[pianotech] Blocks

[Dale Erwin]

Dave/ Ron
 As many know we make a quarter sawn maple block with a 5 mm delignit top cap. Trix always put 4 coils on the pins in the top treble section as per original for the reasons of the pin depth issue stated below. After noticing the difference in torque from plain wire to bass strings we  drill our treble with the usual 6.5 mm bit(.2557 and are trying a block drilling the bass with a 6.4 which equal .252 to see if we like the feel better.
 Since the wire is thicker in the bass and makes for a taller coil the other solution is insert a longer pin. Any thoughts on that? seems to me 6 one way and 1/2 dozen the other.Dunno


Dale Erwin R.P.T.
Erwin's Piano Restoration Inc.
 Mason & Hamlin/Steinway/U.S. pianos
www.Erwinspiano.com
Phone: 209-577-8397

 
  





-----Original Message-----
From: David Love <davidlovepianos at comcast.net>
To: pianotech <pianotech at ptg.org>
Sent: Mon, Oct 22, 2012 1:19 pm
Subject: Re: [pianotech] Blocks


An argument for continuing the old tradition of four coils in the top
section.  

David Love
www.davidlovepianos.com


Not just Steinway. I always speculated that it is because the treble is 0.1"
deeper in the block, the string coil is 0.066" smaller in diameter for the
same size pin, and the tension is 200lbs less.

Ron N


 
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