Compression ridges and hide glue.

[gordon stelter]

Well, with all the boards I have seen coming apart at
the hide glue joints, I remain skeptical. ( You live
in Aridzona? )
     And I was actually referring to the rib to board
glue line, wondering if it would creep in higher
humidities, due to the downward pressure of strings,
especially on CC boards with increased lateral
stresses at this juncture.
     Schlump

[link redacted at request of site owner - Jul 25, 2015]
> 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]
> 
> 
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