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. That makes a huge difference in the initial turning force already acting
at the centre before you add your weight at the screw hole, which will be
23-24 mm from the centre in both cases. And then you can make things even
vague by saying the flange should just move when you put the screw in it. Which
screw? The oversize Steinway screw weighing 3.8 grams or the Bechstein screw
that weighs only 2.85 grams.
Greetings,
When you mention the flange's center of gravity as for example the
Steinway one (above), is that 12mm measurement taken from side to center of
flange, or from it's side to the center of the flange screw hole, or from the
front to the center of flange or from flange;s rear to center? Please
expound/clarify.
Thanksd
Julia Gottshjall
Reading, PA
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