KARAKTERISTIK DINAMIK COMPUTER NUMERICAL CONTROL MILLING ROUTER 4 AXIS

Penelitian ini dilakukan untuk mengetahui karakteristik dinamik Computer Numerical Control Router 4 Axis dengan menggunakan metode Bump Test. Pengujian dilakukan dengan cara menempatkan sensor Accelerometer Khoctek 107b pada Mesin CNC Router 4 Axis pada sumbu x, y, z dikerangka atas, kerangka bawah, dan spindle. Hasil eksperimen pengujian getaran Mesin CNC dibagi kedalam dua proses pengujian yaitu kondisi normal dan kondisi rusak pada masing-masing sumbu. Diperoleh bahwa pengujian ini menghasilkan frekuensi global dimana frekuensi 8 Hz, 24 Hz, dan 40 Hz muncul disetiap sumbu x, y, dan z pada kerangka atas, kerangka bawah dan spindle. Pada mesin dengan kondisi rusak muncul frekuensi lokal pada sumbu y kerangka atas sebesar 5 Hz. Kemudian pada sumbu y spindle muncul frekuensi lokal sebesar 10 Hz, 56 Hz, dan 88 Hz. Munculnya frekuensi lokal menandakan adanya kerusakan pada CNC oleh sumbu tertentu selain frekuensi global.

Advancing Craft: A translation to modern tectonics

<p>Well-made joinery can be pricey, no matter if it is hand-crafted or prefabricated. This thesis attempts to understand all available tectonics used to fabricate joints and find a potential alternative to generate well-made joints in a more accessible manner. Specifically looking at traditional Japanese carpentry, Japanese joinery is a crucial precedent for examining due to its prestigious nature for withstanding the test of time and earthquakes. Here following the crafting of traditional joints is necessary to understand the hand-tool tectonic, allowing for an understanding to then iterate joints in the other tectonics with machine-tools and information-tools. Retrofitting provides for the opportunity for owners to add additional components to their existing properties. The standard residential home is commonly retrofitted by the owners to follow the ‘trend’ and ‘personalise’ their home. The want for retrofitting is usually due to the basic nature of cookie-cutter homes that are common to the New Zealand suburbs. By studying ways to construct joints, methods of fabricating joinery can assist the DIY culture in New Zealand, whether through prefabrication on the CNC router that is sold as kitsets or machine jigs that can be made onsite.</p>

Advancing Craft: A translation to modern tectonics

<p>Well-made joinery can be pricey, no matter if it is hand-crafted or prefabricated. This thesis attempts to understand all available tectonics used to fabricate joints and find a potential alternative to generate well-made joints in a more accessible manner. Specifically looking at traditional Japanese carpentry, Japanese joinery is a crucial precedent for examining due to its prestigious nature for withstanding the test of time and earthquakes. Here following the crafting of traditional joints is necessary to understand the hand-tool tectonic, allowing for an understanding to then iterate joints in the other tectonics with machine-tools and information-tools. Retrofitting provides for the opportunity for owners to add additional components to their existing properties. The standard residential home is commonly retrofitted by the owners to follow the ‘trend’ and ‘personalise’ their home. The want for retrofitting is usually due to the basic nature of cookie-cutter homes that are common to the New Zealand suburbs. By studying ways to construct joints, methods of fabricating joinery can assist the DIY culture in New Zealand, whether through prefabrication on the CNC router that is sold as kitsets or machine jigs that can be made onsite.</p>

Comparative Surface Quality of Larch (Larix decidua Mill.) Fretwork Patterns Cut through by CNC Routing and by Laser

Fretwork, as a decorating technique, can today be performed with modern means by laser or CNC routing, but the tool influence on the surface quality must be well un\]=[-poitrwjerstood for further optimization of the cutting parameters. The paper presents an experimental work for the determination of the influence of the cutting angle with respect to the grain on the surface quality of larch wood (Larix Decidua Mill.) cut through by laser and CNC routing at different feed speeds. The research considered geometric fretwork patterns derived from triangle, where the cutting angles with respect to the wood grain were 0°, 15°, 30°, 45°, 60°, 75° and 90°. The feed speeds of the CNC routing were set for 2, 2.5, 3, 3.5 and 4 m/min. The surface quality was analyzed by a range of roughness, waviness and primary profile parameters combined with stereomicroscopic images. Although the principle of cutting and interaction with wood of the two processing tools, laser and CNC, is very different, the analysis with roughness parameters has revealed that the cutting angle with respect to the grain has an essential influence, whatever the cutting tool. The surface quality decreases with an increase in the feed speed of the CNC router and processing at 15° and 60° appears to be the worst option from all angle variants for both types of processing. Cutting by laser is melting wood in latewood areas resulting in a smoothing effect.

Comparative Study on Wood CNC Routing Methods for Transposing a Traditional Motif from Romanian Textile Heritage into Furniture Decoration

This paper presents experimental research on the Computer Numerical Control (CNC) routing of a traditional motif collected from Ţara Bârsei (Transylvania region) using two methods, namely, engraving (Engrave) and carving (V-Carve). The analysis of the CNC router processes includes the calculation of the path lengths, an assessment of the processing time and wood mass loss, and an evaluation of the tool wearing by investigating the tool cutting edge on a Stereo Microscope NIKON SMZ 18 before and after processing the ornament on wood. An aesthetic evaluation of the ornament routed on wood, using both the engraving and carving methods, is also conducted, whilst a microscopic analysis of the processed areas highlights the defects that occurred on the wood surface depending on the tool path.

Surface roughness of thermally treated wood cut with different parameters in CNC router machine

The effects of different machining parameters on surface roughness values of thermally treated pine, beech, and linden woods cut in a computer numerical control (CNC) router machine were examined. Wood specimens were thermally treated at 170, 190, and 210 °C for 2 h. Then, specimens were cut in the radial and tangential directions with three different spindle speeds (12000, 15000, and 18000 rpm) and three different feed rates (3000, 4000, and 6000 mm/min) using two different end mill tools (spiral and straight) on the CNC machine. The end mill type significantly affected the roughness values of the untreated and thermally treated specimens in both directions. Lower roughness values were found in the specimens (especially pine) machined with the straight end mill compared to those machined with the spiral end mill. Roughness generally decreased in the thermally treated specimens. However, thermal treatment temperature did not have a notable effect on roughness. As the spindle speed increased, the roughness values of all specimens decreased. In contrast, as the feed rate increased, the roughness values increased. Therefore, the end mill type, feed rate, and spindle speed were the most influential parameters on the roughness.

UTILIZING RESPONSE SURFACE METHODS DESIGNS FOR OPTIMIZATION OF TECHNOLOGICAL PARAMETERS ON THE VIBRATION AMPLITUDE OF CNC ROUTER SPINDLE

For CNC machines, machining accuracy is of ultimate importance since it determines the quality of the products. Among many factors, vibration amplitude and stiffness are the key ones that influence the machining accuracy of a CNC machine. Remarkably, it is essential to conduct study into structural stiffness and the effect of technological parameters on the vibration amplitude of CNC router spindle with various second-order designs in order to improve machining accuracy. The research focuses on the application and comparison of the response-surface methods, the experimental research on the factors affecting the vibration amplitude, and the determination of the optimal working parameters for the CNC router.

Dimensional Analysis under Linguistic Pythagorean Fuzzy Set

Dimensional analysis under linguistic Pythagorean fuzzy set (DA-LPFS) is a technique to handle qualitative (intangible) as well as the interactions between criteria, by combining dimensional analysis (DA) and Pythagorean fuzzy set (PFS) with linguistic variables. In this paper, a novel DA method is proposed for LPFSs based in a PFS extension, in order to consider the mutual relationship among criteria and handle qualitative (fuzzy) and quantitative (crisp) information usually involved in Multi-criteria decision making (MCDM) problems. Finally, DA-LPFS is applied to handle a case concerning the selection of CNC router to illustrate the applicability of the method.