Isn't the best reason for plastic the fact you can mill it precisely and especially drill it without the drill bit wandering? I still haven't had any real problems with plastic except glue impregnated bushing cloth which isn't the plastics fault unless wood absorbed some of the glue? David I. ----- Original Message ----- From: "Richard Brekne" <Richard.Brekne@grieg.uib.no> To: "Pianotech" <pianotech@ptg.org> Sent: Wednesday, August 25, 2004 2:59 AM Subject: Re: Pinning on new flanges > Don Mannino wrote: > >> >>> >>> Interestingly enough, it is the position of the Yamaha factory that >>> wooden flanges with felt bushings remain quite stable with regards to >>> tightness as (they say) the reactions of the wood holes, and felt >>> bushings are very close to exactly opposite to climatic changes. Indeed >>> they argue against Kawaiis (and others) use of plastic flanges very >>> much on this basis. >> >> >> This is a common salesperson's story, but it is not borne out under >> actual testing. Feel free to try it some time. The wood hole does not >> enlarge evenly (it can become oval), and the change in the felt is many, >> many times more than the small change in the wood. > > Well Don... I dont claim to have done any formal studies myself.... but > upon directly asking some folks in the <<know>> at Hamamatsu whether or > not they actually had tested this... the answer was a very firm yes. They > said... if we hadnt tested, we would have no basis for not using plastic > parts. > > So... grin.. you guys fight it out.. personally, I have no real experience > with the new Kawaii parts so I reserve personal comment on the matter > until I do. I am just reporting things I come across out there in the > world. > > Cheers > RicB > >> >> Yamaha has a nice feature in their grand shanks which also stabilizes the >> bushing hole nicely by cross-laminating veneer on the shank forks. This >> makes the holes almost as stable as plastic :-) Only the surface fiber >> swelling will take place under humid conditions. >> >> Don Mannino RPT >> >> >> >> >> >> _______________________________________________ >> pianotech list info: https://www.moypiano.com/resources/#archives >> > > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives
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