throw off the original boring specs. Ron Torrella, RPT Piano Technician University of Michigan School of Music
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