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Introduction Manufacturing holding Jigs and Fixtures.pdf
- 1. JIGS AND FIXTURES ME 2123 Manufacturing Systems
- 2. Overview • What are Jigs and Fixtures • Why they are important • Basic jigs and fixtures available • Specific Application
- 4. Jigs • It is a work holding device that holds, supports and locates the work piece and guides the cutting tool for a specific operation. • Jigs are usually fitted with hardened steel bushings for guiding or other cutting tools. • A jig is a type of tool used to control the location and/or motion of another tool. • A jig's primary purpose is to provide repeatability, accuracy, and interchangeability in the manufacturing of products.
- 7. What is a Fixture • It is a work holding device that holds, supports and locates the work piece for a specific operation but does not guide the cutting tool. • It provides only a reference surface or a device. • What makes a fixture unique is that each one is built to fit a particular part or shape. • The main purpose of a fixture is to locate and in some cases hold a work piece during either a machining operation or some other industrial process. • Examples: Vises, chucks
- 9. Summery • The jig is a device that does both functions of holding the work and guiding a tool • The fixture is device used to locating and supporting the workpiece .
- 10. Difference between jigs and fixtures Jigs Fixtures Guide tools through bushes Hold the component being machining with the cutter Used in Drilling, Reaming, Tapping Used in Turning, Milling, Grinding, Shaping, Planning Mostly not clamped to table Connected with machine table Low weight Heavy and mounted rigidly on machine table
- 11. Advantages of Jigs and Fixtures • Improve productivity • Reduce manufacturing cost • Easiness for the operator • Complex and heavy components can be machined easily • High clamping rigidity • Increase machining accuracy • Reduce extra expenditure • Saving labor cost
- 12. Principles of jigs and fixture design • Reduction of idle time • Rigidity • Clearance between jig and component • Locating points and supports • Easy loading and unloading of jig • Clamping • Fool-proofing • Design for safety • Weight of jigs and fixture
- 14. Locating devices cont… Cylindrical locator or locating pins
- 16. Locating devices cont… Cylindrical locator or locating pins
- 19. Clamping Devices cont.. • Hook bolt clamp
- 20. Clamping Devices cont.. • Hook bolt clamp
- 21. Clamping Devices cont.. • Hook bolt clamp
- 22. Clamping Devices cont.. • Bridge clamp
- 23. Clamping Devices cont.. • Bridge clamp
- 24. Clamping Devices cont.. Heel clamp
- 25. Clamping Devices cont.. swinging clamp
- 27. Clamping Devices cont.. Hinged clamp
- 28. Clamping Devices cont.. Cam operated clamp
- 29. Clamping Devices cont.. Quick acting nut operated clamp
- 30. Clamping Devices cont.. wedge clamp
- 31. Clamping Devices cont.. Toggle clamp
- 32. Clamping Devices cont.. Toggle clamp
- 33. Type of jigs Template jig
- 34. Type of jigs cont.. Plate jig
- 35. Type of jigs cont.. Leaf jig
- 36. Type of jigs cont.. Box jig
- 38. Type of Fixtures Turning Fixture
- 39. Type of Fixtures cont.. Milling Fixture
- 40. Type of Fixtures cont.. Broaching Fixture
- 41. Type of Fixtures cont.. Grinding Fixture
- 42. Type of Fixtures cont.. Boring Fixture
- 43. Factors to keep in mind with jigs • Proper clamping of the work • Support of the work while machining • Provision for chip clearance
- 44. Effects of excessive pressure
- 45. Effects of clamping force.
- 46. Support for work during machining
- 47. Provision for chip clearance
- 48. Provision for chip clearance
- 49. Vises
- 50. Bushings