Spring behavior

[Roger Jolly]

Hi Isaac,
                  The geometry of the spring will determine the direction 
of force. (shape of spring). The coil determines how much force is exerted 
down the arms of the springs.  It is important to lift the action and look 
down the line of springs to make sure they all line up like toy soldiers, 
to get consistent touch.
Jim B hit the nail on the head, clean and burnish the slots. so the sliding 
friction is consistent.
A pencil lead, or spray on teflon is all that is needed for lubrication, 
along with a nice clean spring tip
Any grease like material will harden with time and increase the sliding 
friction dramatically.
I have lowered touch weight at much as 10gms on some of the old Steinway's 
that have the graphite/wax combination in the spring slots. Cleaning also 
improves the up touch weight, giving a much faster feel to the action.
Remember the force of the spring is divided.  If the jack seems slow, it's 
a good bet that you have a bent pin or tight centre.
I no longer bend Jack centre pins. To centre the jack in the 
mortice.  Twist the Balancier post and put on a dab of CA glue, around the 
joint where it is glued to the lower arm, works for me.   The primary 
reason for jacks not centered is warping of the post, and not the centre 
pin as most people believe.  Start checking the alignment of the balancier 
and the bottom wippen arm and you will know what I mean.

I know , too much imformation. <G>

Regards Roger


At 12:32 PM 10/22/02 +0200, you wrote:

>So who will give us a good explanation on why this grease is used yet
>originally.
>
>Is my idea correct (evening of springs/touch, allowing a stronger
>spring toward jack) ?
>
>Isaac OLEG
>
>
>
> > -----Message d'origine-----
> > De : pianotech-bounces@ptg.org
> > [mailto:pianotech-bounces@ptg.org]De la
> > part de David Andersen
> > Envoye : mardi 22 octobre 2002 10:18
> > A : Pianotech
> > Objet : RE: Spring behavior
> >
> >
> > >One of the first things I do on a complete
> > >>regulation is flip the stack and clean out the grooves.
> > Absolutely.  Makes a big difference.
> >
> > David
> > A.
> > _______________________________________________
> > pianotech list info: https://www.moypiano.com/resources/#archives
> >
>
>_______________________________________________
>pianotech list info: https://www.moypiano.com/resources/#archives