Hammer boring fit was: Re: TOOLS/Hide Glue, etc

[Farrell]

I always thought that with wood glue AND with hide glue, a well-fitting joint is important, and that hide glue does NOT have good gap filling properties. No?

Terry Farrell
  
----- Original Message ----- 
From: "David Love" <davidlovepianos@earthlink.net>
To: <pianotech@ptg.org>
Sent: Tuesday, May 14, 2002 1:43 AM
Subject: Hammer boring fit was: Re: TOOLS/Hide Glue, etc


> Depends on how wobbly.  Too loose isn't good, but I like some movement so
> that I can adjust angles slightly to smooth out the fanning and square up
> hammers when boring isn't perfect.  If you use hot hide glue it has
> excellent gap filling properties and will form a nice collar that takes up
> the slack well.  With thinner wood glues a better fit is more important.
> 
> David Love
> 
> ----- Original Message -----
> From: "Greg Torres" <Tunapiana440@cox.ne t>
> To: <pianotech@ptg.org>
> Sent: May 13, 2002 6:39 PM
> Subject: Re: TOOLS/Hide Glue, etc/Isaac Oleg's post
> 
> 
> > THIS was my main gripe on my previous 'rant' about the Steinway
> > hammers/parts/...
> > I also like a hammer bore that is a fairly snug fit. It should never be so
> > loose as for hammers to wobble. And for Steinway part's dept. to say that
> is
> > normal just blows my mind...
> >
> > Best,
> > Greg Torres
> >
> >
> > ----- Original Message -----
> > From: "John Delacour" <JD@Pianomaker.co.uk>
> > To: <pianotech@ptg.org>
> > Sent: Monday, May 13, 2002 7:12 PM
> > Subject: RE: TOOLS/Hide Glue, etc/Isaac Oleg's post
> >
> >
> > > What is a standard hole?  The hammers should be bored so that they are a
> > very tight fit on the shank before knurling.  The shank should then be
> > rolled through the knurling machine to reduce the diameter so that the
> > hammer can be turned without creaking for about 20 seconds after gluing.
> > After that it should become too tight as the moisture from the glue
> > re-expands the compressed shank.  The hammer should never at any stage
> have
> > any wobble, let alone 'fall'!  If the hammers are carefully bored, hammer
> > fitting is straightforward provided you follow the proper procedures.  To
> > have to rely on "wobble" for fore-and-aft positioning is a sign that the
> > hammer heads have not been bored properly -- and there is at least one
> > well-known German hammer maker whose speed exceeds his exactness.  I
> always
> > bore my own and save myself a lot of trouble.
> > >
> > > JD
> > >
> > >
> > >
> > >
> >
> >
> 
>