the magic line

[Overs Pianos]

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Quentin,

>Does anybody have a picture or drawing showing the "magic line" in 
>the action, going from the capstan, I think?
>
>Andre Oorebeek told me about that yesterday but I would really like 
>to see a drawing of it.

If you look at my introductory web page on the Overs action, you will 
find two drawings of our action, shown at rest and in the check 
position.

http://overspianos.com.au/actn.html

The two magic lines which Terry mentioned are shown on both drawings. 
You will notice that with our action the contact points between the 
capstan/wippen heel and the roller/jack pass through the line of 
centres at half key dip.

The drawing which shows the action in the check position has a third 
magic line drawn - the magic line between the repetition lever centre 
and the hammer centre. In the Overs action the contact between the 
repetition lever and the roller sits on this magic line when the 
hammer goes into check. In a conventionally laid contemporary action 
this contact is way off line. This is a minor point perhaps, but it 
allows the repetition lever spring to work as intended with the a lot 
less tension. We've done tests with a 10.5 gram bass hammer with our 
action and an S&S model. The repetition lever loading on the roller 
at check was around 80 grams for the S&S and around 60 grams with our 
action. With our action, the hammer goes into check, even when the 
action is played very softly. When regulating, we have to be quite 
slow in rising the hammer to view the drop position, to prevent the 
hammers from falling back into check.

I'm currently fitting an Overs action to another manufacturer's 225 
grand piano. There will be an AB comparison with two otherwise 
identical pianos from this manufacturer at an Australian music trade 
convention in September. One piano will have a Renner action and the 
other will have an Overs action. Company representatives from the 
piano manufacturer, who has expressed an interest in using our action 
under licence, will be coming to the convention to view the 
comparison.

Ron O.
-- 
OVERS PIANOS - SYDNEY
    Grand Piano Manufacturers
_______________________

Web http://overspianos.com.au
mailto:ron@overspianos.com.au
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