[CAUT] unmusical caster noise

[Don Mannino]

Jim,
 
Sometimes those big German casters rock a little when locked in the
front - I have heard that noise before, but not from the un-locked
caster.  The locking casters tend to wear a bit, and acquire a little
knocking free play when locked down.
 
You might try a little spray grease on the caster axle, to see if you
are getting noise from an unlubricated shaft.  Start up friction could
be at fault, with a little rocking of the piano making a noise.  I
haven't experienced this, though, so it's just a guess.
 
Kawai puts the locking casters on the front to give the most solid basis
for the player.  If either of the front legs have a little wiggle in
them, then this can take a small amount of power out of the tone.
Similar argument as for tonal loss from a spider dolly.
 
Don Mannino

  _____  

From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of
Jim Busby
Sent: Tuesday, December 04, 2007 7:51 PM
To: College and University Technicians
Subject: [CAUT] unmusical caster noise



All,

 

The rear concert caster on one of our Ds "knocks" and I can't seem to
find the "fix". If we orient it 90 degrees to the player it doesn't
knock, but if the stage crew forgets and it is in line with the player
it will knock with vigorous playing. (Fairly loudly, like someone
tapping their foot.) The leg seems to be tight. It is the actual wheel.
It is the big expensive brass kind, but unfortunately not Jurgen's. Any
simple fix?

 

The front castors lock (and have no problem) but the rear doesn't. I
can't see how/where/why it is knocking, but it surely does.

 

Thanks.

Jim Busby BYU

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