HeLp! How do I regulate the jack to those 45 degree, slanted knuckles? (Please)

[gordon stelter]

--- Farrell <mfarrel2@tampabay.rr.com> wrote:
> "Certainly anyone who would notice that miniscule an
> amount of friction should be playing a grand (?)."
> 
> Yeah, but.......  These are going into a Mason &
> Hamlin upright that is being completely
> remanufactured. AND this piano is getting my first
> soundboard. One thing I DON'T want to happen is
> showing the piano to a good pianist to demonstrate
> that fabulous soundboard, and having them bet hung
> up on this slow action that I also just spent 150
> hours rebuilding! I think we all know that the
> weakest link is what will determine the overall
> desirability of a piano.
> 
> I'm concerned that there will be this mushy little
> feel right at the end of the keystroke. Or if it
> lets off just prior or at the same time as the
> friction begins, it may steal a little power. I
> figure MY mistakes on this piano will be conspiring
> to limit some of its performance - I don't need any
> identifiable and controllable sources adding to it!
> Therein lies my concern.
> 
> Terry Farrell
>   
> ----- Original Message ----- 
> From: "Dave Nereson" <dnereson@dim.com>
> To: "Pianotech" <pianotech@ptg.org>
> Sent: Wednesday, April 23, 2003 11:17 PM
> Subject: Re: Asian Hammer Butt Spring String
> Friction
> 
> 
> 
>   ----- Original Message ----- 
>   From: Farrell 
>   To: pianotech@ptg.org 
>   Sent: Wednesday, April 23, 2003 3:58 PM
>   Subject: Asian Hammer Butt Spring String Friction
> 
> 
>   Asian Hammer Butt Spring String Friction - say
> that 3 times real fast........
> 
>   Problem: Renner Asian-type upright hammer butts
> with the integral spring and flange cord and steel
> plate that retains the flange center pin. The flange
> cord forms an acute angle that faces the width of
> the steel center pin retainer. When the butt is at
> rest, the flange cord is a millimeter or so away
> from the edges of the steel plate. As the hammer is
> propelled forward toward the strings, the apex of
> the flange cord angle gets closer to the steel
> flange and so the opening of the angle gets smaller.
> Prior to the flange being parallel to the shank
> (which is pretty close to the position when the
> hammer would hit the string), the flange cord comes
> into contact with the edge of the steel plate and
> for the short distance to the flange aligning with
> the hammer shank, the flange cord drags along the
> edge of the steel plate. 
> 
>   I can feel the resistance in the flange. I can't
> imagine it should be like that. I just bought these
> hammer butts from Renner. Has anyone ever noticed
> this before? Does this occur on Yamahas? Any
> thoughts on how this might affect performance? I'm
> inclined to reject these hammer butts, but I've been
> know to obsess over trivial matters before (good
> enough won't cut it here). Any thoughts?
> 
>   Terry Farrell
>     
>   _______________________________________________
>   pianotech list info:
> https://www.moypiano.com/resources/#archives
> 
>   Yes, I've encountered this, but it was in a piano
> that was also mice-infested, and I thought the mice
> were chewing the spring loops, which they may have
> been.  I dunno, maybe the cords need to be made of
> nylon or kevlar or some other space-age material. 
> Or all the butt plates need to be rounded off and
> polished.  Or get butts with longer spring loops. 
> There are Schwander-type butts without the butt
> plates, also (conventional pinning).  Haven't
> noticed the problem on Yamahas -- maybe their loops
> don't rub.  Don't Kawais and other Asian pianos have
> the same type butt?  I doubt the friction is enough
> to affect performance.  Certainly anyone who would
> notice that miniscule an amount of friction should
> be playing a grand (?).    --David Nereson, RPT
> 
> _______________________________________________
> pianotech list info:
https://www.moypiano.com/resources/#archives


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