[CAUT] Slipping Beckets

[Albert Picknell]

Thanks for your comments, Del.  The Diamond pins are made by Klinke in Germany, and sold by Pianotek.  The holes in the Diamond pins don't look any bigger than those in Denro and Yamaha pins (in fact they may be slightly smaller), but the edges of the holes are definitely more rounded than the others (see attached photos).  As to whether they are plated after drilling, it's hard to tell.
 
In the photos, the pins are: Denro on the left, Diamond in the middle, and Yamaha on the right.  All three pins are new.
 
Cheers,
Bert
 
 
--- On Thu, 2/4/10, Delwin D Fandrich <del at fandrichpiano.com> wrote:


From: Delwin D Fandrich <del at fandrichpiano.com>
Subject: Re: [CAUT] Slipping Beckets
To: caut at ptg.org
Received: Thursday, February 4, 2010, 1:17 PM








Bert,
I’m not familiar with Diamond brand tuning pins but there are several things that I am aware of that can result in slipping wire:
n  Large holes through the pins. Many tuning pins have holes that are too small to accommodate the 0.063” (1.6 mm) diameter wire used by some for the core wire of the lowest mono-chord bass strings. If one is to use wire of this diameter it is necessary to drill out the hole of a few pins. In years past—many years past—some pins came with holes large enough for the largest core wires ever conceived by the devious minds of the piano designers of a century or so back. Smaller treble wire wound on these pins—especially nickel plated pins with their lower surface friction—tended to pull out. Tuning pin makers responded by making the holes smaller ending one problem but making it necessary for traditional makers and rebuilders to drill out a few pins. 
n  Plating through the hole. In addition to the bend at the hole wire depends on a certain amount of friction to hold it in place. If the plating was done after the hole was drilled or punched the surface might be too slick to hold the wire. 
n  Rounded edges. Depending on how the hole in the pin was put there it is possible for one end of the whole to have a slightly rounded edge. This, along with a slick, plated surface, can cause smaller wires to slip out of the hole. 
  
ddf 
  
Delwin D Fandrich 
Piano Design & Fabrication 
620 South Tower Avenue 
Centralia, Washington 98531 USA 
del at fandrichpiano.com 
ddfandrich at gmail.com
Phone  360.736.7563 


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