Mechanics of Wood Machining

Csanády, Etele; Magoss, Endre

doi:10.1007/978-3-030-51481-5

Cited by 18 publications

(22 citation statements)

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“…Our results show that C. acinaciformis is very selective when it comes to foraging decisions even for only small amounts of wood, contrary to the widespread perception of termites being indiscriminating feeders [13,44]. Termites were attracted to higher density wood (range of 94.7 kg m 23 )possibly due to its higher energy content [33]. However, they were averse towards late wood [26], which is in fact very dense, but mechanically stronger, hard to machine and presumably associated with higher mandible wear rates [45].…”

Section: Discussionmentioning

confidence: 59%

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Key physical wood properties in termite foraging decisions

Oberst

Lai

Evans

2018

J. R. Soc. Interface.

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As eusocial and wood-dwelling insects, termites have been shown to use vibrations to assess their food, to eavesdrop on competitors and predators and to warn nest-mates. Bioassay choice experiments used to determine food preferences in animals often consider single factors only but foraging decisions can be influenced by multiple factors such as the quantity and quality of the food and the wood as a medium for communication. A statistical analysis framework is developed here to design a single bioassay experiment to study multifactorial foraging choice (Pinus radiata) in the basal Australian termite species Coptotermes (C.) acinaciformis (Isoptera: Rhinotermitidae). By employing a correlation analysis, 17 measured physical properties of 1417 Pinus radiata veneer discs were reduced to five key material properties: density, moisture absorption, early wood content, first resonance frequency and damping. By applying a fuzzy c-means clustering technique, these veneer discs were optimally paired for treatment and control trials to study food preference by termites based on these five key material properties. A multifactorial analysis of variance was compared to a permutation analysis of the results indicating for the first time that C. acinaciformis takes into account multiple factors when making foraging decisions. C. acinaciformis prefer denser wood with large early wood content, preferably humid and highly damped. Results presented here have practical implications for food choice experiments and for studies concerned with communication in termites as well as their ecology and coevolution with trees as their major food source.

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Section: Discussionmentioning

confidence: 59%

“…Termites prefer wood with a larger early wood proportion, which is usually brighter in colour than late wood [26,33]. Late wood is rarely consumed, owing to differences in its chemical composition, structure and lignin content [22,30,34,35].…”

Section: Extracting Propertiesmentioning

confidence: 99%

Key physical wood properties in termite foraging decisions

Oberst

Lai

Evans

2018

J. R. Soc. Interface.

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“…Another group of problems are the economic issues of the used technology; in other words, obtaining high quantitative efficiency and productivity and the expected surface quality and/or accuracy of the shape for the workpieces. These two groups of problems are solved by properly selecting the production equipment, parameters of the abrasive tools and parameters of the sanding process [7,8].…”

Section: Introductionmentioning

confidence: 99%

Efficiency of Machine Sanding of Wood

et al. 2021

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We hypothesized that the type of wood, in combination with the grit size of sandpapers, would affect sanding efficiency. Fixed factors were used in the experiment (a belt sander with pressure p = 3828 Pa, and a belt speed of vs = 14.5 m/s) as well as variable factors (three sand belts (P60, P120, P180), six hardwood species (beech, oak, ash, hornbeam, alder, walnut) and three softwood species (pine, spruce, larch)). The masses of the test samples were measured until they were completely sanded. The sanding efficiency of hardwood species is less variable than for softwood species. Maximum sanding efficiency for the softwood ranged from 1 to 2 min, while for the hardwood species, it ranged from 2 to 4.5 min at the start of sanding and then decreased. The average time for complete sanding of the softwood samples was: 87 s (P60), 150 s (P120), and 188 s (P180). For hardwood, these times were 2.4, 1.5, and 1.8 times longer. The results indicate that the factors determining sanding efficiency are the type of wood, and, secondly, the grit size of sanding belts. In the first phase of blunting with the sanding belts, the sanding processes of hardwood and softwood are significantly different. In the second phase of blunting, sanding belts with higher grit numbers (P120 and P180) behaved similarly while sanding hardwood and softwood.

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“…Scientists from other countries are conducting research on the development of hand-held electrified tools, taking into account the processes of wood cutting [1][2]. Works [3][4][5][6] are devoted to general design issues of linear motors.…”

Section: Introductionmentioning

confidence: 99%

Study of linear electric motor magnetic system of hand-held electrified tool

Антонов

2021

20th International Scientific Conference Engineering for Rural Development Proceedings

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In modern gardening, there are many technological processes that use hand tools. These processes account for about 40% of the labor costs in the process of gardening. In this regard, the cost of horticultural products increases, which affects their competitiveness in the market economy. The use of an electrified or mechanized tool will improve the production efficiency and reduce the cost of horticultural products. Currently, hydraulic and pneumatic drives are widely used. However, these drives have many disadvantages that lead to a decrease in the efficiency of the installations. Therefore, the electric drive is increasingly used. The existing electrified tool uses a DC motor as an electric drive. The most unreliable element of the motor is the brush mechanism. The use of a linear electric motor for the drive of the tool will increase its operational reliability and energy efficiency. This is possible due to the advantages of the linear electric drive, such as simplification of the mechanical part, increased speed and positioning accuracy of the electric motor armature. The proposed electric drive is characterized by low noise level and ease of maintenance. This stage in the development of a linear electric drive is characterized by a small range of tasks to be solved. The proposed design of a linear electric motor will allow, in general, to consolidate the possibility of its use in agricultural production, and in particular for a handheld electrified tool for caring for a garden. Modern design of electrical devices should use existing software systems for modeling magnetic systems. This will make it possible to more effectively solve the problem of increasing the efficiency of the magnetic system of the electric motor. To study the magnetic system of a linear electric motor, we use the ElCut program. The aim of the study is to optimize the magnetic system of the linear electric motor of a hand-held electrified tool. This will increase the force generated by the magnetic field acting on the armature. As a result of the research, the maximum value of the electromagnetic force reaches 53.7 N. In the further design of the power tool, it is necessary to correctly select the kinematic diagram for its effective operation.

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Mechanics of Wood Machining

Cited by 18 publications

References 0 publications

Key physical wood properties in termite foraging decisions

Key physical wood properties in termite foraging decisions

Efficiency of Machine Sanding of Wood

Study of linear electric motor magnetic system of hand-held electrified tool

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