[CAUT] Down Weight Too High With New Hammers

[William Monroe]

Paul,

To add to the confusion, when I was in NY, Kent Webb said that the black
line was in fact a relic of the mfg. process and did NOT, in fact indicate
directional placement of the bearings.  He further stated that there was no
front/back to the bearings, and you will commonly find some (many) of the
bearings do not have a black line remaining on them.  So...............you
can file that idea back whence it came.  Don't know why it says to place the
line forward in the manual, and neither did Kent.

William R. Monroe



On Wed, Aug 25, 2010 at 8:47 PM, Paul Milesi, RPT <paul at pmpiano.com> wrote:

> Am I to understand that the hole in the half-round is not precisely in the
> center from front to back, and that it is in fact slightly to the back,
> while the bearing is truly "half-round"?  <light bulb moment>
>
> That does explain why they tell you, in the service manual, "The balance
> rail bearing should be positioned with its black line (scribed on the felt)
> towards the front rail."  Having read this, but having never replaced a
> set,
> I never understood what difference it would make.  Clearly the black line
> must indicate something -- I just didn't know what!  I will take a close
> look at the rather worn bearings that are in this piano when I disassemble
> the action again.
>
> Ed, when you say that "what was accelerated was the ratio, in theory," do
> you mean to say that the ratio was increased?  In other words, it might go
> from 1:4.9 up to 1:5 as the key is depressed?
>
> Fascinating.  Thank you so much.  Ever so slowly, I'm putting the pieces
> together, getting an education.
> --
> Paul Milesi, RPT
> Staff Piano Technician
> Howard University Department of Music
> Washington, DC
>
>
> > From: Ron Nossaman <rnossaman at cox.net>
> > Reply-To: <caut at ptg.org>
> > Date: Wed, 25 Aug 2010 18:59:23 -0500
> > To: <caut at ptg.org>
> > Subject: Re: [CAUT] Down Weight Too High With New Hammers
> >
> > On 8/25/2010 6:32 PM, Ed Foote wrote:
> >
> >> It was my understanding that the underlying principle of the
> >> patent was two-fold, to have the leads as close as possible to
> >> the fulcrum, and to have the balance rail pin slightly distal
> >> to the center of the half-round, effectively causing the
> >> fulcrum point to shift proximally as the key rocks. What was
> >> accelerated was the ratio, in theory.
> >> Regards,
> >>
> >> Ed Foote RPT
> >
> >
> > Verifiable by looking at them, the ratio through the key
> > stroke changes far more on a conventional flat punching than
> > it does on the half round.
> >
> > Perhaps it's another suspension of disbelief patent.
> >
> > Ron N
> >
>
>
>
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