[pianotech] Action Ratios Recap - non-ideal approach

[William Truitt]

I thought that perhaps JD was referring to the half barrels (as some call
them), but he did not mention them in his post today - although from his
explanation about the profile of the balance rail, it is not hard to
understand why they might be considered advantageous.

One thing I have noticed about the accelerated action bearings is key hole
wear. Admittedly, I have a very limited sample body of Steinway pianos with
these bearings, and it is therefore dangerous to try to draw conclusions
about the performance of this system as a whole, but it is my observation
that pulley keys seem to develop more quickly with the AAB than the
traditional balance rails.  Whether that is also attributable to less dense
key wood stock, I cannot say.  

Other's mileage may vary, but that is my observation from my limited sample.

Will

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Ron Nossaman
Sent: Wednesday, January 20, 2010 12:33 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] Action Ratios Recap - non-ideal approach

erwinspiano at aol.com wrote:
>  Will
>   The only way to tidy up the pivot point on any balance rail would be 
> to cut the front edge of each punching. Come to think of it, wouldn't 
> the accelerated action bearings be a superior idea considering the above 
> stated premise?
>   Dale

Yes it would, as I've pointed out on list before.
Ron N