Compression ridges and hide glue.

[gordon stelter]

Not talking about edge joints. Talking about rib to
board joint which, if creep occured, would allow the
downbearing pressure to increase compression 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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