June Journal and FW's

[David Love]

HW is hammer weight.  I was just referring to how heavy I tend to like the
hammers.  The actual number used for calculation is Strike weight which is a
combination of hammer weight plus shank strike weight.

I meant to say that Renner is making an assist spring wippen with an
adjusting screw for tension just like the one that Tokiwa currently makes
and is available from a variety of sources.  Renner's turbo wippen must be
adjusted by bending the spring.

David Love


----- Original Message -----
From: "Farrell" <mfarrel2@tampabay.rr.com>
To: <pianotech@ptg.org>
Sent: May 30, 2002 5:26 PM
Subject: Re: June Journal and FW's


> "That would tend to put HW's in the medium range in order to keep leading
well under maximums without compromising the SBR (5.75 is my ideal)."
>
> What is a HW? (Or was that supposed to be FW?)
>
> "I will also be glad when Renner starts producing their own WAS wippen,
which, I understand, is coming soon."
>
> Renner has been making their "Turbo Wippen" WAS for some years now. Or are
you speaking of something different? Who makes the WAS that Pianotek now
offers?
>
> Terry Farrell
>
> ----- Original Message -----
> From: "David Love" <davidlovepianos@earthlink.net>
> To: <pianotech@ptg.org>
> Sent: Thursday, May 30, 2002 3:31 PM
> Subject: Re: June Journal and FW's
>
>
> >
> > ----- Original Message -----
> > From: "Bill Ballard" <yardbird@pop.vermontel.net>
> > To: <pianotech@ptg.org>
> > Sent: May 30, 2002 8:27 AM
> > Subject: Re: June Journal and FW's
> >
> >
> > > If what you're saying is that when Steinway actions happen to work
> > > out because of a happy combination of SW and KR, that constitutes >a
well
> > designed action, then I'll respectfully disagree. It made be a
> > > well designed action, but the engineer(s) who fail to notice that the
> > > design as issued by R&D dept, is not being consistently installed
> > > haven't done their job well enough
> >
> > Not having seen the initial design specs it's hard to know who to blame.
I
> > gather that it's a complicated problem getting many departments to work
> > together to get things in the same place every time and to do the
necessary
> > retooling/retraining to insure that everybody's on the same page.  If
you
> > don't index the plate, what chance do you have for any consistency.  I
> > suppose you could blame the design engineer for that.  Unfortunately
there
> > is often a gap between design and execution and design engineers don't
> > always get involved in the production.
> >
> > > >In another case, a classic "new hammers old geometry >arrangement"
had
> > the >problem "fixed" by a set of assist springs.  >Here a relatively
heavy
> > hammer (NY Steinway) on an original >dimension knuckle (15.5?) created
an
> > undue
> > >amount of friction in the action which, of course, was unaffected by
the
> > >addition of assist springs.  Although the balance weight was reduced
>by
> > virtue of adding the springs, a 38 BW still resulted in a 56 DW > >and .
I
> > can't really blame the assist springs for high friction.
> >
> >
> > > Why would one blame the WAS for the high friction? The WAS's >upward
> > pressure through the rep lever onto the knuckle might be a >measurable
> > quantity, but would it be any more than the upward >pressure supplied
by
> > the FWs doing the similar counterbalancing? >The source for the
friction is
> > in the combination of the high SWs and >the short knuckle  mounting
> > distance. The friction applies itself at the
> > > knuckle/replever, and at the capstan/heel.
> >
> >
> > Yes, I totally agree with that.  As I said, I wasn't blaming the assist
> > spring for high friction.  I was, in this case, criticizing the use of
the
> > assist spring to fix a problem that lay elsewhere.
> >
> > For me, the happy medium with the assist spring will probably be to use
it
> > purely as a method of mitigating uneven BW due to manufacturing
> > irregularities and allow for smooth FW's and inertia.  That means using
the
> > WAS for very minimal adjustments of the BW, under 5 grams.  That would
tend
> > to put HW's in the medium range in order to keep leading well under
maximums
> > without compromising the SBR (5.75 is my ideal).  I will also be glad
when
> > Renner starts producing their own WAS wippen, which, I understand, is
coming
> > soon.  I am not that thrilled by the Tokiwa parts.
> >
> >
> > ++++Back in my home town we have a chicken festival and an egg festival.
> > Problem is, I can never remember which comes first.++++
> >
> > David Love
> >
>