Mechanical Project Milling Fixture

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NIE, Praveen, mechanical, engineering, project, work, fixture, milling

Transcript of Mechanical Project Milling Fixture

At: PAMS Engineering, Mysore

"For an optimist the glass is half full, for a pessimist it's half empty, and for an engineer is twice bigger than necessary."

Conceptualize a basic fixture configuration through analyzing all the information. Outputs: Fixture type and complexity Number of workpieces per fixture Orientation of workpieces within fixture Clamping surfaces Locating surfaces

Generation of fixture layout is to represent the fixture concepts in a physical form.

outputs: Position of locators Position of clamps Position of supports, if any Types of clamps Type of locators Type of supports

Fixture element design is to create the solid models in a CAD system of the practical embodiment of the conceptual locators, clamps and supports.Outputs: Detailed design of locators Detailed design of Clamps Detailed design of supports

Tool body design is to produce a rigid structure carrying all the individual fixture elements in their proper places.

Design specifications Factory standards Ease of use and safety Economy

Information gathering and analysis. Consideration of clamping & locating schemes. Design of fixture body.

Principle purpose of a machining fixture is to locate the workpiece surfaces for performing a machining operationSurfaces to be distinguished Active surfaces Supporting & locating surfaces Clamping surfaces Free surfaces

Clamp Device for providing an invariant location with respect to an external loading system.

Requirements of locking elements

To provide a suitable locking for achieving the stability of location. To provide sufficient frictional effects without causing undesirable effect

Easy to manipulate manually or otherwise Quick acting so as to reduce time setting clamping and simultaneous locating Inexpensive

Orientation of locators Clamping force should be directed towards supporting and locating elements on overhanging or thin sections of the workpiece

classification of Clamping Elements Type 1: elements in which the elastic deformation increases with clamping force Ex: screws, levers, cams etc.., Type 2: elements in which the clamping force assumes a constant value independent of the elastic deformation at the contact surface. Ex: Fixtures operated with hydraulic and pneumatic pressure

To provide a suitable locking for achieving the stability of location. To provide sufficient frictional effects without causing undesirable effect