[pianotech] S & S Bearings...was Punching Trick???

[David Love]

Not exactly.  When you remove the roller bearing and go to a flat punching
you can add a bottom shoe to the keystick that's the same thickness as the
roller bearing you just removed making the key taller and thus stiffer (as
with any beam).   Some time back this was addressed here possibly under the
heading of "action saturation" referring to the phenomenon of diminishing
returns on the production of hammer speed with increasing accelerating of
the front of the key because of key flexing.   

 

David Love

www.davidlovepianos.com

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Kerry
Sent: Monday, January 11, 2010 5:34 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] S & S Bearings...was Punching Trick???

 

Meaning the flexing of the keystick? How would that work? By increasing the
fulcrum contact area? 

 

 

Kerry Kean

www.ohiopianotuner.com <http://www.ohiopianotuner.com/> 

 

  _____  

From: David Love [mailto:davidlovepianos at comcast.net] 
Sent: Monday, January 11, 2010 3:52 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] S & S Bearings...was Punching Trick???

 

I've heard of people removing the bearing and increasing the key height
proportionally to reduce flexibility.  Going the other direction seems like
it could be a problem.

 

David Love

www.davidlovepianos.com

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Kerry
Sent: Monday, January 11, 2010 11:03 AM
To: joegarrett at earthlink.net; pianotech at ptg.org
Subject: Re: [pianotech] S & S Bearings...was Punching Trick???

 

What about the key height?

 

 

 

Kerry Kean

www.ohiopianotuner.com <http://www.ohiopianotuner.com/> 

 

  _____  

From: Joseph Garrett [mailto:joegarrett at earthlink.net] 
Sent: Monday, January 11, 2010 1:16 PM
To: pianotech
Subject: [pianotech] S & S Bearings...was Punching Trick???

 

On a related note, has anyone retrofitted a standard keyboard with S&S

bearings? How much difference did it make and how much trouble was it?

Thanks in advance to anyone who can answer any of these.

 

I have done that on two pianos. One was the Irish P.O.S. with all plastic
parts, including keys. I liked the concept and found that it worked well in
that application. The only thing needed that would be out of the ordinary is
the longeer balance rail pins. Made a good retrofit project.

Joe

 

 

Joe Garrett, R.P.T. (Oregon)

Captain, Tool Police

Squares R I

 

 

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