[CAUT] Bluthner Action

[Richard Brekne]

Hi Steve

This description of the action is one that has been floating around on 
the net in one form or another for many years now. The translation of 
the directions from the German was pretty bad and you will find some of 
the points do not match the picture so well. We had a discussion about 
this a couple years back either on Caut or on Pianotech where we hashed 
out a pretty good set of directions, but I havent gotten around to 
re-writting yet.

The points on the list do not correspond to the picture. The list of 
directions is a step by step regulating procedure. The parts description 
that used to accompany the picture has been lost. I've yet to find it.

In particular points 6 on the list of directions referers to point 9 on 
the picture. Point 8 on the picture is a kind of repetition jack spring 
and is not mentioned in the regulation procedure at all. It needs to be 
strong enough to avoid a kind of CAF effect that can occur but at the 
same time not so strong as to yield a clicking sound created when the 
jack releases back into the stop felt on the abstract (point 7 on the 
picture).  That felt can get compacted over the years as well and can 
need replacement. Point 4 on the list can be read as "key dip" instead 
of "touch"  Let off is suppose to occur such that the jack comes out 
from under the abstract nose (knuckle) just as the bottom of the key 
hits the front rail felt punching (called baize in the list).  The 
hammer shanks at rest should be on the hammer rest rail. Thats regulated 
so that the blow distance is 45 mm. You start with blow and a default 
key dip of 9.4 mm, go through to point 6 and then recheck that your keys 
are touching the key front felt punching at letoff... then proceed.

Cheers
RicB

    http://www.pianostemmer.no/files/Bluthneraction.doc
    Debbie  Cyr

        In a message dated 12/9/2009 8:57:24 A.M. Eastern Standard Time,  
        shsnyder1 at verizon.net writes:

        What can  anyone  tell me about this Bluthner piano action    
        Thanks!

        Regards,
        steve


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