Abstract
Wooden or wood-plastic composite surfaces are often valued for their aesthetic appearance and the quality of the surface. Independent from the technology, the surface features may be assessed using typical roughness parameters. In this paper, a pneumatic non-contact method is proposed. Despite certain limitations in surface characteristics measurement, air gauges proved to be a good tool for wooden surfaces, much cheaper than the laser profilometers. In the current research, a novel non-contact air gauge was combined with a slider to eliminate the influence of the asperities of higher order (waviness) and to protect the wooden surface from being damaged by the measuring nozzle. The measurement signal was used to control a follower that kept constant distance between the surface and the nozzle edge. The measuring speed was set at 0.8 mm/s, and the back-pressure was measured with accuracy of 0.01 kPa with real time acquisition. A series of measurements was taken, and the results were compared with the ones obtained from Perthen S8P profilometer (contact measurement) and WYKO NT 1100 interferometer microscope.
Highlights
Surface quality of the machined wood is one of the most important characteristics that has impact on further manufacturing processes, such as finishing, and subsequently effects on the strength of adhesive joints etc. (Aguilera et al 2016)
Wooden or wood-plastic composite (WPC) surfaces are often valued for their aesthetic appearance, for example, in the case of furniture
The results of air gauge measurement should be related to the initial settings, not to other devices
Summary
Surface quality of the machined wood is one of the most important characteristics that has impact on further manufacturing processes, such as finishing, and subsequently effects on the strength of adhesive joints etc. (Aguilera et al 2016). Wooden or wood-plastic composite (WPC) surfaces are often valued for their aesthetic appearance, for example, in the case of furniture In both cases the appearance depends on the quality of the surface, which must be machined and finished in a proper way. Despite certain limitations in surface characteristics measurement, air gauges proved to be a good tool for profile measurement and out-of-roundness assessment both in dynamic (Jermak and Rucki 2016a) and in static perspective (Jermak and Rucki 2016b). These devices may have either analog or digital displays (Bewoor and Kulkarni 2009), and many companies today offer the air-electronic solutions in their catalogues. Their application to the wooden surface assessment seemed to be promising and reasonable (Pohl and Jermak 2007), and the current work provided a good basis for wooden surface assessment with air gauges playing the main role in the novel follower-type measurement system
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