[pianotech] Petrof Specs

[jrpiano]

When I change it to inches the key height would be about 2.51968504". It is 2 3/8".
Hammer blow at inches is 1,81102392 so 1.8"
Thank you,
John Ross
Windsor, Nova Scotia, Canada
jrpiano at win.eastlink.ca
  ----- Original Message ----- 
  From: Paul T Williams 
  To: pianotech at ptg.org 
  Sent: Friday, August 13, 2010 5:27 PM
  Subject: Re: [pianotech] Petrof Specs


  Do you have the Randy Potter Piano Action Handbook?  It says: Key height: 64mm Sharp height: 12.3mm, Blow at 46mm, letoff at 3-1.5mm, Key dip at 10mm, and backcheck distance at 15mm.  I would say your 1-7/8" blow is too low. 

  Paul 



        From:  jrpiano <jrpiano at eastlink.ca>  
        To:  Pianotech List <pianotech at ptg.org>  
        Date:  08/13/2010 02:54 PM  
        Subject:  [pianotech] Petrof Specs 


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  I need the help of the list again. 
  I have a Petrof small grand I am trying to regulate. 
  When I try hammer to string of 1 7/8" the hammer rests on the rail. 
  When I measured the key height, it is 2 3/8" not 2 1/2". 
  Anyone know what it is supposed to be? 
  Thank you, 
  John Ross
  Windsor, Nova Scotia, Canada
  jrpiano at win.eastlink.ca 




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