Page 131 - CITS - Fitter - Trade Theory

FITTER - CITS

Characteristic Jig Fixture

Holds and secures the workpiece in
Purpose Guides and directs the cutting tool
position

Function Guides the tool and locates the workpiece Holds and positions the workpiece

Milling, grinding, turning, or other
Primary Use Drilling, reaming, or tapping operations
operations
Weight and Lighter construction, often made from Heavier construction, commonly steel or
Construction aluminium iron
Rigidly bolted or clamped to the machine
Clamping Usually not clamped to the machine table
table

Load-Bearing Experiences minimal cutting loads Supports heavy cutting forces

Clamps, supports, and locates work
Key Features Guide bushings, drill templates, and bushings
pieces
Typical Operations Hole-making, precision drilling Workpiece shaping, material removal

Machining Speed Typically used for high-speed drilling Suitable for various machining speeds

Milling fixtures, grinding fixtures, turning
Examples Drill jigs, reaming jigs, tapping jigs
fixtures

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CITS : CG & M - Fitter - Lesson 20