Whilst we have been getting so very precise about our fork at 440, at a consistent temperature let's remember that the piano will vary depending on the temperature and relative humidity that will vary each day. While the A might be at exactly 440.000000000 when you pack up your tools, it will be something slightly different when you open the door to leave. While we as professionals have (probably necessary) obsessive/compulsive disorder we can cross the fine line of insanity pretty easily. Remember the beckets! dp David M. Porritt, RPT dporritt at smu.edu From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of William Monroe Sent: Tuesday, December 29, 2009 8:04 AM To: pianotech at ptg.org Subject: Re: [pianotech] Beginner's calibration question SNIP Zoe, if your fork really is at the wrong pitch at 20C (check it against the website above), I'd be inclined to buy a new one. Best regards, David Boyce David, Why would you be inclined to buy a new one? As has already been discussed in this thread, it has been standard practice for decades (probably in the hundreds of years, now) to "tune" or calibrate your tuning fork for the temperature at which you plan on using it. Even slight variations in temperature will change the frequency of the fork. Perhaps yours is at 440 at 20C, but I'll guarantee you that every piano you tune is not in a 20C environment. Your fork will be off in those settings unless you have a practice for equilibrating your fork to 20C prior to setting the A. -- William R. Monroe, RPT -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20091229/123e9a56/attachment.htm>
This PTG archive page provided courtesy of Moy Piano Service, LLC