Fw: Fw: hammer replacement

[Erwinpiano]

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 Wiw
   The information I referred to in my previous post of calculating bore =
distance is very common information these days and a method for avoiding =
a major ooops in a rebuilding job.
    After 30 years of doing hammer replacement I have had many bad =
outings as you suggest.  Once I did as you prescribed on a old Kimball =
grand and the original bore was so short the shanks over centered by =
more than a 1/4 of an inch!  Factories make a lot of mistakes and so do =
hammer prepper.  I got weary of crappy and to tight  boring which made =
installation difficult.  I realize some are doing that more accurately =
these days but I'll still bore my own.
  Also for example with Stwys and others but Stwys are what I check most =
often the string heights can vary by 2 or three m.m in the tenor treble =
yet Steinway and others will send you a standard bore hammer of 2 =
1/8"bass bore and 113/ 16".  However the tenor sections can be 2 to 3 mm =
higher in the mid tenor than in the treble and can also be sloped one =
way or another.  The bass as well can have similar problems.  Some older =
Stwy B's and D's had bore lengths of 2&3/8" bass and close  to 2 " tenor =
treble so if standard bore hammeres were used in this application =
regulation,geometry and touchweight problems would be a big deal to your =
client and your reputation.
  The real question is how accurate do you want your regulation to be?  =
If you install hammers that over strike from the git go you've already  =
undermined one of the many reasons for replacing the old worn out =
hammers in the first place which is regulation , geometry and touoch =
weight do to over centering.
   In uprights this is less critical and original bore intentions less =
easy to measure. Usually my rule o f tumb is to observe the bore lengths =
of not 1 and 88.  Note one will always be close to original and note 88 =
can be determined by adding 3mm  above the wood molding.



----- Original Message -----=20
From: Wimblees@AOL.COM=20
To: pianotech@ptg.org=20
Sent: Thursday, June 28, 2001 7:25 AM
Subject: Re: Fw: hammer replacement


In a message dated 6/28/01 12:03:58 AM Central Daylight Time,=20
Erwinpiano@email.msn.com writes:=20



  It's o.k. to send them hammers and shanks for angles maybe but  string =

  heights and center pin heights vary as do the accuracy of the original =

  boring. Measure the center pin height from then  Measure string height =
in=20
  each section.Subtract center pin height from string height and it' =
that=20
  simple and no disapointments later. Ding it the other way is a good =
way to=20
  possibly compound errors and end up with a mess that won't regulate!  =
Take=20
  measurements.=20

  =20


Dale=20

I have replaced hundreds of sets of hammers in my 25 years of =
rebuilding, and=20
I have never sent Schaff, or Renner, or any other hammer making company, =
the=20
measurements you state, and I have never had a problem. Furthermore, I =
have=20
never heard anyone mention at a seminar or convention that these =
measurements=20
need to be sent in order to duplicate a set of hammers. Apparently you =
must=20
have had a bad experience once, and therefore assume that this is the =
only=20
way to order a set of hammers.=20

I would like to hear others with similar experiences. Have I been lucky =
for=20
25 years, or is Dale sending information that is not necessary?=20

Willem=20


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