teflon flange & bushing??$$$

[pianolover 88]

I don't really mind the way things are; a good % of my income comes from 
freeing sluggish actions in the shop, in addition to lots of hammer 
filing/reshaping jobs!


Terry Peterson




----Original Message Follows----
From: Ron Nossaman <RNossaman@cox.net>
Reply-To: Pianotech <pianotech@ptg.org>
To: fordpiano@earthlink.net, Pianotech <pianotech@ptg.org>
Subject: Re: teflon flange & bushing??
Date: Sun, 15 Dec 2002 18:48:43 -0600


>  I might be reluctant to use plastics in a piano that was meant to last a
>long time since I don't believe there is yet a track record for longevity 
>with
>the plastics available now.

Kawai has been torture testing ABS flanges for nearly 30 years. The first 
ones installed still test stronger than new wood. I'd guess it was probably 
fairly safe by now, since pianos don't last longer than that anyway... 
right?


>         In regard to the question of teflon flanges with teflon bushings - 
>if you're
>making the flange out of teflon why do you even need a bushing?  Just drill 
>or
>ream the hole to the proper size for the pin.  This would seem to speed 
>things
>up in the assembly process.

Teflon is too soft to work as a flange, and when a ham handed field tech 
butchered one, the whole flange would have to be replaced - and they'd be 
slippery and hard to handle. <G>


>I'm surprised some manufacturer hasn't thought of this already
>(maybe they have and I don't know about it).

They did, but decided against. Didn't you get the call?


>As to the comment that all wood parts would have to be made of ABS (or 
>other
>plastic), why?  Why can't you mix?  Some parts could be plastic and some 
>parts
>wood, as seems appropriate.

You can. It's done, and it seems quite appropriate. Shanks are still wood, 
even if the rest of the action is ABS.


>         About the Kawai actions with ABS parts?  I have not seen one of 
>these yet.
>What sort of bushings do these use?

Bushing cloth, like wood ones (only less trouble). They're very nice 
actions.

Ron N

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