Workholding Devices

Workholding Devices - Pinch points 30-40 lbs force to...

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Workholding Devices   Chapter 25
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Workholding Devices   Dedicated workholding devices Jigs Fixtures Modular Universal Vises Chucks
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Dedicated Workholding  Devices Jig : A specially designed w/h device that  determines  location   dimensions  that is  produced by machining or fastening  operations. Fixture : A specially designed w/h device that  holds  the work during machining or assembly  operations and establishes  size dimensions . Chucks and vises are often used for  constructing fixtures. 
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Design Criteria   Positive location The workpiece is  located by 3-2-1  principal.
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Design Criteria Repeatability Fool proofing Adequate clamping forces Gravity, cutting, inertial, centrifugal Reliability Ruggedness Loading and unloading operations more abuse  than machining Replacement of parts that wear
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Design Criteria Constructability Use standard elements Low Profile Workpiece Accommodation Ergonomics, Safety
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Unformatted text preview: Pinch points 30-40 lbs force to operate clamp Tool path and operators paths should not cross Design Criteria Part distortion Flexibility Accommodate a family of parts Design Considerations Clamping Spread clamping forces over large area Direct clamping toward work support and locating points Cutting forces toward fixed area of w/h device Perform as many machining operations as possible with each setup. Clamps Clamping Design Considerations Chip Disposal Decrease tool life Interfere with part loading Loading/Unloading Time Minimize Common Types of Jigs Common Types of Jigs Modular Other Workholding Devices Vises Chucks Clamps Assembly jigs Magnetic chucks (grinding) Electrostatic devices (any metal) Vacuum (variable force)...
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This note was uploaded on 05/20/2008 for the course MET 153 taught by Professor Kohser during the Spring '08 term at Missouri S&T.

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Workholding Devices - Pinch points 30-40 lbs force to...

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