[CAUT] Caster noise - solved! 3 noises.

[Jim Busby]

Don,

That explains it. The threads were messed up. The "lock ring" (thanks) tightened up well but some CA is a good idea.

Thanks,
Jim

________________________________
From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Don Mannino
Sent: Tuesday, February 05, 2008 3:24 PM
To: College and University Technicians
Subject: Re: [CAUT] Caster noise - solved! 3 noises.

Jim,

Thanks for the report.

The lock ring problem (ferrel?) is one that comes up - as the piano is rolled around, over time this ring seems to spin down and cause wobbling as you found, which makes noise and could cause the caster to come loose or jam.  A few drops of thin C/A glue on the threads should stop this from happening, if you can get them in there.

The locking handle problem comes from people trying to unscrew the handle too far.  I've never understood why people do this - the handle should be snugged down to set the brake, and loosened to release the break.  But some people turn the screw all the way out, then keep turning it out, and cause the shaft to be forced up too far.  This can also mess up the threads badly at the handle, as the locking hex screw turns on the threads.

I can't remember if these are on the Shigeru Kawai EX.  If so, and they continue to be a problem, let me know.

Don Mannino

________________________________
From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Jim Busby
Sent: Tuesday, February 05, 2008 1:41 PM
To: College and University Technicians
Subject: [CAUT] Caster noise - solved! 3 noises.
List,

I finally had time to take apart the big casters and find the problem. Many of you had a part of the puzzle, which actually had 3 noises and not just one.


 1.  The ferrel was loose and needed to be tightened. It definitely clicked there, but after tightening there was still more noise. (see pic)
 2.  The shaft clicked and grease solved that. (It was a small but definite noise. Pic)
 3.  The main noise was the actual handle/shaft that needed tightening. To do this I had to loosening the two small hex nuts on the handle slightly then turn the handle clockwise (tighten) about 180 degrees. You must hold the back (small nub) of this shaft with pliers or it will turn. This brought everything tighter and voila! No noise anywhere. Perfect function.

The pictures show all the important stuff. The last picture shows the space (lost motion) that needed to be removed. That is where the pen is pointing. It took a few minutes to discover this procedure, but it worked well. Too many turns and the wheel won't turn, too loose - noise.

I hope this helps someone else. Thanks to all who gave all the clues and tips.

Jim Busby BYU
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