Tight bushings

[Baldwin Yamaha Piano Centre]

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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

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