No Power Yamaha revisited

[Richard Brekne]

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Thanks muchly Roger...

seems to be the description that makes the most sense so far. Very roughly
then, adjust the glide bolts so that they all are in contact with the bed, AND
all lift the balance rail to the point that the Front Rail is just a nats butt
away from being lifted as well...

Key height and the rest is set afterwards.

Correcto ?


Roger Jolly wrote:

> Hi Avery & Ric,
>                           I have a good minds eye view, of what is going
> on, but I'm not so sure I can explain it well.   But here goes.  (Send me a
> deluxe flame suit Conrad).
>
> If you have the bolts just touching, there is no compression force acting
> on the balance rail.  With rapid forceful playing, there is a small amount
> of bounce taking place at the balance rail, robbing the action of a lot of
> energy.  It gets dissipated within the frame.
> Jack the bolts a little further down,  you start to bow the cross
> struts.  and putting some compression into the rail. , and firmly seating
> it to the bed.   At the Yamaha Technical Academy, they spend a good deal of
> time teaching you how to tune these rails in aurally.  takes more than a
> little practice to get optimum results.
> The front rail is done first, by tapping on the front rail with a kind of
> 45 degree blow, to the leading edge of the rail.  (You can hear better than
> the traditional method of holding a key down and thumping on the key, the
> front rail punching absorbs a lot of noise,) Then the bolts are adjusted so
> the front rail just starts to lift, then back off about 1/4 turn.  Next
> step is get all the glides bedded so the tone is the same when lifting up
> on the hammer rail, and thumping down on the balance rail.
>
> The closest analogy I can think of,  is like string bearing across the
> bridge.  Too much bearing and a loss of tone, too little loss of tone.
>
> Now I will crawl under my rock and smile.
>
> Regards Roger
>
>

Cheers
RicB

--
Richard Brekne
RPT, N.P.T.F.
UiB, Bergen, Norway
mailto:rbrekne@broadpark.no
http://home.broadpark.no/~rbrekne/ricmain.html
http://www.hf.uib.no/grieg/personer/cv_RB.html


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