springs vs. lead

[Michael Gamble]

Hello David and List
I like it! Magnetic forces - what are the downsides?
Regards
Michael G.(UK)
----- Original Message ----- 
From: "David C. Stanwood" <stanwood@tiac.net>
To: <pianotech@ptg.org>
Sent: Wednesday, May 11, 2005 12:19 PM
Subject: Re: springs vs. lead


>
>>
>>We all come across noise from springs in pedals.   Why couldn't we 
>>eliminate the spring and use key leads inserted into, for instance the 
>>damper lifter tray, pedal levers...places where springs are used to return 
>>parts...?
>>
>>David Ilvedson
>
>
>>Just a guess here David, but I would think you would have to use an awful
>>lot of lead to get the return rate that you get with springs.  Springs 
>>allow
>>for a graduated resistance, increasing as the pedal is depressed further.
>>Weighting might also allow the upper assy. (e.g. tray) to loose contact 
>>with
>>the trapwork levers, causing some knocking noise.  Speculation here. 
>>Maybe
>>not............
>>
>>Respectfully,
>>William R. Monroe
>
> How about coupled pairs of opposing and attracting strong magnets?
> You'd have force without contact and no mass.
>
> D Stanwood
>