The jigs and fixtures are the economical means to produce repetitive type of work by incorporating special work holding and tool guiding devices. The following are the advantages of employing jigs and fixtures in mass production work.
2. It increases the machining accuracy, because the workpiece is automatically located and the tool is guided without making any manual adjustment.
3. It enables production of identical parts which are interchangeable. This facilitates the assembly operation.
4. It increases the production capacity by enabling a number of workpieces to be machined in the single set up, and in some cases a number of tools may be made to operate simultaneously. The handling time is also greatly reduced due to quick setting and locating of the work. The speed, feed and depth of cut for machining can be increased due to high clamping rigidity of jigs and fixtures.
5. It reduces the operator’s labour and consequent fatigue as the handling operations are minimized and simplified.
6. It reaches semi-skilled operator to perform the operations as the setting operations of the tool and the work are mechanized. This saves labour cost.
7. It reduces the expenditure on the quality control of the finished products
8. It reduces the overall cost of machining by fully, or partly automatising the processes.
1. A fixture holds and position the work but does not guide the tool, whereas a jig holds, locates and as well as guides the tool.
2. The fixtures are generally heavier in construction and are bolted rigidly on the machine table, whereas the jigs are made lighter for quicker handling, and clamping with the table is often unnecessary. -
3. The fixtures are employed for holding work in milling grinding, planning, or turning operations, whereas the jigs are used for holding the work and guiding the tool particularly in drilling, reaming or taping operations.