[pianotech] JD... Grams, swings and centre pin sizes

John Delacour JD at Pianomaker.co.uk
Sun Jan 18 22:52:08 PST 2009


At 20:17 -0500 18/1/09, KeyKat88 at aol.com wrote:

>>In a message dated 1/8/2009 2:12:48 P.M. Eastern Standard Time, 
>>JD at Pianomaker.co.uk writes:
>>
>>What may be right for a Steinway flange is not going to be right 
>>for a Schwander flange, with or without washer.  A Steinway flange 
>>has its centre of gravity about 12 mm from the centre and weighs 
>>about 3.05 grams, whereas a Schwander flange with washer has the 
>>COG 20 mm from the centre and weighs 5.20 grams.

>When you mention the flange's center of gravity as for example the 
>Steinway one (above),Êis that 12mm measurementÊtaken from side to 
>center of flange, or from it's side to the center of the flange 
>screw hole, or from the front to theÊcenter of flange or from 
>flange;s rear to center?ÊPlease expound/clarify.

When I say "12 mm from the centre" I am talking of the hammer centre 
-- the fulcrum, the pivot, the axis.

JD



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