Wood Specie Insert for Capstan

[David Nereson]

    Sounds like something a factory would do.  And it explains why, probably, I encountered a brand-new Boston studio where the lost motion wouldn't stay put.  I regulated capstans, then proceeded to tune.  After tuning, many notes again had way too much play.  Turns out, on a hard blow, the capstans would just get pushed down into their holes.  The dealer replaced the piano.
    But I can "see" a factory doing that, actually, to save time, if their experience shows that the capstans stay tight in the wood.  
Driving very fine threads into hardwood is  similar to driving tuning pins into the pinblock.  And most capstan screws do have fairly fine machine threads, not wood screw threads.  But if I were replacing capstans, or moving the capstan line, or installing wood inserts, I would drill the holes.
    --David Nereson, RPT
  ----- Original Message ----- 
  From: Greg Newell 
  To: 'David Nereson' ; 'Pianotech List' 
  Sent: Thursday, February 28, 2008 6:18 AM
  Subject: RE: Wood Specie Insert for Capstan


  David,

                  Del once told me that is exactly what is done. I still haven't tried it but I guess it works. I saw it once at a factory and couldn't believe what I was seeing at the time. I think my mind just assumed that the bit contacting the capstan top was spinning and the friction between them caused the capstan to spin also, but not so. They were being pushed in. 

   

  Greg Newell

   


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