[pianotech] dowels and glue joints

[Susan Kline]

Hi, Larry

If the problem is from the expansion in different directions of the 
dowel and the wood,
might it work to use a round rod of something which is not wood?

Of course, one could use something like brass rod, but then if someone 
needed to
cut through the joint later, it might be troublesome. Perhaps something 
like the polyethelene
which Bill Spurlock uses for his cauls and other tools? Does it come in 
dowels?

Susan Kline



Larry Fisher RPT wrote:
> I’ve always enjoyed doweling a glue joint when possible.  Even an 
> eighth inch dowel across the break can improve the bond if only from a 
> mechanical aspect.  Recently however, this young man I mentioned 
> earlier reported seeing a glue joint fail from what he considered to 
> be the tension created by the cross grained conflicting expansion and 
> contraction  ..........  or at least that’s the way I understood his 
> explanation.  The object of discussion was a grand leg whose 
> laminations were separating.  I’d welcome any additional thoughts or 
> comments on this.
>
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