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
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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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