Screw withdrawal force is an indicator of the
strength, density and shear modulus of wood. Therefore, Fakopp Enterprise has
developed a portable screw withdrawal force meter. The applied screw diameter
is 4mm, the length of the thread is 18 mm. The screw withdrawal force is a
local parameter, but selecting a representative locations on a beam, it can
provide useful information in wooden structure evalsuation.
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Drive the screw into the wood material,
perpendicular to its surface.
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Connect the cable of the force transducer to the
display unit R320.
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Switch on the unit by pressing the “ON” button for 3
seconds.
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Select the Peak hold function.
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Start the screw withdrawal process by placing the
mechanics over the screw. Catch the screw head by the fork of the force
transducer.
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Slowly turn the handle clockwise until the screw is
removed. The speed of the withdrawal should be approximately 0.5 mm/s.
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Record the maximal force value and press the “Max”
button before the next test to reset the display.
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Screw withdrawal mechanics with force transducer
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Display unit, R320
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Screws and screwdriver
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Rechargeable battery and charger
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Aluminium carrying box
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10 special screws
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User manual