[pianotech] Bobbling hammers and jack spring pressure?

Ryan Sowers tunerryan at gmail.com
Sat Jan 24 09:09:24 PST 2009


I had not heard of the Brinsmead before! I googled it and found some very
interesting information. Thanks for the post!

On Sat, Jan 24, 2009 at 5:21 AM, John Delacour <JD at pianomaker.co.uk> wrote:

> At 19:48 -0500 23/1/09, Dean May wrote:
>
>  I learned that adjustment technique on this list a couple of years ago. To
>> restate: make sure that when the damper pedal is on, the keys do not
>> contribute towards any lift on the dampers. This is for a vertical piano
>> only.
>>
>> The opposite is true for a grand. On a grand when the damper pedal is on
>> the keys should lift the dampers slightly off the tray. Otherwise if the
>> pedal raises and lowers the dampers off the key when the key is depressed,
>> the pianist will feel it.
>>
>
> That means that right at the end of the keystroke you would have the added
> weight of the damper coming in, which would make sensitive playing very
> difficult.  The pedal should always raise the dampers higher than they can
> be lifted with the key.  The only exception I know of is the Brinsmead, the
> geometry of which is such that the key always begins to lift the damper at
> half-blow, so that the touch is always the same, whether or not the damper
> pedal is depressed -- a very clever arrangement.
>
> JD
>
>
>
>
>


-- 
Ryan Sowers, RPT
Puget Sound Chapter
Olympia, WA
www.pianova.net
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