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Dowel Pins, The Difference
Expansible Dowel Pins
Compressed Loose Tenons
Tenons – The Difference
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Testing the ability
of the joinery components to withstand withdrawal is the goal. The method consists of holes drilled
Hard Maple with dowels or tenons glued in place so that some of the pin or tenon protrudes above the wood. This assembly is set aside to let the glue cure and for the moisture to dissipate.
The assembly would be placed on a recording load cell
so that the pin or tenon can be pushed through with pressure applied in a
motion until the joint fails. This pressure is recorded by an electronic recorder eliminating any inaccuracies of trying to see a pressure gauge at the point of failure.
should be accomplished in a metal jig so that the materials used as the mortise cannot affect the actual pressure required to shear the tenon or pin. The recording load cell is used to record the result.
Another issue is testing
multiple elements and in most cases comparing joints that don’t have equal surface areas. Testing one dowel or tenon at a time and then calculating surface area is the only way to get a true measure of each component.
Using woods like Cherry
to create joints usually tests the strength of the wood and not the joint
Testing a joint
made with a wood that isn’t as strong as the joinery elements and then subjecting that joint to stress by deflecting the joint away from 90 degrees proves nothing. An accurate picture of joint quality isn’t possible unless joint strength, sheer and the wood used to make the joint can be separated.
Tearing a joint apart
using a bottle jack confuses, withdrawal, sheer, the strength of the wood used for all parts of the joint. Using anything other than a recording load cell will not accurately record anything, pressure gauges and bathroom scales cannot be relied upon to give accurate or reliable results.
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