Don't forget that any grinding you do will heat the fork up so you have to wait for it to cool down before you decide if it needs more grinding. It's a tedious job grinding, waiting, measuring, more grinding, more....... dp David M. Porritt, RPT dporritt at smu.edu -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Joe Goss Sent: Monday, December 28, 2009 4:12 PM To: pianotech at ptg.org Subject: Re: [pianotech] beginner's calibration question At the saddle if flat at each tine if sharp Joe Goss BSMusEd MMusEd RPT imatunr at srvinet.com www.mothergoosetools.com ----- Original Message ----- From: "Piano Boutique" <pianoboutique at comcast.net> To: <pianotech at ptg.org> Sent: Monday, December 28, 2009 3:02 PM Subject: Re: [pianotech] beginner's calibration question > Zoe, > > Yes, it is important that the fork be at the temperature you are going to > be using it. Also remember, you want to take the same amount off each > tine. Also, you can just use a wire wheel on a grinder, and you would be > surprised how easy it will take off a little weight. > > Good luck, > > William > > > > ----- Original Message ----- > From: "Zoe Sandell" <yiddishtangofever at shaw.ca> > To: <pianotech at ptg.org> > Sent: Monday, December 28, 2009 3:20 PM > Subject: Re: [pianotech] beginner's calibration question > > >> Thanks John, >> >> My room temp is 20 degrees. I wondered about the specifics of >> temperature- >> certainly the manufacturers could not mean that the fork itself is 20 >> degrees and not the room? As steel will always be colder than its >> surroundings- cannot recall the exact science behind the difference in >> heat >> conductors. I guess the underarm trick simply adjusts the fork enough to >> be >> accurate? >> >> I wonder about the fork- I will take mine into a master tech- to do any >> filing- but this will likely be necessary. >> >> Zoe >> >> >> -----Original Message----- >> From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On >> Behalf >> Of John Ross >> Sent: December 28, 2009 12:12 PM >> To: pianotech at ptg.org >> Subject: Re: [pianotech] beginner's calibration question >> >> If you are sure that the fork is off, remembering that temperature has an >> effect on it, some people put it under their arm for a predetermined time >> before measuring. >> >> As a matter of interest, just how accurate should a fork be? +/- >> what? >> >> The fork frequency can be changed with a file. >> I think I remember correctly, I am sure someone will correct me if I am >> wrong. :-) >> Take some off the tips to raise the frequency, and some off the inner >> part >> of the leg to raise the frequency. >> >> John Ross >> Windsor, Nova Scotia. >> >> >> ----- Original Message ----- >> From: "Zoe Sandell" <yiddishtangofever at shaw.ca> >> To: <pianotech at ptg.org> >> Sent: Monday, December 28, 2009 4:01 PM >> Subject: [pianotech] beginner's calibration question >> >> >> Hello, >> >> I have just completed calibrating my tuning device with NIST and the >> Tunelab >> demo-. When I call back the C5 500Hz marks as in tune- ie squares stay >> still- but my tuning fork reads flat at A440 >> >> How then do I accurately tune the temperament octave to the tuning fork- >> knowing this discrepancy? Get a new/better tuning fork? >> >> Thanks >> Zoe >> >> >
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