Keep on filing...(picture attached)

[Joe And Penny Goss]

Just a thought,
Should the pinning of the jack be looser than that of the wippen so that  jack's needs are taken care first?
When Jack is happy!
Joe Goss RPT
Mother Goose Tools
imatunr at srvinet.com
www.mothergoosetools.com
  ----- Original Message ----- 
  From: Porritt, David 
  To: Pianotech List 
  Sent: Friday, June 22, 2007 9:06 AM
  Subject: RE: Keep on filing...(picture attached)


  Ric:

   

  You need to read more carefully.  Dean said " If you increase the resistance of the pinning, you must also increase the spring tension to overcome this resistance for a given hammer lift."  Of course the spring tension doesn't get increased until you increase it.  The point is you can increase the tension helping to return the key and hammer without making a jumpy hammer.

   

  dp

   

  David M. Porritt

  dporritt at smu.edu

  -----Original Message-----
  From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Richard Brekne
  Sent: Friday, June 22, 2007 10:29 AM
  To: pianotech at ptg.org
  Subject: Keep on filing...(picture attached)

   

  Oh come on Dean... for criminees sakes... spring tension isnt increased 

  until you actually increase it. Nobody said anything in previous posts 

  about maintaining <<a given hammer lift>>.  But since you first mention 

  it... have you ever actually tried seeing what happens to hammer lift 

  for a say.... 5 gram change in rep pinning resistance ?  I havent.. and 

  cant really say I know what the result would be.  But I would imagine 

  (as in guess at) that you probably would not see all that much a change. 

  Another little tidbit to check out tho... good fun.

   

  Cheers

  RicB

   

   

      Ric wrote: After all.. the spring tension is not actually increased.  

   

      Seems to me it is. If you increase the resistance of the pinning,

      you must

      also increase the spring tension to overcome this resistance for a given

      hammer lift.

   

      Dean

   

      Dean May             cell 812.239.3359

   

      PianoRebuilders.com   812.235.5272

   

      Terre Haute IN  47802

   
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