[pianotech] Petrof Specs

[Jane Jones]

Hey John,
Contact Paul Rea at Petrof.  He'll be great help! Email him at: service at petrofpianousa.com 
Jane

--- On Fri, 8/13/10, jrpiano <jrpiano at eastlink.ca> wrote:

From: jrpiano <jrpiano at eastlink.ca>
Subject: Re: [pianotech] Petrof Specs
To: pianotech at ptg.org
Date: Friday, August 13, 2010, 4:13 PM



 
 

Great help.
It is somewhere to start.
Now I know why the hammers were on the felt rail, 
which couldn't go any lower.
The piano is from the time when they were made 
behind the Iron Curtain, so I guess I shouldn't expect any specs to be 
close.
I will just try different things to get it to work 
better than it does now.
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 6:08 
  PM
  Subject: Re: [pianotech] Petrof 
  Specs
  
So, raise the blow distance, or 
  lower the key height;  What else might be coming into play? bad geometry, 
  poor action spread?  You might even be having action bracket spread. 
   that'll kill any specs you have and will need to replace the 
  brackets. 

Does this help at 
  all? 
Paul 




  
    
    
      From: 
      jrpiano <jrpiano at eastlink.ca> 
    
      To: 
      pianotech at ptg.org 
    
      Date: 
      08/13/2010 03:58 PM 
    
      Subject: 
      Re: [pianotech] Petrof 
    Specs

  
  


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


  
  


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 
  

  
  

  
No virus found in this incoming message.
Checked by AVG 
  - www.avg.com 
Version: 9.0.851 / Virus Database: 271.1.1/3068 - Release Date: 
  08/13/10 03:34:00 
  
  
  
  

  
No virus found in this incoming message.
Checked by AVG - 
  www.avg.com 
Version: 9.0.851 / Virus Database: 271.1.1/3068 - Release 
  Date: 08/13/10 03:34:00
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100813/84efd26a/attachment.htm>