Key Friction

[Terry]

----- Original Message ----- 
From: "Richard Brekne" <Richard.Brekne@grieg.uib.no>
To: "Pianotech" <pianotech@ptg.org>
Sent: Thursday, January 06, 2005 3:45 PM
Subject: Re: Key Friction


> Actually... Terry turned me on to this idea... you do it the same way as 
> you take balance weight... except the stack is off so there is nothing 
> on the keys.  I like to put about 50 grams of weight on the back of the 
> key and then just take up and downweight measurements.
> 
> Three points of interest that and they have a suprisingly larger affect 
> then most of us take for granted me thinks....  Balance rail pin, front 
> and back bushings.  I'm also starting to get in the habit of gluing a 
> very thin strip of 0.3 mm thick paper on either side of the balance rail 
> hole.  Makes for a little more precise fulcrum point. Seems to even out 
> end ratio a bit... tho I havnt gotten around to really looking closly as 
> to why.
> 
> Cheers
> RicB
> 
> Barbara Richmond wrote:
> 
> > Ric,
> >
> > I haven't gotten that far in my studies.  How do you measure that?  
> > I've just always adjusted keys the "old" way--by touch--how the key 
> > slides down the balance pin and the fit of the bushings.
> >
> > Barbara Richmond
> > (I wanna be a touchweight freak.)
> 
> 
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