[pianotech] FW: castor for piano

[John Ross]

That almost looks like what happens when someone installs a set of  Darnell 
replacement casters improperly.
I just replaced a set, that had been replaced on a Yamaha U1.
The wooden caster bushings were too small to fill the cavity, so they gave 
no support to the caster socket. It then 'wobbled', and broke the sleeve on 
the socket. The wheel, then wobbled and got chewed up, making score marks 
where the caster frame rubbed on the wood.
The proper fix would have been to make larger wooden bushings that filled 
the hole. But I wasn't at my shop.
I took some gasket material, inserted it in the cavity, around the socket 
sleeve. It was tight, needing to be hammered in. The socket was then tight. 
I screwed it in putting some caster washers I had made from hardboard, 
rather than the cardboard ones you can buy.
This brings the wheel above the surface so that the caster frame doesn't 
bind.
This raises the piano a bit, but the alternative is to route out the wood to 
allow free rotation.
Some people us plate casters, but I find that it raises the pedals too far 
off the floor.
John Ross
Windsor, Nova Scotia
----- Original Message ----- 
From: "David Ilvedson" <ilvey at sbcglobal.net>
To: <pianotech at ptg.org>
Sent: Tuesday, April 27, 2010 5:27 PM
Subject: [pianotech] FW: castor for piano








Hey List,

This a Kohler and Campbell studio.   The sleeve thingy is broke...is Kohler 
& Campbell still around?


David Ilvedson













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