Yamaha hammers

[Erwinspiano@aol.com]

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In a message dated 11/6/2003 3:08:06 AM Pacific Standard Time, 
davner@kaosol.net writes:
    Is that indeed what's happening in a hammer with lots of tension -- like 
bending a rope sharply, then hacking at the top of the bend with a knife, 
gradually cutting the fibers and making it pull apart?  
    --David Nereson, RPT

   Hi Dave
   Having sliced & diced many Hammers looking for tension I've never found 
Yamaha hammers to have any. If there was tension, meaning that the felt was 
stretched around the molding during pressing the when you cut the felt open it 
should blossom like a flower opening. Does that make sense? To me it does.
     I used to do this routinely when Bob Davis & I were teaching a voicing 
class. We'd cut the felt open from the top thru the strike point & on most 
hammers virtually nothing happened. zip. You could super glue the felt back 
together & put it back in the piano. kidding.
    The other way to demo this is to cut them open is on the band saw. Cut up 
thru the molding with the blade cutting up under the strike point. If there 
is tension the hammers should spring apart. I've seen 2 hammers demonstrate 
tension. The most active one is  The Ronsen & the other the Isaac Hammer
 Nutones had a little bit & every thing else was zip. Try it.
  So I don't know why the Yam hammers are tearing apart but it's not tension.
  Perhaps its the wool being weakened by over bleaching or processing.
  Dale

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