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Reply by Steve Peterson

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Posted on Are Most Benchtops Woefully Underclamped during Glueup? (probably not)

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Steve Peterson

262 posts in 1829 days


#1 posted 12-06-2012 10:53 PM

Nicholas,

That is very interesting data, Nicholas. I wonder what the chart would look like regarding glue strength vs clamping pressure. You get the maximum glue strength in flatsawn sugar maple at 1200 psi. This does not imply that you only get 10% as much strength at 120 psi and 1% as much strength at 12 psi.

It certainly does not seem possible to starve a joint of glue by applying too much pressure. The only way I can see to starve a glue joint would be to squeeze out most of the glue then reduce the pressure while the glue dries.

I did notice a statement on a bottle of veneer glue recommending something like 750 psi. A vacuum press can only generate a max of around 14 psi and this is the most pressure that an average woodworker can produce in their shop.

-- Steve


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