Counter-bearing drag

[Frank Emerson]

Actually, I purchase round brass rod from Speedy Metals, on-line, at the
website below.  Select a diameter slightly larger than the finish
half-round height that you desire, allowing for the saw kerf.  I also use
round stock from them to make brass knobs for mass loading bridges.  It's
tricky cutting a half round from a round rod.  If you do not have the tools
for this, a local machine shop can do it for you.

http://www.speedymetals.com/

Frank Emerson


> [Original Message]
> From: John Ross <jrpiano at win.eastlink.ca>
> To: <pianoguru at earthlink.net>; Pianotech List <pianotech at ptg.org>
> Date: 8/3/2007 9:41:50 PM
> Subject: Re: Counter-bearing drag
>
> Where is the half round brass purchased?
> John M. Ross
> Windsor, Nova Scotia, Canada
> jrpiano at win.eastlink.ca
> ----- Original Message ----- 
> From: "Frank Emerson" <pianoguru at earthlink.net>
> To: "Pianotech List" <pianotech at ptg.org>
> Sent: Friday, August 03, 2007 10:13 PM
> Subject: RE: Counter-bearing drag
>
>
> >I have encountered severe cases such as you describe, where no amount of
> > lubrication would relieve the problem.  My solution  was as you
described
> > with a brass half round counterbearing.  However, I would not totally
> > eliminate the felt, but select a thickness of felt that will only
lightly
> > contact the string.  I would also use a narrower width felt.  It doesn't
> > take much to silence this tiny string segment.
> > 
> > Frank Emerson
> > 
> > 
> >> [Original Message]
> >> From: Jon Page <jonpage at comcast.net>
> >> To: <pianotech at ptg.org>
> >> Date: 8/3/2007 9:20:32 AM
> >> Subject: Counter-bearing drag
> >>
> >> There is a S&S locally right on the water, well not really, water 
> >> view/water front.
> >>
> >> There is noticeable and detrimental drag to a section in the high
tenor.
> >> I can move the lever almost '5 minutes' (clock index) before the
tension
> > drops,
> >> conversely on raising. Needless to say, these notes are not stable.
> >>
> >> Short of replacing the wire in that section (complete restringing is 
> >> not in the cards
> >> for this family) could a thin brass strip be placed between the 
> >> strings and counter-
> >> bearing to facilitate the rendering of the strings. If not only a 
> >> small curved segment
> >> at the top edge of the felt.
> >>
> >> I plan to replace the strings on my next visit to their area
> >> but thought this might be an expedient option.
> >>
> >> When restringing, I don't replace the counter-bearing as originally
> > designed
> >> with friction for the entire surface. I limit it to the top edge. My 
> >> next one wil
> >> have simply a half-round or half-oval with non-bearing felt between 
> >> that and the agraffe.
> >> -- 
> >>
> >> Regards,
> >>
> >> Jon Page
> >>
> > 
> >
>