Pneumatic Press Bending

[Erwinspiano@AOL.COM]

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> ----- Original Message -----
> From: "Farrell" <mfarrel2@tampabay.rr.com>
> To: <pianotech@ptg.org>
> Sent: February 17, 2002 6:34 AM
> Subject: Pneumatic Press Bending
> .     

         Diito that Del  40to 45 lbs. pressure. Above 60 is scary.
>>>Dale
> 
> 
> I tested a bunch of different pressures with rib-to-soundboard joints a few
> years back. Below about 30 lbs the failure was predominately glue failure
> from thick glue joints. Above 70 lbs or so (I don't remember the exact
> figures) the failure was primarily due to starved glue joints. The 
> strongest
> adhesive bonds resulted from pressures between about 40 lbs and 60 lbs 
> where
> the predominate failure was with the wood. We use between 40 and 45 lbs in
> our press.
> 
> Del
> 


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