At 15:32 +0200 22/6/08, ricb at pianostemmer.no wrote: >...The design simply calls for the shank to be 3 mm higher at the >end of the shank then it would be if it was horizontal at impact. >Nothing like straight forward advice. >... >Following the above advice has worked out perfectly. Very easy to get >close to a perpendicular to string orientation without draconian >rakes. Well, supposing the strings are horizontal right up to the top, which they can be in a Bechstein, and supposing that you make no allowance for facing and wear, then 'draconian' or not, the heads will need to be raked outwards 1.32 degrees. If you allow for 1 mm. of lost length between boring and finishing, which is reasonable, then you will need to bore for an outward rake of 1.76 degrees. JD
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