Tight bushings

[David M. Porritt]

---------------------- multipart/alternative attachment
Yes, these have the dreaded graphite on them.  I can't see any
scoring, but my eyes aren't what they once were and I don't have a
microscope at the shop.

dave
*********** REPLY SEPARATOR ***********

On 6/14/02 at 5:23 PM Baldwin Yamaha Piano Centre wrote:

Hi Dave,
              Something that tight has quite a lot of friction,
friction generates heat,  heat on metal causes expansion.  Does this
set of shanks have graphited bushing cloth? Examine the pins
carefully for score lines.
Just a random thought.
Roger

At 05:47 PM 6/14/02 -0500, you wrote:

OK all you engineer types.  I was repining some hammer flanges today
on a Steinway that has been in a practice room.  Action parts are
Renner.  It gets hard play 14+ hours a day.  The action was rebuilt 4
years ago.  Nearly all of the bushings were quite tight -- most 1 or
2 swings.  A few had 3 swings and I was pinning for 4 so since the
action had been in the shop (idle) for a couple of weeks, I thought
maybe I could just vigorously work the shank a few seconds and it
would swing 4.  I'd hold the flange and make the hammer swing back
and forth fairly forcefully for 5 or 6 seconds and then test it
again.  In each case the ones that previously would give 3 good
swings, now only gave 1.  The hammer dropped from horizontal to
vertical and stopped dead.  
 
What made the bushings get tighter by simply working the flange?  I'm
stumped!
 
dave


_____________________________
David M. Porritt
dporritt@mail.smu.edu
Meadows School of the Arts
Southern Methodist University
Dallas, TX 75275
_____________________________
Roger
_____________________________
David M. Porritt
dporritt@mail.smu.edu
Meadows School of the Arts
Southern Methodist University
Dallas, TX 75275
_____________________________


---------------------- multipart/alternative attachment
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/caut.php/attachments/86/c6/3d/0e/attachment.htm

---------------------- multipart/alternative attachment--