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[nazev_en] => Machining of pure molybdenum using WEDM
[popis_en] => Wire electrical discharge machining (WEDM) is an unconventional technology that is
indispensable in almost all industries. However, due to its energy demands, the effort is
to maximize the cutting speed with an emphasis on maintaining the quality of
machined surfaces, which also often contain a number of defects in the form of cracks
or burnt cavities. For this reason, the aim of this study was to find the optimum setting
of the machine parameters using a design of experiment consisting of 33 rounds, with
the material of pure molybdenum being examined. An extensive analysis of all
machined samples was performed in terms of defects occurrence in the surface and
subsurface layers, the analysis of topography and morphology including 3D surface
reliefs, the analysis of chemical composition with dependence on diffusion processes
and measurement of residual stress in the workpieces.
[klicova_slova_en] => WEDM; Electrical discharge machining; pure molybdenum; Design of experiment;
cracks; machining parameters
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)
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(
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[nazev] => Study of micro structural material changes after WEDM based on TEM lamella analysis
[nazev_orig] => Study of micro structural material changes after WEDM based on TEM lamella analysis
[duvernost_udaju_id] => S
[popis] => Wire electrical discharge machining is an unconventional machining technology that is crucial in many industries. The surface quality of the machined parts is carefully monitored, but the condition of the subsurface layer also plays a crucial role, especially in case of defects occurrence such as cracks or burnt cavities. The subsurface layer of individual materials is affected differently due to wire electrical discharge machining. For this reason, this study was carried out focusing on a detailed analysis of transmission electron microscope (TEM) lamellae made of Ti-6Al-4V titanium alloy, AlZn6Mg2Cu aluminium alloy, pure molybdenum, Creusabro 4800 steel, and Hardox 400 steel. The attention was first of all paid to the concentration and distribution of individual elements in the recast layer and also in the base material, which was often affected by Wire electrical discharge machining. Further, a diffraction analysis was performed for each TEM lamella in the adhesive area and in the area of the base material. In order to assess the macro-effects on the machined material, the analysis of the topography of the machined surfaces and the morphology analysis were performed using electron microscopy.
[popis_orig] => Wire electrical discharge machining is an unconventional machining technology that is crucial in many industries. The surface quality of the machined parts is carefully monitored, but the condition of the subsurface layer also plays a crucial role, especially in case of defects occurrence such as cracks or burnt cavities. The subsurface layer of individual materials is affected differently due to wire electrical discharge machining. For this reason, this study was carried out focusing on a detailed analysis of transmission electron microscope (TEM) lamellae made of Ti-6Al-4V titanium alloy, AlZn6Mg2Cu aluminium alloy, pure molybdenum, Creusabro 4800 steel, and Hardox 400 steel. The attention was first of all paid to the concentration and distribution of individual elements in the recast layer and also in the base material, which was often affected by Wire electrical discharge machining. Further, a diffraction analysis was performed for each TEM lamella in the adhesive area and in the area of the base material. In order to assess the macro-effects on the machined material, the analysis of the topography of the machined surfaces and the morphology analysis were performed using electron microscopy.
[klicova_slova] => WEDM; electrical discharge machining; microstructure; TEM lamella; recast layer; topography; morphology
[klicova_slova_orig] => WEDM; electrical discharge machining; microstructure; TEM lamella; recast layer; topography; morphology
[url] => https://www.mdpi.com/2075-4701/10/7/949/htm
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[citace_text] => MOURALOVÁ, K.; ZAHRADNÍČEK, R.; BENEŠ, L.; PROKEŠ, T.; HRDÝ, R.; FRIES, J. Study of micro structural material changes after WEDM based on TEM lamella analysis. Metals, 2020, vol. 10, no. 7, p. 1-21. ISSN: 2075-4701.
[citace_html] => MOURALOVÁ, K.; ZAHRADNÍČEK, R.; BENEŠ, L.; PROKEŠ, T.; HRDÝ, R.; FRIES, J. Study of micro structural material changes after WEDM based on TEM lamella analysis. Metals, 2020, vol. 10, no. 7, p. 1-21. ISSN: 2075-4701.
[citace_rtf] =>
[citace_bibtex] => @article{BUT164200,
author="Kateřina {Mouralová} and Radim {Zahradníček} and Libor {Beneš} and Tomáš {Prokeš} and Radim {Hrdý} and Jiří {Fries}",
title="Study of micro structural material changes after WEDM based on TEM lamella analysis",
journal="Metals",
year="2020",
volume="10",
number="7",
pages="1--21",
doi="10.3390/met10070949",
url="https://www.mdpi.com/2075-4701/10/7/949/htm"
}
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[nazev_en] => Study of micro structural material changes after WEDM based on TEM lamella analysis
[popis_en] => Wire electrical discharge machining is an unconventional machining technology that is crucial in many industries. The surface quality of the machined parts is carefully monitored, but the condition of the subsurface layer also plays a crucial role, especially in case of defects occurrence such as cracks or burnt cavities. The subsurface layer of individual materials is affected differently due to wire electrical discharge machining. For this reason, this study was carried out focusing on a detailed analysis of transmission electron microscope (TEM) lamellae made of Ti-6Al-4V titanium alloy, AlZn6Mg2Cu aluminium alloy, pure molybdenum, Creusabro 4800 steel, and Hardox 400 steel. The attention was first of all paid to the concentration and distribution of individual elements in the recast layer and also in the base material, which was often affected by Wire electrical discharge machining. Further, a diffraction analysis was performed for each TEM lamella in the adhesive area and in the area of the base material. In order to assess the macro-effects on the machined material, the analysis of the topography of the machined surfaces and the morphology analysis were performed using electron microscopy.
[klicova_slova_en] => WEDM; electrical discharge machining; microstructure; TEM lamella; recast layer; topography; morphology
[vysledek_datum] => 2020-06-07T00:00:00+02:00
)
[4] => Array
(
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[vysledek_druh_id] => ARTWOS
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[nazev] => Precision Machining of Nimonic C 263 Super AlloyUsing WEDM
[nazev_orig] => Precision Machining of Nimonic C 263 Super AlloyUsing WEDM
[duvernost_udaju_id] => S
[popis] => Wire electrical discharge machining (WEDM) is an unconventional and very efficient technology for precision machining of the Nimonic C 263 super alloy, which is very widespread, especially in the energy, aerospace and automotive industries. Due to electrical discharge, defects in the form of cracks or burned cavities often occur on the machined surfaces, which negatively affect the correct functionality and service life of the manufactured components. To increase the efficiency of the machining of Nimonic C 263 using WEDM, in this study, extensive design of experiments was carried out, monitoring input factors in the form of machine parameters like Pulse off time, Gap voltage, Discharge current, Pulse on time and Wire feed, the output of which was comprehensive information about the behaviour of such machined surfaces, which allowed the optimization of the entire machining process. Thus, the optimization of the Cutting speed was performed in relation to the quality of the machined surface and the machining accuracy, as well as an analysis of the chemical composition of the machined surfaces and a detailed analysis of the lamella using a transmission electron microscope. A detailed study of the occurrence of surface or subsurface defects was also included. It was found that with the help of complex optimization tools, it is possible to significantly increase the efficiency of the machining of the Nimonic C 263 super alloy and achieve both financial savings in the form of shortened machine time and increasing the quality of machined surfaces.
[popis_orig] => Wire electrical discharge machining (WEDM) is an unconventional and very efficient technology for precision machining of the Nimonic C 263 super alloy, which is very widespread, especially in the energy, aerospace and automotive industries. Due to electrical discharge, defects in the form of cracks or burned cavities often occur on the machined surfaces, which negatively affect the correct functionality and service life of the manufactured components. To increase the efficiency of the machining of Nimonic C 263 using WEDM, in this study, extensive design of experiments was carried out, monitoring input factors in the form of machine parameters like Pulse off time, Gap voltage, Discharge current, Pulse on time and Wire feed, the output of which was comprehensive information about the behaviour of such machined surfaces, which allowed the optimization of the entire machining process. Thus, the optimization of the Cutting speed was performed in relation to the quality of the machined surface and the machining accuracy, as well as an analysis of the chemical composition of the machined surfaces and a detailed analysis of the lamella using a transmission electron microscope. A detailed study of the occurrence of surface or subsurface defects was also included. It was found that with the help of complex optimization tools, it is possible to significantly increase the efficiency of the machining of the Nimonic C 263 super alloy and achieve both financial savings in the form of shortened machine time and increasing the quality of machined surfaces.
[klicova_slova] => WEDM; wire electrical discharge machining; nimonic; design of experiment;
machining parameters
[klicova_slova_orig] => WEDM; wire electrical discharge machining; nimonic; design of experiment;
machining parameters
[url] => https://www.mdpi.com/2079-6412/10/6/590
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[citace_text] => MOURALOVÁ, K.; BENEŠ, L.; BEDNÁŘ, J.; ZAHRADNÍČEK, R.; PROKEŠ, T.; FIALA, Z.; FRIES, J. Precision Machining of Nimonic C 263 Super AlloyUsing WEDM. Coatings, MDPI, 2020, vol. 10, no. 6, p. 1-20. ISSN: 2079-6412.
[citace_html] => MOURALOVÁ, K.; BENEŠ, L.; BEDNÁŘ, J.; ZAHRADNÍČEK, R.; PROKEŠ, T.; FIALA, Z.; FRIES, J. Precision Machining of Nimonic C 263 Super AlloyUsing WEDM. Coatings, MDPI, 2020, vol. 10, no. 6, p. 1-20. ISSN: 2079-6412.
[citace_rtf] =>
[citace_bibtex] => @article{BUT164350,
author="Kateřina {Mouralová} and Libor {Beneš} and Josef {Bednář} and Radim {Zahradníček} and Tomáš {Prokeš} and Zdeněk {Fiala} and Jiří {Fries}",
title="Precision Machining of Nimonic C 263 Super AlloyUsing WEDM",
journal="Coatings, MDPI",
year="2020",
volume="10",
number="6",
pages="1--20",
doi="10.3390/coatings10060590",
issn="2079-6412",
url="https://www.mdpi.com/2079-6412/10/6/590"
}
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[poznamka_metriky] =>
[nazev_en] => Precision Machining of Nimonic C 263 Super AlloyUsing WEDM
[popis_en] => Wire electrical discharge machining (WEDM) is an unconventional and very efficient technology for precision machining of the Nimonic C 263 super alloy, which is very widespread, especially in the energy, aerospace and automotive industries. Due to electrical discharge, defects in the form of cracks or burned cavities often occur on the machined surfaces, which negatively affect the correct functionality and service life of the manufactured components. To increase the efficiency of the machining of Nimonic C 263 using WEDM, in this study, extensive design of experiments was carried out, monitoring input factors in the form of machine parameters like Pulse off time, Gap voltage, Discharge current, Pulse on time and Wire feed, the output of which was comprehensive information about the behaviour of such machined surfaces, which allowed the optimization of the entire machining process. Thus, the optimization of the Cutting speed was performed in relation to the quality of the machined surface and the machining accuracy, as well as an analysis of the chemical composition of the machined surfaces and a detailed analysis of the lamella using a transmission electron microscope. A detailed study of the occurrence of surface or subsurface defects was also included. It was found that with the help of complex optimization tools, it is possible to significantly increase the efficiency of the machining of the Nimonic C 263 super alloy and achieve both financial savings in the form of shortened machine time and increasing the quality of machined surfaces.
[klicova_slova_en] => WEDM; wire electrical discharge machining; nimonic; design of experiment;
machining parameters
[vysledek_datum] => 2020-06-24T00:00:00+02:00
)
[5] => Array
(
[vysledek_id] => 165702
[vysledek_druh_id] => ARTWOS
[ex_vysledek_id] => 137552
[vysledek_rok] => 2020
[nazev] => WEDM used for machining high entropy alloys
[nazev_orig] => WEDM used for machining high entropy alloys
[duvernost_udaju_id] => S
[popis] => Unconventional wire electrical discharge machining technology (WEDM) is a key machining process, especially for machining newly emerging materials, as there are almost no restrictions (only at least minimal electrical conductivity) in terms of demands on the mechanical properties of the workpiece or the need to develop new tool geometry. This study is the first to present an analysis of the machinability of newly developed high entropy alloys (HEA), namely FeCoCrMnNi and FeCoCrMnNiC0.2 using WEDM. The aim of this study was to find the optimal setting of machine parameters for the efficient production of parts with the required surface quality without defects. For this reason, an extensive design of experiments consisting of 66 rounds was performed, which took into account the influence of five input factors in the form of pulse off time, gap voltage, discharge current, pulse on time and wire speed on cutting speed and the quality of the machined surface and its subsurface layer. The analysis of topography, morphology, subsurface layers, chemical composition analysis (EDX) and lamella analysis using a transmission electron microscope (TEM) were performed. An optimal setting of the machine parameters was found, which enables machining of FeCoCrMnNi and FeCoCrMnNiC0.2 with the required surface quality without defects.
[popis_orig] => Unconventional wire electrical discharge machining technology (WEDM) is a key machining process, especially for machining newly emerging materials, as there are almost no restrictions (only at least minimal electrical conductivity) in terms of demands on the mechanical properties of the workpiece or the need to develop new tool geometry. This study is the first to present an analysis of the machinability of newly developed high entropy alloys (HEA), namely FeCoCrMnNi and FeCoCrMnNiC0.2 using WEDM. The aim of this study was to find the optimal setting of machine parameters for the efficient production of parts with the required surface quality without defects. For this reason, an extensive design of experiments consisting of 66 rounds was performed, which took into account the influence of five input factors in the form of pulse off time, gap voltage, discharge current, pulse on time and wire speed on cutting speed and the quality of the machined surface and its subsurface layer. The analysis of topography, morphology, subsurface layers, chemical composition analysis (EDX) and lamella analysis using a transmission electron microscope (TEM) were performed. An optimal setting of the machine parameters was found, which enables machining of FeCoCrMnNi and FeCoCrMnNiC0.2 with the required surface quality without defects.
[klicova_slova] => WEDM; wire electrical discharge machining; high entropy alloy; design of experiment; machining parameters
[klicova_slova_orig] => WEDM; wire electrical discharge machining; high entropy alloy; design of experiment; machining parameters
[url] => https://www.mdpi.com/1996-1944/13/21/4823
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[vycet_osob] => MOURALOVÁ, K.; BENEŠ, L.; ZAHRADNÍČEK, R.; BEDNÁŘ, J.; ZÁDĚRA, A.; FRIES, J.; KAŇA, V.
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[citace_text] => MOURALOVÁ, K.; BENEŠ, L.; ZAHRADNÍČEK, R.; BEDNÁŘ, J.; ZÁDĚRA, A.; FRIES, J.; KAŇA, V. WEDM used for machining high entropy alloys. Materials, 2020, vol. 13, no. 21, p. 1-20. ISSN: 1996-1944.
[citace_html] => MOURALOVÁ, K.; BENEŠ, L.; ZAHRADNÍČEK, R.; BEDNÁŘ, J.; ZÁDĚRA, A.; FRIES, J.; KAŇA, V. WEDM used for machining high entropy alloys. Materials, 2020, vol. 13, no. 21, p. 1-20. ISSN: 1996-1944.
[citace_rtf] =>
[citace_bibtex] => @article{BUT165702,
author="Kateřina {Mouralová} and Libor {Beneš} and Radim {Zahradníček} and Josef {Bednář} and Antonín {Záděra} and Jiří {Fries} and Václav {Kaňa}",
title="WEDM used for machining high entropy alloys",
journal="Materials",
year="2020",
volume="13",
number="21",
pages="1--20",
doi="10.3390/ma13214823",
url="https://www.mdpi.com/1996-1944/13/21/4823"
}
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[nazev_en] => WEDM used for machining high entropy alloys
[popis_en] => Unconventional wire electrical discharge machining technology (WEDM) is a key machining process, especially for machining newly emerging materials, as there are almost no restrictions (only at least minimal electrical conductivity) in terms of demands on the mechanical properties of the workpiece or the need to develop new tool geometry. This study is the first to present an analysis of the machinability of newly developed high entropy alloys (HEA), namely FeCoCrMnNi and FeCoCrMnNiC0.2 using WEDM. The aim of this study was to find the optimal setting of machine parameters for the efficient production of parts with the required surface quality without defects. For this reason, an extensive design of experiments consisting of 66 rounds was performed, which took into account the influence of five input factors in the form of pulse off time, gap voltage, discharge current, pulse on time and wire speed on cutting speed and the quality of the machined surface and its subsurface layer. The analysis of topography, morphology, subsurface layers, chemical composition analysis (EDX) and lamella analysis using a transmission electron microscope (TEM) were performed. An optimal setting of the machine parameters was found, which enables machining of FeCoCrMnNi and FeCoCrMnNiC0.2 with the required surface quality without defects.
[klicova_slova_en] => WEDM; wire electrical discharge machining; high entropy alloy; design of experiment; machining parameters
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[nazev] => Analysis of the machinability of the alloyed iron aluminide Fe-Al-Si-Nb by WEDM
[nazev_orig] => Analysis of the machinability of the alloyed iron aluminide Fe-Al-Si-Nb by WEDM
[duvernost_udaju_id] =>
[popis] => Wire electrical discharge machining is an unconventional machining technology used in many industries. The machinability analysis of the newly-created materials is crucial for their future machinability with the given machining technology. For the machinability analysis, the influence of the machining parameters, namely pulse off time, gap voltage, discharge current, pulse on time and wire feed, was investigated in a planned experiment of 33 rounds. Both the cutting speed and roughness were analysed. The surface morphology of the machined pieces was examined with electron microscopy and the subsurface layer with cross-sectioning of the samples. A lamella was made for transmission electron microscopy to perform a detailed analysis of the chemical content. There was no sample made that would not result in cracks of 20-30 mu m depth. These cracks let us assume that the service life of the parts machined in this way will be limited. Multi-criteria optimisation was used to find the optimum machining parameters, which allows the cutting speed to reach 3.2 mm/min and for Ra to reach 2.1 mu m.
[popis_orig] => Wire electrical discharge machining is an unconventional machining technology used in many industries. The machinability analysis of the newly-created materials is crucial for their future machinability with the given machining technology. For the machinability analysis, the influence of the machining parameters, namely pulse off time, gap voltage, discharge current, pulse on time and wire feed, was investigated in a planned experiment of 33 rounds. Both the cutting speed and roughness were analysed. The surface morphology of the machined pieces was examined with electron microscopy and the subsurface layer with cross-sectioning of the samples. A lamella was made for transmission electron microscopy to perform a detailed analysis of the chemical content. There was no sample made that would not result in cracks of 20-30 mu m depth. These cracks let us assume that the service life of the parts machined in this way will be limited. Multi-criteria optimisation was used to find the optimum machining parameters, which allows the cutting speed to reach 3.2 mm/min and for Ra to reach 2.1 mu m.
[klicova_slova] => WEDM, wire electrical discharge machining, iron aluminide alloy, design of experiment, machining parameters
[klicova_slova_orig] => WEDM, wire electrical discharge machining, iron aluminide alloy, design of experiment, machining parameters
[url] => https://journals.sagepub.com/doi/10.1177/09544089241312619
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[citace_html] => MOURALOVÁ, K.; BENES, L.; ZAHRADNÍČEK, R.; BEDNÁŘ, J.; HANUS, P.; FRIES, J.; PODANÝ, K.; KRAUS, P. Analysis of the machinability of the alloyed iron aluminide Fe-Al-Si-Nb by WEDM. Proceedings of the Institution of Mechanical Engineers. Part E, Journal of process mechanical engineering, 2025, no. 2025, 13 p.
[citace_rtf] =>
[citace_bibtex] => @article{BUT200634,
author="Kateřina {Mouralová} and {} and Radim {Zahradníček} and Josef {Bednář} and {} and {} and Kamil {Podaný} and {}",
title="Analysis of the machinability of the alloyed iron aluminide Fe-Al-Si-Nb by WEDM",
journal="Proceedings of the Institution of Mechanical Engineers. Part E, Journal of process mechanical engineering",
year="2025",
number="2025",
pages="13",
doi="10.1177/09544089241312619",
issn="0954-4089",
url="https://journals.sagepub.com/doi/10.1177/09544089241312619"
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[popis] => Nowadays a Stewart platform six DOF parallel mechanism is constructed on FME BUT. The mechanism con-tains two plates linked to each other by six linear actuators. The mechanism control design task has several sub-tasks. One of which is the control design of a linear actuator (single mechanism link). The linear actuator proto-type consists of a DC motor with IRC sensor, ball screw and gearings. A model of the mechanism dynamics was built for the control purposes in state space form. The control is implemented in NI LabVIEW from where it is possible to control the constructed prototype through a real-time computer and a high-level amplifier. A laboratory device for DC motors control, designed in Laboratory of electrical devices UAI FME BUT, is used as a high-level amplifier of a hardware card output. NI LabVIEW environment also contains built-in tools for system simulation and identification which will be used for improvement of the model and control algorithms. The control algorithm will be tested on the experimental DC motor.
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[citace_html] => ANDRŠ, O.; BŘEZINA, L.; HOUŠKA, P. Position control design of a linear mechanical actuator. In Výpočtová mechanika 2008. 1. 2008. p. 3-4. ISBN: 978-80-7043-712-4.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT27457,
author="Ondřej {Andrš} and Lukáš {Březina} and Pavel {Houška}",
title="Position control design of a linear mechanical actuator",
booktitle="Výpočtová mechanika 2008",
year="2008",
series="1",
number="1",
pages="3--4",
isbn="978-80-7043-712-4"
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[popis_en] => Nowadays a Stewart platform six DOF parallel mechanism is constructed on FME BUT. The mechanism con-tains two plates linked to each other by six linear actuators. The mechanism control design task has several sub-tasks. One of which is the control design of a linear actuator (single mechanism link). The linear actuator proto-type consists of a DC motor with IRC sensor, ball screw and gearings. A model of the mechanism dynamics was built for the control purposes in state space form. The control is implemented in NI LabVIEW from where it is possible to control the constructed prototype through a real-time computer and a high-level amplifier. A laboratory device for DC motors control, designed in Laboratory of electrical devices UAI FME BUT, is used as a high-level amplifier of a hardware card output. NI LabVIEW environment also contains built-in tools for system simulation and identification which will be used for improvement of the model and control algorithms. The control algorithm will be tested on the experimental DC motor.
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[nazev_en] => Controller implementation of the Stewart platform linear actuator
[popis_en] => This article presents a simple and efficient approach to the control simulation, implementation and verification of a linear actuator which is a part of a Stewart platform. The proposed method is based on the state - space control with an input integrator. The controller itself combines structures of a position and a velocity control. Switching between the position and the velocity controller is realized according to desired and real position. The whole controller design is based on a linear state-space model of the actuator with the disturbance. The control system itself is implemented in NI LabVIEW software environment from where it is possible to control the constructed prototype through a real-time computer.
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The method used is based on estimation of the legs landing forces vectors and subsequent
evaluation of the legs landing positions through the forward kinematics of the legs with the
knowledge of the particular drives positions of the legs.
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knowledge of the particular drives positions of the legs.
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