1. Government Tool Room & Training Centre, Chikodi
Diploma in Tool and Die Making
“Jigs and Fixture”
4th semester
1
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Unit-02 Locations

2. 2
UNIT-2 LOCATIONS
• Locating the workpiece is the first basic function
• A locator is usually a fixed component of a fixture.
• Locating pins are harderened parts
https://www.youtube.com/watch?v=X5tiaVH-
D1Y&ab_channel=CarrLaneMfg
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Degrees of freedom of a work piece
3-2-1 PRINCIPLE WITH DOF
Six rectilinear
Six angular
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Elements of jigs & fixture
Locating Elements These position the work piece accurately
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Elements of jigs & fixture
Locating Elements These position the work piece accurately
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Types of locators
Plane surface Profile surface
Cylindrical surface
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Diamond locator
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Redundant locators
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It should be avoided
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Nest & cavity locator Nesting locator completely locates the outside
surface of a work piece.
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Classification of V locators:
1. Fixed V locator
2. Inclined V locator
3. Screw nut adjustable V locator
4. Spring actuated V locator
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Fool proofing
Wrong loading can be prevented by providing
a fool proofing pin.
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