[pianotech] pin Driving Fluid - was hybrid pinblocks

[erwinspiano at aol.com]

Joe what model of Block are you driving these days?
  Dale






-----Original Message-----
From: Joseph Garrett <joegarrett at earthlink.net>
To: pianotech <pianotech at ptg.org>
Sent: Thu, Feb 18, 2010 7:17 am
Subject: [pianotech] pin Driving Fluid - was hybrid pinblocks




Gene said: "One more thing about this has my curiousity.
The brief experimenting that we did involved dilignit and multi lam from Piano Tech. One sample of each cut about 2"x4"by about 5/8" thick. Not glued together - kept separate.
Double drilled first .25" then two 6.8mm holes and two 6.9mm in each sample.
Drove 2.0 pins into each hole. Two were dirven in about half the length of the pin and the others driven in to a normal height of the becket above the block.
In each sample the pins that had been driven more were noticably looser than the pins that had been driven less. Also, we did not notice any torque differences between samples.
The message that I get from this is that the lower part of the pin in a normal thickness block - regardless of the material it is made with - will tend to be tighter than the upper part of the pin. I suppose that more wood fibers are being damaged in the upper part of the block.
This is what led me to inquire how the hybrids are evaluated."
 
Gene,
Hence, the reason for Pin Driving Fluids, IMHO.
Joe

 
 
Joe Garrett, R.P.T. (Oregon)
Captain, Tool Police
Squares R I
 
 


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