compression ridges and hide glue/Ron N.

[gordon stelter]

Sorry Ron, 
    But hide glue DOES creep, as I have seen it do in
many pianos with "veneer creep" ( under much less
stress than board/rib glue lines!!! ), and on bellows.
Visit your local piano hoarder and pull the panels on
some old "Standard" players. I believe that you will
see where the cloth on the reservoirs has sloooowly
moved on the wood, under the force of the equalizer
spring.
      So it seems to me that a rib impervious to
longitudinal hygroscopic deformation, combined with an
utterly waterproof glue line at the rib/board
interface could significantly reduce compression
ridges and board failure.
     Thump

--- Ron Nossaman <RNossaman@cox.net> wrote:
> 
> >TSK! TSK! Ron! I certainly hope you are kidding!
> 
> Not altogether.
> 
> 
> >After 72 hours, hide glue
> >has lost 50% of it's holding power!
> 
> Which for general refelting, damper or pneumatic
> work, is still many times 
> the strength needed for the job. I typically use
> fresh glue hanging 
> hammers, but I have used old glue/new glue mix with
> no apparent problem. 
> Maybe another 25 years will tell me different, or
> all the hammers installed 
> with reheated glue have fallen off and nobody told
> me. That's a possibility 
> too. Also, does anyone have the figure for the
> strength degradation of hide 
> glue after the addition of the necessary chemistry
> to make it liquid and 
> storing it on the shelf for six months before it's
> even purchased? I seem 
> to recall (questionable worth) reading it was around
> 50% of hot hide, and 
> people are using it in soundboards.
> 
> 
> >If it stinks, at all, (ie a sour smell),
> >Dump It!
> 
> Of course. And if you leave an unplugged pot covered
> for a few days, that's 
> almost inevitable. Uncovered, it just dries out on
> top without growing 
> things. Reheated, with a bit of new glue and water
> added, it will be quite 
> adequate for most applications.
> 
> 
> >BTW, most of the commercial pots, (usually quart
> size or years ago,
> >a pint size), do not have the thermostat set to the
> proper temperature.
> >Anything over 155-160 is too hot! (I prefer
> 130-140) ALWAYS  use a
> >thermometer for best results.
> >Best Regards,
> >Joe Garrett, RPT, (Oregon)
> 
> Good point. High temperature degrades glue quicker
> than time in the pot.
> 
> Ron N
> 
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