Production and Tooling Design | Box Jig | Engr. Awais Ahmad |

1/21/2013 |

Submitted by:
Saba Noor (2009-IME-108)
Misbah Niamat (2009-IME-116)
Asma Aslam (2009-IME-127)

Contents: * What are Jigs and Fixtures? * Why Jigs and Fixtures are used? * Elements of Jigs and Fixtures * Important Considerations while designing a Jig * Box Type Jig * Designing a Box Type Jig * Benefits of Jigs * Drawbacks of Jigs * Conclusion

What are Jigs and Fixtures? * Anything used to hold a work piece in a desired location * Locate parts for precision * Repeating process on a series of parts * Holding parts for machining, painting, assembly
Why Jigs and Fixtures are used?
Holding cylindrical parts to be drilled is one of major problems faced by the manufacturing company, especially small medium company. Sometimes they need expensive equipment to holds the parts to be drill. Today, customers request in industries is increasing. So, the company must find new methods to improve their productivity. Jigs are important part using in any industry. Before this, jigs always have limited function like just one part can be support for one process. This makes the production process slow and cannot fulfill the customers demand. Now days, there are several methods available to improve design to increase the productivity. Jigs are simplified locating and clamping of the work-piece. Tool guiding elements to ensure correct positioning of the tools with respect to the work-piece. Elements of Jigs and Fixtures: * Sufficiently rigid bodies (plate, box or frame structure) * Locating elements. * Clamping elements. * Tool guiding elements. * Elements for positioning or fastening the jig and fixture.

Important Considerations while Designing a jig: Designing of jigs and fixtures depends upon so many factors. These factors are analyzed to get design inputs for jigs and fixtures. The list of such factors is mentioned below: a. Study of work piece and finished component size and geometry. b. Type and capacity of the machine, its extent of automation. c. Provision of locating devices in the machine. d. Available clamping arrangements in the machine. e. Available indexing devices, their accuracy. f. Evaluation of variability in the performance results of the machine. g. Rigidity and of the machine tool under consideration. h. Study of ejecting devices, safety devices, etc. i. Required level of the accuracy in the work and quality to be produced. Box Type Jig Its construction is like a box and it is used for the components having irregular shape and to be operated at different places. This type of jig provides rigid support, so machining on the various places of work piece becomes comfortable. This is because box jigs also offer good support to frail work pieces and excellent tolerance control.

Designing a Box Type Jig: Once a box jig has been selected as the most logical tool to use for a machining operation, we must gather and evaluate all the data concerning the part. Referring to the part, the following information and design data are extracted: • The part is 70 millimeters long, 50 millimeters wide and 30 millimeters thick. Other Design Considerations:

BENIFITS OF JIGS: * Reduce cost of production. * Increase the production. * To assure high accuracy of parts * Provide for interchangeability * Enable heavy and complex parts to machine * Reduced quality control expenses. * Increased versatility of machine tool. * Less skilled labor. * Saving labor. * Partially automates the machine tools * Use improve the safety, accidents low Drawbacks of Jigs:
In industry, using jigs is very important in operation. Nowadays, tools are more important than workman skill. This will make the industrial lacking skillful man in workplace. When the tools are breakdown, the production rate will be decrease. Cost for maintenance will be higher.