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 > <BR><BR><BR>**************<BR>A Good Credit Score is 700 or Above. See yours > in just 2 easy steps! > (http://pr.atwola.com/promoclk/100126575x1220439616x1201372437/aol?redir=http:%2F%2Fwww.freecreditreport.com%2Fpm%2Fdefault.aspx%3Fsc% > 3D668072%26hmpgID%3D62%26bcd%3DfebemailfooterNO62)</HTML> > _________________________________________________________________ Chat with the whole group, and bring everyone together. http://go.microsoft.com/?linkid=9650735 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20090313/74724966/attachment-0001.html>
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