Introduction Manufacturing holding Jigs and Fixtures.pdf

Jigs and Fixtures

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

3. Jigs
•https://www.youtube.com/watch?v=rTGb9
RZIB1I

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 bushesHold the component being
machining with the cutter
Used in Drilling, Reaming,
Tapping
Used in Turning, Milling,
Grinding, Shaping, Planning
Mostlynot clamped to tableConnected withmachine 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

13. Locating devices
Locating pins

14. Locating devices cont…
Cylindrical locator or locating pins

16. Locating devices cont…
Cylindrical locator or locating pins

17. Clamping Devices
Clamping screw

18. Clamping Devices
Clamping screw

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

51. Modular Fixturing