Grand hammer tail shape.

[David Ilvedson]

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Doug,

If you haven't checked out Bill Spurlock's Tools yet, do it now.  He is in
the Journal.

David I.
-----Original Message-----
From: owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]On Behalf Of
Doug Mahard
Sent: Friday, April 14, 2000 7:07 PM
To: pianotech@ptg.org
Subject: Re: Grand hammer tail shape.


Thanks for the replys everyone.  Newton and Jon honed in on the info I was
seeking.  My post was perhaps a little vague but I was looking for info on
the side cut (tapering) not the tail arcing, but that was interesting
reading too.

Roger, steamed my first set of hammers the other day on a Young Chang.
Saved me a lot of filing and the tone mellowed out real nice just like this
particular customer likes.  Can't wait to try it again.

Doug Mahard
  ----- Original Message -----
  From: Roger Jolly
  To: pianotech@ptg.org
  Sent: Friday, April 14, 2000 3:05 PM
  Subject: Re: Grand hammer tail shape.



  Hi Doug,
               the tailing on the Korean piano you are talking about should
be 2 1/2" to 3" radius from the hammer shank to the bottom of the tail. The
tailing should also be at 90 degrees to the shank, and not the 15 degrees
off set that you will find from the factory.
  Correct tailing will give better checking and reduce the wear on the
flange centres.  Having the tail square with the hammer rail, will help to
trap the tail into check, the angle that is there from the factory is
actualy self defeating, as it want's to push the hammer out of check.
  If any checkering is required it should only be quite light.
  After tailing you will have to realign the face of the checks plus reset
the rake and distance, with care you can get these pianos to check at 1/2"
in the bass on a ppp blow.
  The touch will also improve as this will remove almost 1 gm of mass,
netting you about 5 gms of down weight.
  We taper and tail 100% of our Wurlitzer products with this problem.
  Regards roger


  At 07:42 AM 14/04/00 -0400, you wrote:
  >Hi one and all,
  >
  >What are the criteria used in determining grand hammer tail taper shape.
Is
  >it factors of clearence with neighboring parts and weight reduction?  As
  >most of you know, the Korean pianos come through with none of this done,
  >just the tail arcing and some very rough ridges for checking purposes
that
  >always seem to tear up the backchecks prematurely.
  >
  >Thanks and a good weekend to all.
  >
  >Doug Mahard
  >

  Roger Jolly
  Saskatoon, Canada.
  306-665-0213
  Fax 652-0505

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