Touch weight

[Richard Brekne]

I would agree with your conclusions 100 % David. I am curious tho as to whether
you've begun to play around with the idea of trading FWs for key inertia yet.
And for that matter...how do you distribute the lead you use to achieve any
given front weight, and what are your reasonings for whatever decisions you
have.

At the moment, I am going for distributing leads about the midpoint between the
balance rail and key front... tho a few I know mean that its better to move
that out a bit... say 2/3'ds the distance...tho they have been unable to really
say why. We do know that we get less key inertia for same FW the closer we
concentrate mass towards the middle. Course there is no doubt a practical limit
there... but just so.

At any rate.. I would be pleased to hear your thoughts on why you place leads
where you do.

Cheers
RicB

David Love wrote:

> It's simply a guideline.  The maximum also does not suggest that inertia
> problems suddenly begin once you exceed the maximum.    Adding weight adds
> progressively more inertia until at some point it becomes objectionable.
> That subjective line will vary.  As is usually the case, it's a bell shaped
> curve.   I personally prefer a maximum a bit lower than this; around 80% of
> the published maximum, and I am content with a correspondingly lighter
> strike weight or hammer.  Matching the exact curve is not that important as
> long as it's a smooth curve.  Encroaching on or exceeding the maximum is
> less of a problem at the top of the action where there is less mass in the
> hammer and, therefore, less overall lead in the key, than at the bottom.
>
> David Love
> davidlovepianos@earthlink.net
>
> > There is no where any real documentation that I am aware of that
> justifies any
> > precise assumptions about Maximum FWs. Indeed... I would think that given
> the
> > variance possible in key inertia for same FW... such a table would be in
> the
> > end less then usefull to begin with.  In anycase... todays maximum table
> is to
> > no small degree a subjective opinion... which means any assumptions about
> what
> > SW is appropriate for any given SWRatio is also equally subjective.
> >
> > That being said... there is also a good deal of experience and data that
> lies
> > behind that subjective opinion.... so untill we get further with figuring
> in
> > Key inertia into this picture.... its a good reference table.
> >
> > 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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--
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