Two action questions

[David ilvedson]

You can also apply pressure with that screwdriver and then 
punch the keys and see if the bouncing hammers stops..

David Ilvedson, RPT

Date sent:      	Tue, 31 Aug 1999 18:07:16 -0700 (MST)
From:           	"Jim Coleman, Sr." <pianotoo@imap2.asu.edu>
Subject:        	Re: Two action questions
To:             	Richard Brekne <richardb@c2i.net>
Copies to:      	PTG <pianotech@ptg.org>
Send reply to:  	pianotech@ptg.org

> Hi Richard:
> 
> On your question #1, when the hammer is at rest, does the knuckle moulding
> point down the back side of the jack or is it at a slight angle to the
> jack? This can make a big difference.
> 
> On your question #2, it looks like the back rail is not bedded properly. You
> can test this with a long narrow screwdriver blade placed down between 
> strings and touching the backrail cloth between two keys. Tap the 
> screwdriver and listen for a knock between the keyframe and the keybed. Even
> though you may have bedded the keyframe properly at first, tightening the
> action bracket screws to the keyframe can sometimes screw this up.
> 
> Jim Coleman, Sr.
> 
> On Tue, 31 Aug 1999, Richard Brekne wrote:
> 
> > Hi list
> > 
> > I got two questions for you all relating to grand actions.
> > 
> > #1.  From time to time I run into a so called quality grand sort (I wont
> > mention the name but it starts with a "P"  grin) that has an odd ball
> > problem regarding regulation. Basically said, unless the jack is
> > regulated waaaayyy back, the note will miss. I ran into this problem on
> > an action I just reworked, I had repacked the nuckles insureing a nice
> > round shape, took much care to regulate the return springs nicely,
> > height of the tip of the jack to repetition lever was set to play it
> > safe (I have had this problem before on other such grands) made sure of
> > basically everything.  Still, upon setting the action in the piano
> > fifteen or twenty notes miss. And try as I may to find a reason, the
> > only thing that seems to help is to set the jacks so that they are well
> > back of the back edge of the core of the knuckle. Jack tips are barely
> > beveled and this is taken into acount. I suspect action geometry..(It is
> > never all that good on these things). Any ideas ???
> > 
> > 
> > #2. Brand new Yamaha C7.  Action is very well bedded, and regulated.
> > Still on hard play in the middle area, 8 or 9 hammers on each side of
> > the note being hit raise (hop) very noticible. Feels like the hammer
> > rail is moving. All screws are dead tight. Lots of power seems to
> > dissapear. Only happens in the middle section of the action..
> > Suggestions ??
> > 
> > Thanks muchly
> > 
> > Richard Brekne
> > I.C.P.T.G.  N.P.T.F.
> > Bergen, Norway
> > 
> > 
> 


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