321 principle fixture design pdf

Design and fabrication of combination fixture for reducing production time in pump manufacturing. The 321 principle one of the methods how the parts degree of freedoms are arrested. This book is suitable to the engineering students of b. Fixture designplanning in practice 2 the 3 in 321 refers to 3 locators passive fixture elements on the primary locatingdatum. Design, development and analysis of hydraulic fixture for. Once located, the workpiece must also be held to prevent movement during the operational cycle. With this method, six individual locators reference. An automated fixturedesign system requires an intelligent feature recognizer, a sophisticated design system, a good knowledgerepresentation scheme, and sound interfacing of these modules.

Except toggle clamp, no other option is available to hold cylindrical object, hence special type of fixture is design for this case, which can be used for machining of hydraulic lift housing, fixture reduces operation time, increases productivity, and best quality of operation is possible. Universal design principles universal design is the design of products and environments to be usable by all people, to the greatest extent possible, without the need of adaptation or specialized design. Purposes of jigs and fixtures and their design principles nptel. Environmental protection agency off iice of water program ti operons a office of research and development municipal envi ronmental research laboratory. The 321 method is the fundamental principle for all types of fixture design. Phase i 2 actual practical development at tinker will be drawn. Among those geometry a broad, very short hollow casmethod 321 principle and it is very useful for the complex fixture design though. Determining the positions of the elements for the 321 principle of.

Flexible fixture automotive part passive pinarray fixed jaw mobile jaw pins workpiece. How is the 321 location principle used for designing of. Fixtures are custom workholding devices used in many manufacturing operations to secure, support, and locate a workpiece. A fixture is a work holding device which holds and positions the workplace, but does not guide or locate. Fixtures are created through combining fixture bodies, supports, locators, and clamps.

According to the international code council one and twofamily dwelling code, the purpose of building codes is to provide minimum standards for the protection of life, limb, property, environment, and for the safety and welfare of the consumer, general public, and the. It is essential to find out deformation of workpiece under various loads is a challenging task. Provide a support at one point of the adjacent surface yz that will fix other remaining free movements. Form follows function is a principle associated with modern architecture and industrial design in the 20th century. The new fixture design reduces cycle time and operator labor while increasing functionality. Sep 15, 2015 the jig and fixture design follows the manual,pneumatic, hydraulic, servo sequentially preferred principles. Apr 03, 2019 design and fabrication of combination fixture for reducing production time in pump manufacturing d. Design and fabrication of combination fixture for reducing.

Design and fabrication of lathe fixture for brake drum cargo. The effective reflectances of the above three surfaces affect the quantity of reflected light received by the working plane. The 321 principle of jig fixture design learn the basic concepts. Fixture design basics 201 fixture design basics describes the components and purposes of fixtures and the fundamental concepts related to creating efficient fixtures. In 321 principle, the primary usually a plane locks 3 degree of freedom, 2 rotati. Fixtures are essential elements of production processes as they are required in most of the automated manufacturing, inspection, and assembly operations. The mostcommon way to locate a workpiece from its external profile is the 321, or sixpoint, locational method. Introduction a fixture is a device for locating, holding and supporting a workpiece during a manufacturing operation. Learn how to use the 321 principle for designing of drilling and milling fixture. Formed serialization and standardization within the.

Using this, a formal generalization of the concepts and methodologies of fixture design for tinker will be developed. Specific constraints for each shop will again be identified. Pdf development of cad software for jig and fixture for. These factors are analysed to get design inputs for jigs and fixtures. The process of holding the position of the workpiece in the jig or fixture is called clamping. Formed serialization and standardization within the company product. Room reflectance the room is considered to consist of three main surfaces.

Design principle of jig and fixture linkedin slideshare. I am uploading a series of lectures on design of work holding fixtures. The jig and fixture are tools used for holding the work piece in a correct location for mass production. A vasudevan 3 1,2,3 department of mechanical engineering, easa college of engineering and technology, coimbatore 641105, tamil nadu, india. February 26, 2008 29 milling fixtures the design should permit as many surfaces of the part to be machined as. Universal design is relevant to a wide range of design disciplines including the design of environments, products and communications. For example, a cnc machine tool starts its process at a specific point relative to the fixture and proceeds from there. Boring fixture may have characteristics of a drill jig or a mill fixture. The 321 principle of jig fixture design learn the basic.

Fixture design plays an important role at the setup planning phase. A fundamental concern in metalworking is locating the part to be machined, punched, bent, or stamped relative to the work platform fixture. However, as the work piece size, shape, or complexity becomes more sophisticated, so too must the fixture. Feb 04, 2018 i am uploading a series of lectures on design of work holding fixtures. The optimum fixture layout deformation at initial load step is 0. Protection against injury a major provision for safe housing construction is developing and implementing building codes. In the case of hydraulic or pneumatic fixtures, inherent design advantages can dramatically improve productivity and, hence, reduce perunit costs even further, even though the initial cost to construct these fixtures is the most expensive of all fixture alternatives. The secondary locks another 2 degrees of freedom, 1 translation and one rotation. The concept design of checking fixtures for autobody parts is a highly complex process that requires a human designer to draw from his rich experience. The simplest type of milling fixture is a milling vise mounted on the machine table.

Provides a full understanding of the design and application of fixture tools and checking fixtures, welding fixtures and procedures, threedimensional space in checking compound warped surfaces, measurement systems, and the simple mathematics required. Many dedicated fixtures for prismatic parts are designed using the 321 locating principle. The 321 locator principle li and melkote 2001 is used in fixture design, as it provides the maximum rigidity with the minimum number of fixture elements. Locating principles and devices cont to restrict the movement of the part around the zzaxis and in direction eight, two more pintype locators are positioned in a vertical plane. Sometimes called scale, this principle refers to the size of elements in a design.

By exploiting recent advances in cadcam and artificial intelligence techniques, one may constrain multiple solutions such that only good designs are considered. An automated fixture design system requires an intelligent feature recognizer, a sophisticated design system, a good knowledgerepresentation scheme, and sound interfacing of these modules. A fixture is a device used to fix constrain all degrees of freedom a workpiece in a given coordinate system relative to the cutting tool. For a machining work, like drilling a through hole of given. Concept design of checking fixture for autobody parts. Henriksen, jig and fixture design manual, industrial pres inc. Site has informationeducation resources on a broad range of topics, including asthma, birth defects, radiation, sanitation, lead in blood, and more.

Various types of fixtures like drilling fixtures, milling fixtures, and welding fixtures are used in industry. The 3 in 321 refers to 3 locators passive fixture elements on the primary locatingdatum surface. The principle of location is being discussed here with the help of a most popular. A fixture is a special workholding device that holds work during machining or assembly operations and establishes size dimensions general purpose clamps and chucks are not fixtures or jigs. A work piece can be positively located by means of 6 pins so positioned that collectively they restrict the work piece in nine of its degree of freedom. Pdf in machining fixtures, minimizing workpiece deformation due to. It is essential to find out deformation of workpiece under various loads is. Explain the 321 principle of location, mechanical engineering.

Jig is a fixture with an additional feature of tool guidance. Proper fixture design is crucial for developing product quality in different terms of accuracy, surface finish and precision of the machined part. In his research 321 locating principle was used and clamping force has been optimized. Design supplementary planning document spd design principles 4a. Participants will be introduced on various types of jigs and fixtures design, performing engineering calculations and required tolerances analysis, inspection and testing process, and documenting the design for final fabrication process. This is achieved by providing six locating points, 3 pins in base plate, 2 pins in vertical plane and 1 pin in a plane which is perpendicular to first two planes. Society cares about the way things look, and there is a constant need to produce highquality design. Here are eight basic design principles to keep in mind when creating great looking graphics. Rigidity jigs and fixtures should be sufficiently stiff to secure the preset accuracy of machining. Fixture design basics describes the components and purposes of fixtures and the fundamental concepts related to creating efficient fixtures. The principle is that the shape of a building or object should be primarily based upon its intended function or purpose.

In addition to a hardcopy fixture design manual, a procedural cdromwebpage for fixture design principles for manufacturing of. Only one direction of each degree of freedom is located 4. This principle of location of fixing points on the workpiece is also named as 321 principle of fixture design as number of points selected at different faces of the workpiece are 3, 2 and 1 respectively. Overview written for the experienced engineer as well as the student, this comprehensive reference presents the fundamental aspects of jig and fixture design in a readable manner. Unit 4 design of fixture design of fixture structure 4. These include a commitment to achieving a high quality development. International journal of engineering research and general. This article will explain about 321 principle of jig fixture design. Nceh provides leadership to promote health and quality of life by preventing or controlling those diseases, birth defects, or disabilities resulting from interaction between people and the environment. Locating the workpiece is the first basic function of a jig or fixture. In 321 principle, the primary usually a plane locks 3 degree of freedom, 2 rotations and 1 translation respectively. Day 1 the principle of tool design the objective of tool design. Hence, a stepbystep procedure for jig and fixture design will be developed.