SOLUTION

Production devices are generally working holders with/without tool guiding/setting arrangement. These are called jigs and fixtures.

Jigs are provided with tool guiding elements such as drill bushes. These direct the tool to the correct position on the workpiece. Jigs are rarely clamped on the machine table because it is necessary to move the jig on the table to align the various bushes in the jig with the machine spindle.

Fixtures hold the workpiece securely in the correct position with respect to the machine /cutter during operation. There is sometimes a provision in the fixture for setting the tool with respect to the workpiece/fixture, but the tool is not guided as in a jig. Fixtures are often Camped to the machine table.

Elements of Jigs and Fixtures

Generally, all the jigs and fixtures consist of:

1. Locating Elements:- These positions Me workpiece accurately wig respect to We tool guiding or setting elements in the fixture.
2. Clamping Elements:- These hold the workpiece securely in the located position during operation
3. Tool Guiding and Setting Elements:- These aid in guiding or setting of the tools incorrect position wig respect to the workpiece. Drill bushes guide the drills accurately to the die workpiece. Milling fixtures use sewing pieces for correct positioning of milling cutters with wide respect to the workpiece.

Advantages of Jigs and Fixtures

1. Productivity:- Jigs and fixtures eliminate individual marking, positioning, and frequent checking. 1 his reduces operation time and increases productivity.
2. Interchangeability:- Jigs and fixtures facilitate uniform quality in manufacture. There is no need for selective assembly. Any part of the machine would fit properly in assembly, and all similar components are interchangeable.
3. Skill Reduction:- Jigs and fixtures simplify locating and clamping of the workpieces. Tool guiding elements ensure the correct positioning of the tools with respect to the workpieces. There is no need for the skillful setting of the workpiece or tool. Any average person can be trained to use jigs and fixtures. The replacement of a skilled workman with unskilled labor can affect a substantial saving in labor costs.
4. Cost Reduction Higher production, reduction in scrap, easy assembly, and savings in labor costs result in a substantial reduction in the cost of workpieces produced with jigs and fixtures.