[pianotech] regulating backchecks?

[Greg Newell]

But Ron, you come from more than 25 miles away. You MUST be an expert!!

Greg Newell
Greg's Piano Forté
www.gregspianoforte.com
216-226-3791 (office)
216-470-8634 (mobile)

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Ron Nossaman
Sent: Wednesday, July 29, 2009 10:50 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] regulating backchecks?

jim ialeggio wrote:
> In a well regulated action with backchecks in optimal regulation, is it 
> reasonable that backchecks should be catching all the way down to /mp/ 
> or  even /p/ key strikes? or is that asking for too much?

I think it's quite reasonable, whatever the stand of a certain 
famousmaker with a different opinion reflecting field 
performance of their pianos. It depends on the usual known but 
selectively ignored parameters. Given a performance derived 
(rather than manufacturer spec) hammer tail length, hammer 
tail contour, backcheck angle, checking height, repetition 
spring strength, and rep lever center friction, in roughly 
that order, there's no particular mechanical reason that 
hammers shouldn't check reliably in those ranges.

But I'm just a mechanic. This probably needs an expert.
Ron N