Grand Touch

[Absolute Piano]

David hits the nail on the head. As inertia is defined as mass x velocity, there is an equal trade off in the weight verse the position of leads. So we should be talking about the limit of acceptable FW. In my experience if the lowest key starts with front weight in the mid-forties (grams) where the FW matches the strike weight in its curve, there will be that inertia dampening effect (pardon the Star Trek jargon).


Jude Reveley, RPT
Absolute Piano Restoration, LLC
Boston, Massachusetts
  ----- Original Message ----- 
  From: David Love 
  To: 'Pianotech List' 
  Sent: Tuesday, July 11, 2006 8:55 PM
  Subject: RE: Grand Touch


  With respect to the question of how many leads it has as much to do with position as number and really boils down to the overall front weight of the keys.  If there are a lot of leads or if they are all pushed way forward on the key, a high measured front weight can introduce inertial problems such that even if the static weigh-off is light the dynamic performance can suffer from a feeling of sluggishess.  That's why overcoming weight problems by simply adding more lead can be counterproductive.  How many leads and their position in the key will give you a quick indication if there might be a problem in this area.    



  David Love
  davidlovepianos at comcast.net
  www.davidlovepianos.com 

  -----Original Message-----
  From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Farrell
  Sent: Tuesday, July 11, 2006 5:28 PM
  To: Pianotech List
  Subject: Re: Grand Touch



  Well, really is it simple - how many leads? My recollection from Stanwood classes that I have attended is that ideally an action will have three - two - one - zero lead in keys running from bass to treble. The implication is that if more lead is required, then maybe action geometry needs to be looked at. I don't know that four leads is any death pronouncement, but it may be a reason to look closely at many factors.



  Terry Farrell

    ----- Original Message ----- 


     

    Yes, a rather vague and not very helpful statement Terry, I agree.  But how do you answer a question such as  'how much lead is there in the keys?'   If I remember rightly there are 4 in the lower bass.

    ric
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