YC Strike Weights etc

[David Love]

I didn't realize you were working at it from that direction.  Of course that
works.

David Love

----- Original Message -----
From: "Richard Brekne" <Richard.Brekne@grieg.uib.no>
To: <pianotech@ptg.org>
Sent: November 03, 2001 1:20 PM
Subject: Re: YC Strike Weights etc


> David Love wrote:
> >
> > Though the assist springs will take care of some problems if you miss,
the
> > FW/SW relationship will not guarantee you a certain BW.
>
> Well of course it wont.. you have to make sure that the WBW
> (KR X WRW) is also to specification.
>
>
> > If you set the FW
> > at maximum and set up your SW's to a corresponding curve without
measuring
> > the BW that  corresponds to that relationship you could end up with a
nice
> > curve and a BW of 50.  I would check to see where the FW maximum (and I
> > would generally not set it at the maximum, it gives no room for
adjustment),
> > puts your BW at a given SW.  Be sure that's what you want.  You can
adjust
> > the SW if it isn't or examine the geometry to see if the knuckle
radius/key
> > ratio is a good match.
>
> If you set FW to maximums, Select and install a SW curve for
> a given overall Ratio and BW specification then you all you
> have to do to make all the bricks fall into the right places
> is insure that the WBW is correct for that specification.
> That means just making sure that your KR times your Whippen
> radius weight ends up being 9.0 grams. When all this is
> done, then whatever uneveness remains is due to friction
> issues, and your BW will be as you specified.
>
> Rewrite the Balance equation... BW = (R * SW) - FW + WBW.
>
> Davids Smart Chart lines SW Curves up against given R's that
> yeild FW Ceiling values for a given BW spec with WBW at 9
> grams.
>
> I have done this on 9 actions so far... and I can assure you
> it works perfectly. It is tho... a bit confining as you are
> limited to what the FW ceiling table allows for in any given
> situation. But it does work out as I have described.
>
>
>
> >
> > David Love
> >
> >
>
>
> --
> Richard Brekne
> RPT, N.P.T.F.
> Bergen, Norway
> mailto:rbrekne@broadpark.no