And from that you can deduct the bore length. In the case of 90° your shank has to be parallel with the string. He said that it does not matter what you do, as long as the the hammer hits the string in an angle of 90 °. I had a discussion with Joachim Leonardy of Jahn about this. Matthias Stöckle (Renner Germany) prefers 93°. I have done a Bechstein where I forgot to rake the top half octave, but a little felt removal achieved the clearance.Ī rake angle of 93 to 94 degrees is normal in European pianos. This means the stated goal is often not actually achieved, as the factory adjusts stack elevation to compensate for inevitable inaccuracies in design specification of the action cavity.Īgraffes up to 88, Chickering and Bechstein, does require some rake to achieve clearance to the plate. So the only real way to achieve the stated goal is to custom bore.but that doesn't always happen in a factory installation. Further, a generic bore may not have any of the shanks at 90 deg, depending on how the stack elevation was set up relative to the generic bore. A generic bore will have some parts of the scale at 90 deg and some parts not at 90. But, keep in mind, this only happens if you custom bore. I agree with everything Michael said above, with these additions.
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