Two action questions

[Jim Coleman, Sr.]

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
> 
>