Trposki, Zoran
Preferred name
Trposki, Zoran
Official Name
Trposki, Zoran
Main Affiliation
Email
trposki@fdtme.ukim.edu.mk
10 results
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Item type:Publication, ANALYSIS OF QUALITY CONTROL METHODS IN THE FURNITURE FACTORY "DIVA DIVANI" VRANJSKA BANJA(FDTME-Skopje, 2025-09); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Impact of feed rate on roughness of the cut surface and energy consumption during cutting dry beech wood with a circular saw(FACULTY OF FOREST INDUSTRY – UNIVERSITY OF FORESTRY – SOFIA, 2024); The feed rate during mechanical processing of wood is one of the factors that has a high influence on the roughness of the cut surface and energy consumption. The roughness of the cut surface caused by traces of the cutting tool has an influence on the hydrothermal treatment and all other mechanical treatments of the wood. Greater roughness, due to faster evaporation of moisture from the wood, increases the percentage of drying errors. On the other hand, higher roughness values decrease the lumber yield. Energy consumption is an indicator of the cutting resistance and it depends directly proportionally, or inversely proportionally when the thickness value of the sawdust is less than 0.1 mm. At the same time, the teeth do not cut the wood and they do not create sawdust but wood dust. In this research, three different feed rates were applied (U1=12 m·min-1, U2=16 m·min-1 and U3=20 m·min-1) for a constant cutting height of 45 mm in dry beech wood with moisture content W=10±1%. The measurements were made with a circular saw with diameter of cutting tool D=250 mm, number of teeth Z=40 and width of the cut b=3,2 mm. The number of rounds was n=5500 min-1. Roughness measurements were taken with a digital comparator, according to the Rmax criterion. Measurement data for energy consumption were taken with a clamp amperemeter. The obtained results showed a pronounced significance, directly proportional dependence of the roughness of the cut surface and energy consumption on the feed rate - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Impact of feed rate on roughness of the cut surface, during cutting dry beech and spruce wood with a circular saw(Ss. Cyril and Methodius University, Skopje, North Macedonia, Faculty of Design and Technologies of Furniture and Interior, Skopje, 2025-11); ; ; The precision of wood processing and the quality of the machined surface are critical factors in achieving the desired processing outcomes. These factors are influenced by a variety of parameters, among which the feed rate during mechanical processing plays a significant role in determining the surface roughness of the cut. Surface roughness, often caused by tool marks, affects subsequent hydrothermal treatments and other mechanical processes, ultimately reducing the efficiency of wood usage when it is too high. For this purpose, in this paper, the dependence of the feed rate on the roughness of beech and spruce wood during the cutting of dry wood with a circular saw is investigated, with the intention of determining the optimal cutting conditions for obtaining lower values of the roughness. In this research, three different feed rates were applied (U1 = 12 m·min-1 , U2 = 16 m·min-1 and U3 = 20 m·min-1 ) for a constant cutting height of 15 mm in dry beech and spruce wood with moisture content W = 10 ± 1%. The measurements were made with a circular saw with a diameter of cutting tool D = 250 mm, a number of teeth Z = 40 and a width of the cut b = 3.2 mm. The number of rounds was n = 5500 min-1 . Roughness measurements were taken with a digital comparator, according to the Rmax criterion. The obtained results showed a pronounced significance and a directly proportional dependence of the roughness of the cut surface on the feed rate - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Processing sawlogs into parquet blanks(FACULTY OF FOREST INDUSTRY – UNIVERSITY OF FORESTRY – SOFIA, 2024-12); ; ; ; The term parquet refers to a floor covering made of solid wood, consisting of interconnected slats in a horizontal plane. A parquet strip is the principal constructional element of the parquet. This wooden strip is obtained as a result of processing the flooring blank. In the sawmill processing of the sawlogs, the flooring blanks are sawn from the sawlogs, mostly in the radial and tangential direction. For such a purpose, sawlogs from domestic species and foreign species are used. Most dominant in this manner are the hardwood species, although softwood species can be used too. Among the domestic species, the most are beech, oak, acacia, elm, ash, and from the softwood species pine and larch. The paper focuses on the maximum quantitative yield of beech and oak sawlogs intended for processing into parquet blanks. The sawing was conducted on a bandsaw. The blanks were with a thickness of 25,0 mm. The sawlogs belonged to the I, II, and III quality classes. A total of 12 sawlogs were processed, 6 from beech (Fagus sylvatica L.) and 6 from oak (Quercus robur). All sawlogs were with a constant length of 3,0 m. The mean diameter for beech and oak sawlogs was in the range of 34,0 to 36,0 cm. The average value for the quantitative yield for beech sawlogs from I, II, and III quality classes was 37,90%. For the oak sawlogs from I, II, and III quality classes the average value of the quantitative yield was 39,40%. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, IMPACT OF FEED RATE ON ENERGY CONSUMPTION DURING CUTTING DRY BEECH AND SPRUCE WOOD WITH A CIRCULAR SAW(FDTME - Skopje, 2025-09); ; ; Stanojevic, DamjanIn industrial production, the primary goal is achieving the desired end result; however, it is equally important to ensure that the entire technological process is carried out as cost-effectively as possible. Several key factors influence this efficiency, including the material and geometry of the cutting tool, the properties of the processed wood, and the feed rate. Among these, the feed rate during mechanical wood processing has a particularly strong impact on energy consumption. This paper focuses on the relationship between feed rate and energy consumption during the cutting process of dry beech and spruce wood using a circular saw. The objective is to identify optimal cutting conditions that minimize energy usage. Three different feed rates were tested: U1 = 12 m·min⁻¹, U2 = 16 m·min⁻¹, and U3 = 20 m·min⁻¹, at a constant cutting height of 15 mm. The tested wood samples (beech and spruce) had a moisture content of W = 10 ± 1%. The experiments were conducted using a circular saw with a cutting tool diameter of D = 250 mm, 40 teeth (Z = 40), and a kerf width of b = 3.2 mm. The number od rounds was n = 5500 min⁻¹. Energy consumption was measured using a clamp ammeter. The results demonstrated a clear, directly proportional relationship between the feed rate and energy consumption - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Analysis of heat and steam consumption during artificial convective drying of oak sawn timber of different thickness(Faculty of Design and Technologies of Furniture and Interior - Skopje, 2023-09); ; ; ; In the paper, the consumption of heat and steam of oak sawn timber with a thickness of 25,0 and 50,0 (mm) are analyzed under conditions of classic convective drying. The drying mode is compiled on the basis of data on the temperature of the drying agent (air), the relative humidity of the air and the speed of air movement in accordance with the current value of moisture in the wood. The heat consumption is analyzed in all stages of the drying cycle such as heating the wood, active drying of the wood, equalization of the average moisture in the wood and conditioning, i.e. equalization of the moisture in the cross-section within ± 2.0 (%). The moisture content of sawn timber at the beginning of drying is about 55,0 (%) and at the end of drying is 10,0 (%). The sawn timber are intended for the production of solid wood panels. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Evaluation of Processing Time in Primary Sawmilling of Scots Pine (Pinus sylvestris) Logs on a Vertical Band Saw(Department of Wood Technology, Faculty of Forestry and Wood Tehnology, University of Zagreb, Croatia, 2025); ; ; ; The efficiency of primary wood processing largely depends on the optimal utilization of macines and tools. Beyond the rational use of sawlogs in sawmilling, the profitability and effective operation of sawmill capacities critically rely on the efficient application of primary processing machines. These machines are primarily tasked with transforming logs into semi-finished products, through which logs are converted into sawn timber through the sawing process. Among the most implemented machines for primary processing are band saws. These types of primary machines allow individual log sawing, where each log is processed separately according to its dimensions and quality class. In such operations, determining the technological capacity is essential, defined as the volume of logs a machine can process within a given timeframe. A key factor affecting technological capacity is the processing time per log, which represents the cumulative duration of all sawing operations and factors involved in sawing , such as log rotation, number of cuts, log length and other related activities. The processing time can be divided into components dependent on the machine’s technological parameters and those influenced by the organization of production within the sawmill. This study presents a detailed analysis of processing times for Scots pine (Pinus sylvestris) sawlogs using a vertical band saw. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, IMPACT OF FEED RATE ON ENERGY CONSUMPTION DURING CUTTING DRY BEECH WOOD WITH A CIRCULAR SAW(Faculty of forestry and wood technology, University of Zagreb, Croatia, 2023-12); The feed rate during mechanical processing of wood is one of the factors that has a high impact on energy consumption. Energy consumption is an indicator of cutting resistance and depends directly proportionally, that is, inversely proportionally when the thickness of the sawdust is less than 0,1mm. At the same time, the teeth do not cut the wood, i.e. they do not create sawdust but wood dust. The friction of the teeth on the wood is increased, the temperature in the contact zone increases and the teeth blunted quickly. For this purpose, this paper investigates the dependence of the feed rate on the energy consumption of beech wood, when cutting dry wood with a circular saw, with the intention of determining the optimal cutting conditions for obtaining optimal values of energy consumption. In this research, three different feed rates were applied (U1=12mmin-1, U2=16mmin-1 and U3=20mmin-1) for a constant cutting height of 45mm in dry beech wood with humidity of W=10±1%. The measurements were made with a circular saw with a diameter of D=250mm, number of teeths Z=80 and width of the cut b=3,2mm. The number of revolutions is n=5500 min-1. Measurement data for energy consumption were taken with a clamp ampermeter. The obtained results show a pronounced significance, i.e. directly proportional dependence of the energy consumption on the feed rate - Some of the metrics are blocked by yourconsent settings
Item type:Publication, OPTIMIZATION OF SCHOOL CHAIR DESIGN USING FINITE ELEMENT METHOD ANALYSIS(FDTME-Skopje, 2025-09); ; The aim of the research presented in this paper was to study the possibilities of using the SOLIDWORKS Simulation software application to determine the optimal values of the structural and strength characteristics in the design process of a school chair. By using an optimization analysis module, a simulation of the real loads on a school chair was carried out. Through several iterations with virtual prototypes, the optimal values for the dimensions of the elements were determined from the aspect of durability of static loads - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Impact of Length and Diameter Variations in Beech (Fagus sylvatica L.) Sawlogs on the Yield and Waste(Faculty of Design and Technologies of Furniture and Interior - Skopje, 2024-12); ; ; ; This study evaluates the yield and waste distribution in beech (Fagus sylvatica L.) sawlogs, focusing on the influence of log length and diameter. Two log lengths, 4.0 m and 5.0 m, were analysed across various diameter classes. The research examines the relationship between log geometry and the quantitative utilisation of raw materials, emphasising the impact on sawn timber yield, coarse waste, fine waste, and shrinking allowance. Experimental sawings were conducted on a vertical bandsaw in a saw mill optimised for moderate-capacity production. Statistical analysis of the data reveals significant differences in yield efficiency between the two log lengths. Logs with shorter lengths (4.0 m) demonstrated lower quantitative yield compared to longer logs (5.0 m) due to reduced taper effects and enhanced sawmill processing efficiency. Similarly, larger diameters were correlated with increased sawn timber yield, whereas smaller diameters resulted in higher proportions of waste. The waste distribution analysis highlighted that coarse waste formed the largest component, followed by fine waste, both influenced by log dimensions and quality. Precision in sawmill operations was demonstrated by the diminishing allowance, which provided a small but constant proportion to all logs. The findings underscore the importance of optimising log selection and processing parameters to maximise resource efficiency and minimise waste. This study provides insights into sustainable practices in beech sawlog processing, supporting the development of optimised sawing techniques for improved material utilisation. The results contribute to a better understanding of how log characteristics impact industrial processing outcomes, informing decision-making for sawmill operations and forest management strategies.