Compression ridges and hide glue.

[gordon stelter]

I'm not talking about the edge joints. I'm referring
to the rib to board joint which, if it were to slide
even minutely under the bearing load and with humidity
variations, WOULD increase comp. ridging.
    Thump

--- Farrell <mfarrel2@tampabay.rr.com> wrote:
> Any idea what might explain your observation? I
> don't see how the glue used on an edge joint could
> affect the development of panel ridges - be it
> Titebond, cold/hot hide glue, epoxy, or whatever.
> 
> Terry Farrell
> 
> ----- Original Message ----- 
[link redacted at request of site owner - Jul 25, 2015]
> To: "Pianotech" <pianotech@ptg.org>
> Sent: Sunday, September 28, 2003 9:20 PM
> Subject: Re: Compression ridges and hide glue.
> 
> 
> > gordon stelter wrote:
> > > I was wondering today if glue-line creep could
> be
> > > considered a significant factor in the ( alleged
> )
> > > self-destruction of compression-crowned boards?
> After
> > > all, hide glue becomes fairly gelatinous in all
> but
> > > very low humidity, so this, combined with the
> glue
> > > line stress in CC boards could lead to premature
> > > failure, and increased compression-ridging.
> > >      But this may be much less of a  problem
> with
> > > modern glue types.
> > >     Right?
> > >     Thump
> > 
> > 
> > Well Thump,
> > 
> > I think you have this completely backward. Hide
> glue is the best glue 
> > for panel edge joints. I had problems with pre
> made panels in the dark 
> > past. They were glued with the other alternatives
> (probably Tightbond) 
> > and I would have seasonal ridges at the joints.
> When I made my own 
> > panels I used hide glue and never had the problem
> again. I have been 
> > making my own panels ever since. Piano rebuilding
> is like baking; for 
> > the best results make you own pie crust. And the
> old way with real 
> > butter taste a lot better the Crisco.
> > 
> > I size the edges with thin hide glue the day
> before the glue up. Check 
> > out the photo here:
> > 
> >
>
[link redacted at request of site owner - Jul 25, 2015]
> > 
> > John Hartman RPT
> > 
> > John Hartman Pianos
[link redacted at request of site owner - Jul 25, 2015]
> > Rebuilding Steinway and Mason & Hamlin
> > Grand Pianos Since 1979
> > 
> > Piano Technicians Journal
> > Journal Illustrator/Contributing Editor
[link redacted at request of site owner - Jul 25, 2015]
> > 
> > 
> > _______________________________________________
> > pianotech list info:
> https://www.moypiano.com/resources/#archives
> > 


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