The purpose of this study is to diagnose defaults of the TR200-roughness meter by contact measurement using the same path with two opposite directions of the probe left and right. We conducted a series of tests on the same rectified part with a roughness of 0.553 μm using a roughness meter equipped with a TS100 standard probe at a probing path of 8.5 mm, a drive speed of 0.5 mm/s and a feedback speed of 1 mm/s. The originality of this present work focuses on the measurement default diagnosis of the roughness of the surface from the change in direction of the probe after each measure in the same trajectory. This approach validates the unreliability of a roughness meter in the case of parts machined by cutting processes (turning, milling, and grinding). These tests have enabled us to limit the control of the surface state by a TS100 standard probe. For each test, a disagreement was found between the right and left directions by making the calculation of roughness parameters. Estimator fuzzy logic was implemented to solve this problem, obtaining satisfactory results with minus proportional errors between the actual displacement curve and the curve displacement obtained by this system.

Rolling bearings are the most fragile components of rotating machines. To avoid unforeseen stoppages and expensive production, it must then continuously monitor the condition of the bearings, and "stalk" all faults signs: an unusual noise, abnormal vibration, temperature rise, and so on. For this, these are not techniques that are missing. Conventional vibration analysis methods (envelope detection, spectre analysis, crest factor, etc.) to more specific techniques such as shock wave, they can detect faults at an early stage more or less and sometimes to determine the exact origin. In this approach we try to show the influence of operating conditions of a rolling on his life, and to award the method of real service to follow for assessing the remaining duration of survival for many supply and provide the judgments of each rotating machine in advance.

The aim of this paper is the determination of a control model of involute gears with respect to θm, based on the application of neural networks. Neural networks are appropriate for the diagnosis of complex systems and control because of its ability to handle data input and output without the need for analytical details of the system. First, we must know the angle to wipe the edge of a tooth surface, with. We acquire the points entered in standard path of the tooth. Then we execute the neurons on these points to determine the weights is the step that is called learning networks. That last request 94.41s. So it becomes all models of the gear standard with the same characteristics. So, if we wanted a control gear of the same module, it will be only a few points seized by CMMs. On the other hand, is looking for the model of the wheel to control the proper starting weight calculated from previous models. His duration of control esteem 1.6 s. Moreover, we can evaluate the deformities of gear compared to model neurons and the points entered. Finally, the role of this work is the set of model control equipment; we know it contains multiple paths and multivariate parametric complex. So, it's not easy have the control. However, ours, we can know all the deformities of the gears in about 1.60s instead of 45 min at least by the test bench, accordingly, we can say that we achieve the automation of gear control.

Generally, gear pumps are classified as noise producing machines. With a view of reducing overall radiated noise level from gear pumps, without affecting the mechanical efficiency, an experimental investigation was carried out. In this study the possibility of utilizing a plastic gear instead of the conventional one was exanimate. On the rig built up for this purpose, two different kinds of tests were made. The first part of the experiment was devoted to measurements related to mechanical performances and the radiated noise level from a conventional pump with a metal gear mesh, under different operating conditions. The second series of tests was carried out mainly to know the effect due to the replacement of the idler metal gear with the plastic one. This test also was performed under various operating conditions. Serious difficulties were encountered with the plastic gear testing. On several occasions the plastic gear was destroyed. The debris from the plastic gear gave considerable trouble in some elements of the hydraulic circuit. In the plastic gear case, significant flow was observed. The results of the performance test on the plastic gear seem to be disappointing. Even though the plastic gear has good damping vibrations, there is no significant reduction in the overall radiated noise level from the gear pump. At low speeds, the plastic gear gave a lower performance rate compared to the conventional gear pump. However, at higher speeds, the performances were nearly the same. Further, the plastic gear seems to be unable to withstand a high level of loading. This can cause damages in the plastic gears and reduce the life period.

This paper presents and describes the design, manufacturing, calibration and performance of a universal cutting dynamometer based on the principle of extensometer strain gage techniques.The device developed in this paper was designed and calibrated for measuring separately components forces developed during turning, drilling and milling operations.Its design is carried out according to the two principal criteria which are in contradictory matters such as sensitivity and rigidity.It consists principally of two circular rings, one allowing its fixation on the tables of the three type of machine tools, and the other one is machined so that the complete dynamometer can be attached to machines tables.The strain gages are then cemented on the parts of the dynamometer where the deformations (traction, compression and torsion) are maximum.The gages are connected in the form of a full wheatstone bridge, any unbalance in which would indicate the thrust force ant the torque providing maximum sensitivity and complete temperature compensation.The disposition and the connection of the strain gages in complete Wheastone bridge are carried out according to the force component to measure while taking account of the interactions between the three directions and the compensation of the effect of the temperature.The reading is indicated on standard indicator of constraints B & K 1526.Some experimental measurements of components forces and torque in the drilling process obtained with the described dynamometer are presented and compared with available data given by other research worker.

Three dimensional coordinate metrology is a firmly established technique in industry. Scanning technology is now widely used in coordinate metrology and is increasingly used for the measurement of small features. This paper presents a new real shape approach to closest point inspection involutes curve of gear tooth by coordinate measuring machinery (CMM). This method aims to select the most likely contact point for each successive arc by applying geometrical criteria and a fuzzy logic estimator. This method is particularly, but not exclusively, suitable for the metrology of features with small radii as well as metrological discontinuities. It does not require obtaining the normal vector traditionally used for probe tip correction. Elapsed time is 144.09 s. Tests have been done on limps of machine tool speed (pinion type cutter), which is highly applied in our country.

Dynamic behavior of machine-tools while cutting is influenced mainly by both dynamic properties of its mechanical structure defined by its function of transfer Tm and the nature of its solicitation characterized by the cutting process function of transfer Tu. Good working of such machine-tool is essentially based on dynamic behavior of this too functions of transfer which of the dynamic state of the structure. The aim of this work is to study the influence of the continuous variation of cutting speed on the cutting dynamic behavior. This study allows us to draw some stability lobes which show clearly the influence of the cutting speed on the amplitude of chatter vibration. The obtained results are in good agreement with those obtained experimentally in the laboratory of Metrology in the «'Ecole Nationale des Arts et Métiers ».