[pianotech] becket crimping tool

[Tyler Ferrari]

Using steel tools shouldn't be a problem as long as you're not severely reducing the section size of a ductile material when using the tool (string material). You don't run the risk of a stress concentration causing fracture because ductile materials are considerably less susceptible to stress concentrations when compared to more brittle material.

Tyler
BSc Materials Eng.

> From: A440A at aol.com
> Date: Fri, 13 Mar 2009 22:49:23 -0400
> To: pianotech at ptg.org
> Subject: Re: [pianotech] becket crimping tool
> 
> Paul  writes:
> 
> << We never use anything but a brass drift (6" x 1/4" or 3/16") to tap the  
> becket home. Steel tools on piano wire just don't seem like a good idea if it 
>  can 
> be avoided.  >>
> 
> Greetings, 
>      
>    There is about 200 cents worth of flattening that can be massaged out of a 
> coil on a newly strung wire.  Theoretically, the becket will never see the 
> same tension as the speaking lenghth, but there is a way to take a lot of slack 
> out, at the start. 
>      I do this by putting full tension on the wire while the coil is still 
> slightly above level, ( one reason that protruding becket ends are unwelcome). 
> Then I tap it level so that it can tighten as it is moving down the pin. Level 
> means the hole opposite the becket is half covered by the top coil,(another 
> reason for not protruding).   Follow that with a squeeze on the becket and twist 
> the coil firmly in the direction of its rotation, (counterclockwise on a 
> grand)(another reason for not protruding).  Much faster settling.   
>     
>     I haven't had any negative experience with using steel tools on piano 
> wire. I have smoothed all sharp edges off my tools, so there are no nicks, but  I 
> squeeze beckets in and VERY tightly compress the coil with vise-grips.  I tap 
> the coil level with a steel tool, etc.  Never experienced any drawbacks to 
> it, never had a wire break at the coil on my strings or replacement strings, 
> etc.  
> Regards,  
> Ed Foote RPT 
> http://www.uk-piano.org/edfoote/index.html
> www.uk-piano.org/edfoote/well_tempered_piano.html
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