[pianotech] beginner's calibration question

[Joe Goss]

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
>>
>>
>