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

[gordon stelter]

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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> >
> 
> _______________________________________________
> pianotech list info:
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> 



		
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