Teflon bushings: (was Re: Pinning on new flanges}

[Rod Fudge]

Thank you.
----- Original Message ----- 
From: "gordon stelter" <lclgcnp@yahoo.com>
To: "Pianotech" <pianotech@ptg.org>
Sent: Thursday, August 26, 2004 8:56 AM
Subject: Re: Teflon bushings: (was Re: Pinning on new flanges}


> So, would Teflon powder in a naptha carrier, as I used
> on those knuckles, be a good idea? Or would it clash
> with CLP's, etc..
>      Thump
> 
> 
> --- Richard Brekne <Richard.Brekne@grieg.uib.no>
> wrote:
> 
> > This is one of the big reasons I lean towards the
> > idea of using teflon 
> > powder in felt bushings.  Seems to me the best of
> > both worlds. You can 
> > actually increase the degree of firmness around the
> > center pin whilst 
> > maintaining whatever friction levels you feel are
> > best. All the while 
> > maintaining the positive characteristics that felt
> > bushings have.
> > 
> > RicB
> > 
> > Don Mannino wrote:
> > 
> > > At 07:10 PM 8/25/2004, you wrote:
> > >
> > >> I was under the impression that one of the
> > problems with teflon was 
> > >> wood swelling and squeezing the bushing thus
> > tightening the flange... 
> > >> is this another urban legend?
> > >>
> > >> David I.
> > >
> > >
> > > David, I believe this was true for the first
> > generation Teflon 
> > > bushings.  Later the flanges were modified with
> > ribs on the outside, 
> > > which seems to have pretty well eliminated the
> > wood / bushing 
> > > interface issue.
> > >
> > > Another factor which has not been mention clearly
> > is that Teflon is 
> > > not a very resilient material.  This was alluded
> > to when someone 
> > > mentioned earlier that the bushings are sometimes
> > damaged by a 
> > > technician filing the hammers.  Wool cloth can be
> > pounded with a 
> > > hammer repeatedly with little ill effect, but
> > Teflon will generally 
> > > dent (or "bruise," as Ed McMorrow put it).  In
> > some high use 
> > > situations, especially combined with poor fitting
> > procedures, the 
> > > bushings will tend to develop clicks because the
> > Teflon is deforming 
> > > under the impact of playing and tuning the piano.
> > >
> > > Don Mannino RPT
> > >
> > >
> > >
> > > _______________________________________________
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> > >
> > 
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> > 
> 
> 
> 
> 
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