Bechstein B hammer rake / more thoughts

[Richard Brekne]

Hi Stéphane and whomelse ever.

Been digging through the archives and find that this querrie of mine 
dont seem to have an answer.  A couple interesting posts that are 
relevant... First one from Dale Erwin where this bit about the 
horizontal shank at impact being important comes up.

https://www.moypiano.com/ptg/pianotech.php/2006-November/198133.html

Then a similiar instrument to my own is being discussed in the following 
exchange between David Love and Jon Page back in 2002 where Jon more or 
less tells us to give up trying to make either boring protocol work. He 
does go for the hammer being perpendicular to the string at impact, but 
the angle to the shank is a whatever works affair.  Jon starts this by 
saying one has to basically throw out the string distance minus center 
pin distance approach on Bechsteins.

https://www.moypiano.com/ptg/pianotech.php/2002-April/106174.html

All this and more reading leaves me narrowing in on a conclusion that we 
dont actually have a bonified bore distance formula that we can really 
count on.  Now that doesnt sit right for some reason.  There should be a 
way of calculating a more then usuable bore length and rake angle given 
a few basic measurements.  Still seems obvious that the one thats been 
defacto standard as long as I've been reading this list is undependable.

Cheers
RicB