[CAUT] Re: was re:magnets etc,now Tokiwa parts

[Overs Pianos]

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Hi all,

>----- Original Message -----
>From: <mailto:solliday@ptd.net>Chris Solliday
>To: <mailto:mark@nhpianos.com>Mark Dierauf
>Sent: Thursday, March 31, 2005 10:09 AM
>Subject: Re: [CAUT] Re: Leads, Magnets, Springs, etc.
>
>Mark, I don't know what vintage those parts were, but the centers in 
>Tokiwa parts were recently redesigned by someone from Yamaha, and 
>you'd have to ask Randy Morton or Bob Marinelli who, and exactly 
>when, but my own experience has been no problem since. Although I 
>must say I never had the degree of problems you are describing. Over 
>the years I have had similar problems with Tokiwa,

Tokiwa are manufacturing the wippens and shanks & flanges for our 
Overs grand action. We experienced the dreaded seizing problem with 
the first three actions Tokiwa built for us (piano no. 3 in 2001 was 
our last instrument to be fitted with the problem centers before the 
fix - while some of you were sleeping overnight at the Reno 
convention, I was on occasion down at the piano recentering the odd 
hammer center). However, after some discussion of the problem with 
Tokiwa, they are now making our action using Renner bushing cloth. We 
haven't had one problem center since that time.

>Steinway factory, Abel, Renner, and even on a rare occasion long ago 
>Yamaha factory not to mention many minor name manufacturers. The 
>culprit almost always is a bad run of bushing cloth although it can 
>combine with improperly dried wood so that the hole itself is moving 
>which I have had with Abel on occasion.

The problem can also occur with good bushing cloth. It is important, 
when making the parts, to ensure that sufficient time is allowed 
after installing the bush for the cloth/flange glue to thoroughly dry 
before dipping the parts to swell the bush. If the parts are dipped 
to early, the glue can migrate through the bushing to the centre 
pin/bushing contact area. This can allow the glue to deposit on the 
pin which will ultimately result in the galling which many of us have 
experienced.

When we had problems with the aforementioned galling in our earlier 
actions, I raised the issue of allowing time between bushing and 
dipping with Tokiwa. I don't know exactly what changes were made to 
the production process apart from the use of Renner cloth, but no 
parts have galled for us since the 2002 fix.

Ron O.
-- 
OVERS PIANOS - SYDNEY
    Grand Piano Manufacturers
_______________________

Web http://overspianos.com.au
mailto:ron@overspianos.com.au
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