Balance pin holes

[David ilvedson]

The Yamaha tool is shaped like > except rounded at the end, 
not pointed.  It naturally gives the mortice up from the balance 
hole that shape while easing.  I have massaged the wood on 
the bottom to close the hole if too big.  Just the wood directly 
in the middle of key on the fore and aft of the hole, not the 
sides which would affect key height.  

David I.

Date sent:      	Thu, 24 Feb 2000 10:33:04 +010
From:           	Richard Brekne <richardb@c2i.net>
To:             	pianotech@ptg.org
Subject:        	Re: Balance pin holes
Send reply to:  	pianotech@ptg.org

> 
> Thanks Roger
> 
> nice complete posting for my collection. What a guy... grin. I wonder if you could
> get into this about the balance pin hole a bit more tho. Leave the key bushings
> out of the discussion for the moment. The hole is like supposed to be just about
> the same size as the pin from the bottom of the key upwards inside the key... just
> how far ?? what happens if this distance is too small / to large. How do you
> change this distance (grin and at the same time improve the situation..) ??
> 
> Also I seem to remember Laroy Edwards describing the Yamaha tool as you do,, but
> then he also had some adjustment he made with this from the bottom of the key...
> Cant remember what he said.. anybody ??
> 
> 
> 
> Roger Jolly wrote:
> 
> > Hi Richard,
> >                 A couple of suggestions.
> >
> > Easing should always be done from the top of the key with a Yamaha style
> > bushing hole reamer.
> > The easing should be be done by rotating the tool with little or no
> > downward pressure. A little at a time
> > is the key, ( no pun intended <g>) the key should just slowly slide down
> > the pin.
> > Before reaming check the balance rail bushing to make sure this is not
> > causing the problem. 0.002" is the desired clearance for balance rail
> > bushings......
> >
> 
> --
> Richard Brekne
> Associate PTG, N.P.T.F.
> Bergen, Norway
> 
> 
> 


David Ilvedson, RPT
Pacifica, CA
ilvey@jps.net