Intro and Work Holding Devices

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PR 305 – TOOLING FOR MANUFACTURING

-DINESH KUMAR . R ADHOC FACULTY DEPT. OF PRODUCTION ENGG NIT-TRICHY

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Unit-3DESIGN OF FIXTURES

• Work Holding Devices• Principles of location and

Clamping• Clamping Methods and elements• Design of Fixtures

• Milling, Turning , Grinding, Welding, Inspection and design of gauges

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Work Holding Devices

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Holding Devices

• Two categories1. Tool-holding devices

• Used to hold or drive cutting tool

2. Work-holding devices• Used to clamp or hold workpiece

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Work-Holding Devices

• Angle vise• Angular adjustment on base to allow

operator to drill holes at an angle without tilting table

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• Drill Press Vise• Used to hold round, square or odd-shaped

rectangular pieces• Clamp vise to table for stability

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• Drill Press Vise

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• V-blocks• Made of cast iron or

hardened steel• Used in pairs to

support round work for drilling

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• Step blocks• Used to provide support for outer

end of strap clamps • Various sizes and steps

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• Angle plate• L-shaped piece of

cast iron or hardened steel machined to accurate 90º

• May be bolted or clamped to table

• Variety of sizes

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• Drill jigs• Used in production for drilling holes in large

number of identical parts• Eliminate need for laying out a hole location

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• Clamps or straps• Used to fasten work to table or

angle plate for drilling• Various sizes• Usually supported at

end by step block andbolted to table by T-boltthat fits into table T-slot

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Finger clamp

U-clamp

Straight clamp

Intro and Work Holding Devices

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