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Economics and Environmental Impact of Materials and Processes
Published in Mahmoud M. Farag, Materials and Process Selection for Engineering Design, 2020
Jigs and fixtures are special production tools that are specially designed for quick and accurate location of the workpiece during manufacture. A fixture is a special work-holding device that holds the workpiece during machining, welding, assembly, etc. It is usually designed to facilitate setup or holding of a particular part or shape. A jig, however, not only holds the workpiece but also guides the tools, as in drill jigs, or accurately locates the parts of the work relative to each other, as in welding jigs. Such production tools are expensive and their cost adds to the total production cost. It is, therefore, important to make sure that they can be justified economically by the saving in production time that will result from their use. The following factors must be considered when considering the economics of special tooling: The cost of the special toolingInterest rate on the cost of the toolingSavings in labor cost as a result of using the toolingSavings in machine cost as a result of increased productivityThe number of units that will be produced using the tooling
Machining of Metals
Published in Sherif D. El Wakil, Processes and Design for Manufacturing, 2019
During conventional drilling operations, the workpiece must be held firmly on the machine table. The type of work-holding device used depends upon the shape and the size of the workpiece, the desired accuracy, and the production rate. For low production when the accuracy is not very important, conventional machine vises or vises with V-blocks (for round work) are used. For moderate production and when accuracy is of some importance, jigs are usually employed. A jig is a work-holding device that is designed to hold a particular workpiece (i.e., it cannot be used for workpieces having different shapes) and to guide the cutting tool during the drilling operation. This eliminates the need for laying out the workpiece prior to machining, thus saving the time spent in bluing and scribing when no jigs are employed. The design of jigs and fixtures is a separate topic and is beyond the scope of this text. Interested readers are referred to the books dealing with tool design and with jig and fixture design that are given at the end of this text.
Continuous Improvement in a Production Line
Published in Abdul Al-Azzawi, Advanced Manufacturing for Optical Fibers and Integrated Photonic Devices, 2017
In workshops and manufacturing lines, a jig is a type of custom-made tool used to hold a work piece and control the location or motion of another tool. The primary purpose of using a jig is to provide repeatability, accuracy, and interchangeability in the manufacturing of a specific product. Jigs are made to increase productivity through consistency, to do repetitive activities, or to do a job more precisely with reduced manufacturing time. There is also the use of a fixture in the production lines. The fixture is used when the work piece is in a fixed position. There is no difference between the two definitions. Some types of jigs are also called templates or guides. A jig is a tool/device that does a specific job in the production lines. For example, jigs include machining jigs, woodworking jigs, welder jigs, jeweler jigs, lighting jigs, etc. Some jigs can be used in other production lines to do multiple jobs. There are many examples, such as positioners, holders, posts, etc.
Influence of micro-electrical discharge machining parameters on the surface morphology of the nickel-coated electrode
Published in Materials and Manufacturing Processes, 2023
M. Siva, N. Arunkumar, M. Subramanian, R. Elakkiyadasan
It is the hollow section in nature which is shown in Fig. 2(a). The length of electrode is 400 mm and Optical Microscope was deployed to find the measurement of the internal diameter and external diameter of electrode, which is clearly mentioned in Fig. 2(b). The internal diameter of tool electrode is approximately 0.17675 mm and the external diameter is 0.4791 mm. This hollow section is typically used to suggest a medium that is dielectric in the machining area to minimize heat generation while removing burrs. To flush the dielectric medium, a tool rotates at a certain RPM. By using a tool holder, a stepper motor is directly connected to the tool electrode. To prevent the electrode from wobbling during the machining process, a jig was required. During the machining process, a jig is typically used to assist and direct the tool electrode.
Task board for the World Robot Summit 2020
Published in Advanced Robotics, 2022
Mizuho Shibata, Hiroki Dobashi, Wataru Uemura, Shinya Kotosaka, Yusuke Maeda, Yasumichi Aiyama, Takeshi Sakaguchi, Yoshihiro Kawai, Akio Noda, Kazuhito Yokoi, Yasuyoshi Yokokohji
Table 8 also shows the numbers of jigs and worktables for temporary placement of assembling parts for the top four teams. A jig is a piece of equipment used to position and orient an assembling part. Note that the jigs in Table 8 do not include equipment to fix the task board, screw feeders, and screw holders. Many teams (3/4) used worktables to temporarily place assembling parts and align their positions and orientations without a jig (Figure 15(a,b,d)). For example, team 2 used their worktable to flip the bearings with housing for regrasping the part in an appropriate configuration toward the assembly task. These worktables functioned as a kind of universal jig and contributed to the realization of the teams' jig-less assembly. One team used jigs specialized to specific parts (Figure 15(c)). In the future, it is expected that the research will progress on the usage of universal jigs and worktables, which promote the jig-less assembly.
An Ontology-based Engineering methodology applied to aerospace Reconfigurable Manufacturing Systems design
Published in International Journal of Production Research, 2023
Rebeca Arista, Fernando Mas, Domingo Morales-Palma, Carpoforo Vallellano
Three types of industrial resources that can be proposed in this activity, considering the aerospace industry characteristics (Arista, Mas, and Vallellano 2020), are: Jigs, Means, and Facilities. Jigs are industrial resources designed specifically for a product family to control product functional and assembly tolerances (e.g. product functional requirements, aerodynamic shape, etc.). Jigs have no universal applicability, should be designed as modular as possible ensuring functional requirements, and should be configurable or convertible for different products of a family. They also should include diagnosis functionalities for quality issues. Jigs can be among others: fixing or positioning elements, test elements, hoisting elements, transportation elements, etc.