Design and fabrication of work holding device for a drilling machine

Abstract

The target of the mass production is to increase the productivity and increase the accuracy. This is done by reducing the set up cost and manual fatigue. Thus mass production can be achieved by the use of jigs. For large scale production of different materials a lot of time is wasted in set up of the device and clamping the device. Trial and error method is usually practiced until the axis of the hole is properly aligned with the axis of the drill. In such a situation a lot of time is being wasted to maintain the accuracy. Eventually it increases the operator’s fatigue. Thus drill jig increases productivity by eliminating individual positioning, marking and frequent checking. The main advantage of the jigs is interchangeability. A fixture is a production tool. The main aim is to locate, hold and support the work securely so that the required machining operations can be performed. Set blocks and feeler or thickness gauges are also used to provide reference of the cutter with the workpiece. A fixture must be easily fastened with the table and the machine. As a result the work can be done. Fixture is largely used in milling machines. But it can also be used for other operations on most of the standard machining tools like drilling machine. Fixtures are available in different shape and sizes ranging from simple and cheap devices to very expensive and complicated devices. Fixtures can also help to simplify the metalworking operations which are performed on the special equipment. Considering the advantages of jigs and fixtures, a fixture was designed to cater to our needs.