[pianotech] Petrof Specs

Paul T Williams pwilliams4 at unlnotes.unl.edu
Fri Aug 13 15:08:24 MDT 2010


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 



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