Sanding is a common machining method to obtain good surface quality. The 2D surface roughness Ra presents high error due to the biological structure of wood materials. In this study, a new calibration method of reference plane is proposed to measure 3D surface roughness Sa, especially for large format panels. Besides, the effects of G (granularity) on Ra, Sa and θ (equilibrium contact angle) are investigated on Korean pine (Pinus koraiensis Sieb. Et Zucc.), JATOBA (Hymenaea cunrbaril L.) and medium density fiberboard (MDF) respectively. The experimental results show the standard deviations of Sa are much lower than that of Ra. As G increased, the variation of Ra, Sa and θ of Korean pine and JATOBA are distinct from MDF. The results of Grey Relevancy Degree (GRD) indicate MDF shows an obscure correlation between Sa and θ. The correlation between Sa and θ for Korean pine is the highest.

打磨是获得良好表面质量的常用加工方法。由于木质材料的生物结构，二维表面粗糙度Ra表现出很高的误差。在这项研究中，提出了一种新的参考平面校准方法来测量3D表面粗糙度Sa，特别是对于大幅面面板。此外，研究了G（颗粒度）对红松（Pinus koraiensis Sieb。Et Zucc。），JATOBA（Hymenaea cunrbaril L.）和中密度纤维板（MDF）对Ra，Sa和θ（平衡接触角）的影响。。实验结果表明标准偏差为Sa比Ra低得多。随着G的增加，红松和JATOBA的Ra，Sa和θ的变化与MDF明显不同。灰色关联度（GRD）结果表明，MDF显示Sa与θ之间的模糊关系。之间的相关性萨和θ为的韩国松最高。