University Of Tasmania
147170_Friction correction when predicting wood basic density using drilling resistance.pdf (5.47 MB)

Friction correction when predicting wood basic density using drilling resistance

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journal contribution
posted on 2023-05-21, 03:13 authored by Gendvilas, V, Downes, GM, Mark Neyland, Mark HuntMark Hunt, Jacobs, A, Julianne O'Reilly-WapstraJulianne O'Reilly-Wapstra
Basic density is a fundamental wood property of pulp and sawn wood. An IML Resi PD 400 drilling resistance tool (IML System GmbH, Wiesloch, Germany) was used to evaluate the basic density of Eucalyptus nitens discs and the impact of needle friction on basic density prediction. To determine the accuracy of that prediction with the commonly used linear drill bit shaft friction correction and determine whether this correction is linear, 40 discs were drilled radially, then cut into segments which were measured for basic density. Drilling resistance had a strong relationship with basic density in the outer wood; it was weaker at the pith but this did not compromise prediction accuracy. When using a linear friction correction, the drilling resistance underpredicts basic density by 7.6% in the first 2–3 cm after stem entry, after which the prediction error ranged from 0.6–1.9%. The friction correction was found to be nonlinear, especially at the first few centimeters. To apply this friction correction, basic density values from the model should be added to predict basic density values until 2.9 cm from Resi entry point and after that subtracted to account for the drill bit shaft friction.


Australian Research Council

Forest & Wood Products Australia Limited

Forestry Tasmania

Forico Pty Ltd

Greening Australia (TAS) Ltd

JM Roberts Charitable Trust

Sustainable Forest Management Pty Ltd


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School of Natural Sciences


Walter De Gruyter & Co

Place of publication

Genthiner Strasse 13, Berlin, Germany, D-10785

Rights statement

© 2020 Walter de Gruyter GmbH, Berlin/Boston

Repository Status

  • Open

Socio-economic Objectives

Hardwood plantations