Action Ratio and Dip and Blow and Etc.

[Absolute Piano]

I agree with David except you don't have much room to rob from your aftertouch, so you may have to find some compromise between your blow distance and dip. I like .040" for aftertouch. Otherwise, it looks sweet. Now for the work, right ;).

Jude Reveley, RPT
Absolute Piano Restoration, LLC
Lowell, Massachusetts
(978) 323-4545
  ----- Original Message ----- 
  From: David Love 
  To: 'Pianotech List' 
  Sent: Sunday, July 08, 2007 3:20 PM
  Subject: RE: Action Ratio and Dip and Blow and Etc.


  I prefer a shorter blow and less dip.  10 mm dip is my target.  10.25 on a concert grand.  Otherwise, it looks good.  5 g friction is slightly high for the shank.  Three grams would be my preference.   Different manufacturers have different specs and performance on the flange pinning.  



  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: Sunday, July 08, 2007 12:10 PM
  To: Pianotech List
  Subject: Re: Action Ratio and Dip and Blow and Etc.



  As suggested, I fully regulated my sample note #40 and regulated friction. Friction in key is <2g, wip flange is 2-3g, shank flange is 5g (it was next to zero).



  Here's how things shake out:



  DW - 50g

  UW - 25g

  F - 12.5g

  BW - 37.5g

  R - 5.7

  SW - 9.0 (medium to medium-low)

  FW - 19.35 (65% or FW max 30g)

  KR - 0.52

  Knuckle - 17mm

  Action Spread - 114.5mm



  Blow - 47mm or 1-7/8"

  Dip - 10.65mm or 0.42"

  Letoff - 1.65mm or 1/16"

  Aftertouch - 0.85mm or 0.030"



  I know my letoff is set real close. I could also lessen blow to 1-3/4 which would give me a dip of 9.94mm or 0.39"



  Below is pic of leading on #40 (natural in center with 12g lead sitting on top at rear of key cover)









  Below is action at rest









  Below is action at full keystroke (w/ moderate pressure on key - the heavier end of my Spurlock gram weight set)









  Full keystroke again, but here you can see knuckle clearing the knuckle, and just kissing the fuzzy exterior of the jack cushion.









  I'm thinking I got this puppy licked. Am I missing anything? Anyone see something that is out of whack? Can I assume that if I can do 87 more notes like this one that I'll have one slick-playing action? Anything else that would/could improve it?



  My next post will contain many thank-you's. I'm afraid if I attempted to try to do justice to that need here, this post would get bumped for being too large!



  Jude - you were right about the rep lever pinning - I removed the spring from it and it was blowing in the wind - zero friction. I repinned it for 5g.



  And Jon - you mentioned that the capstan/heel magic line is out the window. Actually, the reason I put that heel extension on there was to get the contact on the magic line - it was way above it originally. You could just watch the original capstan slide along the heel. Now, the contact is right on the magic line at half blow and they move together is perfect unison - no sliding.



  Now, the rep-lever/knuckle contact of way out the window - lots of sliding there. Oh well. Thank goodness for Spurlock Teflon powder.



  Terry Farrell
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