[CAUT] Teflon Bushings

[Brent Fischer]

Del,
    With all due respect, give credit to Steinway. Basically the quotefrom the WNG site on what went wrong. Along with " a hole in woodis circular only at the EMC which it is drilled at."   Therefore,I agree for contact stiffness the hard bushing for the shank flangemakes all the sense , anywhere else in the action, just get rid of itor make teflon beaded necklaces. Brent
--- On Sun, 11/28/10, Delwin D Fandrich <del at fandrichpiano.com> wrote:

From: Delwin D Fandrich <del at fandrichpiano.com>
Subject: Re: [CAUT] Teflon Bushings
To: caut at ptg.org
Date: Sunday, November 28, 2010, 9:54 PM

And those repair procedures were completely wrong for the material. Yet this
technique continued to be taught for several years after it was known and
demonstrated to be inadequate.

Workable techniques did not come into being until they -- along with the
appropriate tools -- were developed independently by piano technicians. Once
we had the appropriate tools and had figured out how to service the things
these actions became increasingly reliable and the benefits of synthetic
bushings began to be realized. Of course, by then the damage was done and
another fundamentally good idea had bitten the dust.

ddf

Delwin D Fandrich
Piano Design & Fabrication
620 South Tower Avenue
Centralia, Washington 98531 USA
del at fandrichpiano.com
ddfandrich at gmail.com
Phone  360.736.7563

-----Original Message-----
From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Horace
Greeley
Sent: Sunday, November 28, 2010 7:40 PM
To: caut at ptg.org
Subject: Re: [CAUT] Teflon Bushings

... Perhaps more importantly, the solid-bushed Teflon action was a number of
years into production before any procedures for servicing it was available,
let alone tools with which to perform the service.  It wasn't until things
were largely at crisis level that Freddie Drasche started teaching his
home-grown technique of rolling brass center pins between two files....

Too bad...still an excellent concept...once fully worked through, it's very
stable and will last a long time.

Best.

Horace




      
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