26 research outputs found
The possibility of using a mathematical model based on consecutive first-order reactions to describe the Cr(III) ions pertraction in DCSLM system
Achievable tolerances in robotic feature machining operations using a low-cost hexapod
Portable robotic machine tools potentially allow feature machining processes to be brought to large parts in various industries, creating an opportunity for capital expenditure and operating cost reduction. However, robots lack the machining capability of conventional equipment, which ultimately results in dimensional errors in parts. This work showcases a low-cost hexapod-based robotic machine tool and presents experimental research conducted to investigate how the widely researched robotic machining challenges, e.g. structural dynamics and kinematics, translate to achievable tolerance ranges in real-world production to highlight currently feasible applications and provide a context for considering technology improvements. Machining trials assess the total dimensional errors in the final part over multiple geometries. A key finding is error variation which is in the sub-millimetre range, although, in some cases, upper tolerance limits < 100 μm are achieved. Practical challenges are also noted. Most significantly, it is demonstrated that dimensional machining error is mainly systematic in nature and therefore that the total error can be dramatically reduced with in situ measurement and compensation. Potential is therefore found to achieve a flexible, high-performance robotic machining capability despite complex and diverse underlying scientific challenges. Overall, the work presented highlights achievable tolerances in low-cost robotic machining and opportunities for improvement, also providing a practical benchmark useful for process selection
Thiacalixarene derivatives incorporated in optical sensing membranes for metal ion recognition.
International audienc
Evaluation of an azocalix[4]arene derivative for the selective extraction of Pd(II) from hydrochloric acid solutions
International audienc
Instabilité des fraiseuses opérant à haute vitesse, provoquée par l'intéraction des défauts de roulements avec les résonances
Identification aveugle paramétrique de la fonction de réponse impulsionnelle basée sur la cyclostationnarité de second ordre à partir des réponses seulement
International audienc