Mumbai University > Mechanical Engineering > Sem 5 > production process 3

Marks: 5M

Year: Dec 2015

Jig

• A jig may be defined as a device which holds and positions the work, locates or guides the cutting tool relatives to the workpiece and usually is not fixed to the machine table.
• It is usually lighter in construction.
• Jigs are used in drilling, reaming, tapping and counterboring operations.
• The below diagram shows a figure.

Fixtures:

• A fixture is a work holding device which holds and positions the work, but doesn’t in itself guide, locate or position the cutting tool.
• The setting of the tool is done by machine adjustment and a setting block or by using slip gauges.
• A fixture is botted or clamped to the machine table. It is usually heavy in construction.
• Fixtures are used in connection with turning milling , grinding, shaping, planning and boring operations.
• The below figure show a fixture: