Lathe accessories
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Friends ,here you can grab the stuff on Lathe Accessories,alignment of parts while operating Lathe.

Friends ,here you can grab the stuff on Lathe Accessories,alignment of parts while operating Lathe.

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  • 1. 1 Lathe Accessories Session 7
  • 2. 2 Lathe Accessories • Divided into two categories • Work-holding, -supporting, and –driving devices • Lathe centers, chucks, faceplates • Mandrels, steady and follower rests • Lathe dogs, drive plates • Cutting-tool-holding devices • Straight and offset toolholders • Threading toolholders, boring bars • Turret-type toolposts
  • 3. 3 Lathe Centers • Work to be turned between centers must have center hole drilled in each end • Provides bearing surface • Support during cutting • Most common have solid Morse taper shank 60º centers, steel with carbide tips • Care to adjust and lubricate occasionally
  • 4. 4 Lathe Centers
  • 5. 5 Revolving Tailstock Centers • Replaced solid dead centers for most machining operations • Used to support work held in chuck or when work is being machined between centers • Contains antifriction bearings which allow center to revolve with workpiece • No lubrication required between center and work • Types: revolving dead center, long point center, and changeable point center
  • 6. 6 Revolving Tailstock Centers
  • 7. 7 Microset Adjustable Center • Fits into tailstock spindle • Provides means of aligning lathe centers or producing slight tapers on work machined between centers • Eccentric slide (dovetail) allows center to be adjusted limited amount to each side of center
  • 8. 8 Microset Adjustable Center
  • 9. 9 Self-Driving Live Center • Mounted in headstock spindle • Used when entire length of workpiece is being machined in one operation • Chuck or lathe dog could not be used to drive work • Grooves ground around circumference of lathe center point provide drive • Work usually soft material such as aluminum
  • 10. 10 Self-Driving Live Center
  • 11. 11 Chucks • Used extensively for holding work for lathe machining operations • Work large or unusual shape • Most commonly used lathe chucks • Three-jaw universal • Four-jaw independent • Collet chuck
  • 12. 12 Three-jaw Universal Chuck • Holds round and hexagonal work • Grasps work quickly and accurate within few thousandths/inch • Three jaws move simultaneously when adjusted by chuck wrench • Caused by scroll plate into which all three jaws fit • Two sets of jaw: outside chucking and inside chucking
  • 13. 13 Three-jaw Universal Chuck
  • 14. 14 Four-Jaw Independent Chuck • Used to hold round, square, hexagonal, and irregularly shaped workpieces • Has four jaws • Each can be adjusted independently by chuck wrench • Jaws can be reversed to hold work by inside diameter
  • 15. 15 Four-Jaw Independent Chucks
  • 16. 16 Headstock Spindle Types 1. Threaded spindle nose • Screws on in a clockwise direction 1. Tapered spindle nose • Held by lock nut that tightens on chuck 3. Cam-lock spindle nose • Held by tightening cam-locks using T- wrench • Chuck aligned by taper on spindle nose
  • 17. 17 Threaded Spindle Nose
  • 18. 18 Tapered Spindle Nose
  • 19. 19 Cam Lock Spindle Nose
  • 20. 20 Collet Chucks • Most accurate chuck • Used for high-precision work • Spring collets available to hold round, square, or hexagon-shaped workpieces • Each collet has range of only few thousandths of an inch over or under size stamped on collet
  • 21. 21 Spring Collet Chucks • Spring-collet chuck • One form: Handwheel draws collet into tapered adapter • Another form: Uses chuck wrench to tighten collet on workpiece • Can hold larger work than draw-in type
  • 22. 22 Spring Collet Chucks |
  • 23. 23 Spring Collet Chucks
  • 24. 24 Jacobs Collet Chuck • Jacobs collet chuck • Utilizes impact-tightening handwheel to close collets • Wider range than spring-collet chuck
  • 25. 25 Jacobs Collet Chuck
  • 26. 26 Magnetic Chucks • Used to hold iron or steel parts that are too thin or may be damaged if held in conventional chuck • Fitted to an adapter mounted on headstock spindle • Used only for light cuts and for special grinding applications
  • 27. 27 Magnetic Chucks
  • 28. 28 Faceplates • Used to hold work too large or shaped so it cannot be held in chuck or between centers • Usually equipped with several slots to permit use of bolts to secure work • Angle plate used so axis of workpiece may be aligned with lathe centers • Counterbalance fastened to faceplate when work mounted off center • Prevent imbalance and resultant vibrations
  • 29. 29 Faceplates
  • 30. 30 Faceplates
  • 31. 31 Steadyrest • Used to support long work held in chuck or between lathe centers • Prevent springing • Located on and aligned by ways of the lathe • Positioned at any point along lathe bed • Three jaws tipped with plastic, bronze or rollers may be adjusted to support any work diameter with steadyrest capacity
  • 32. 32 Steadyrest
  • 33. 33 Follower Rest • Mounted on saddle • Travels with carriage to prevent work from springing up and away from cutting tool • Cutting tool generally positioned just ahead of follower rest • Provide smooth bearing surface for two jaws of follower rest
  • 34. 34 Follower Rest
  • 35. 35 Mandrel • Holds internally machined workpiece between centers so further machining operations are concentric with bore • Several types, but most common • Plain mandrel • Expanding mandrel • Gang mandrel • Stub mandrel
  • 36. 36 Plain Mandrel
  • 37. 37 Expanding Mandrel
  • 38. 38 Gang Mandrel
  • 39. 39 Stub Mandrel
  • 40. 40 Lathe Dogs • Drives work machined between centers • Has opening to receive work and setscrew to fasten the dog to work • Tail of dog fits into slot on driveplate and provides drive to workpiece • Made in variety of sizes and types to suit various workpieces
  • 41. 41 Standard bent-tail lathe dog • Most commonly used for round workpieces • Available with square-head setscrews of headless setscrews
  • 42. 42 Standard bent-tail lathe dog • Bent tail engages in slot on drive plate
  • 43. 43 Straight-tail lathe dog • Driven by stud in driveplate • Used in precision turning
  • 44. 44 Safety clamp lathe dog • Used to hold variety of work • Wide range of adjustment
  • 45. 45 Heavy Duty Lathe Dog • Wider range than others • Used on all shapes
  • 46. 46 Cutting-Tool-Holding Devices • Available in three styles • Left-hand offset • Right-hand offset • Straight • Each has square hole to accommodate square toolbit held in place by setscrew • Angle of approximately 15º to 30º to base of toolholder
  • 47. 47 Left-Hand Offset Toolholder • Offset to the right • Designed for machining work close to chuck or faceplate and cutting right to left • Designated by letter L
  • 48. 48 Right-Hand Offset Toolholder • Offset to the left • Designed for machining work close to the tailstock and cutting left to right • Also for facing operations • Designated by letter R
  • 49. 49 Straight Toolholder • General-purpose type • Used for taking cuts in either direction and for general machining operations • Designated by letter S
  • 50. 50 Carbide Toolholder • Has square hole parallel to base of toolholder to accommodate carbide-tipped toolbits • Holds toolbit with little or no back rake • Designated by letter C
  • 51. 51 Cutting-Off (Parting) Tools • Used when work must be grooved or parted off • Long, thin cutting-off blade locked securely in toolholder by either cam lock or locking nut • Three types of parting toolholders • Left-hand • Right-hand • Straight
  • 52. 52 Threading Toolholder • Designed to hold special form-relieved thread-cutting tool • Has accurately ground 60º angle • Maintained throughout life of tool • Only top of cutting surface sharpened when becomes dull
  • 53. 53 Styles of Boring Toolholders • Held in standard toolpost • Light boring toolholder • Used for small holes and light cuts • Medium boring toolholder • Suitable for heavier cuts • May be held at 45º or 90º to axis of bar • Mounted on compound rest of lathe • Heavy-duty boring bar holder • Three bars of different diameters • May be held at 45º or 90º to axis of bar
  • 54. 54 Compound Rest Tooling Systems • Standard, or round, toolpost • Generally supplied with conventional engine lathe • Fits into T-slot of compound rest • Provides means of holding and adjusting type of toolholder or cutting tool required • Concave ring and the wedge or rocker provide for adjustment of cutting-tool height
  • 55. 55 Conventional ToolPosts
  • 56. 56 Modular (Quick-Change) Tooling • Initially developed for CNC machine tools to improve accuracy, reduce tool- change time and increase productivity • Benefits realized on conventional lathes with systems designed for these machines • Modular tooling system must be rigid, accurate and have quick-change capabilities • Basic clamping unit or turret can hold variety of cutting tool modules
  • 57. 57 Modular (Quick-Change) Tooling • Initially developed for CNC machine tools to improve accuracy, reduce tool- change time and increase productivity • Benefits realized on conventional lathes with systems designed for these machines • Modular tooling system must be rigid, accurate and have quick-change capabilities • Basic clamping unit or turret can hold variety of cutting tool modules
  • 58. 58 Modular Tooling System • Principal function is to reduce cost of keeping large tool inventory • Tools can be specifically mounted to suit characteristics of workpiece • More common systems available • The Super Quick-Change Toolpost • The Quadra* Index Toolpost • The Super-Six Index Turret • The Vertical Index Turret
  • 59. 59 Super Quick-Change Toolpost • Provides fast, accurate, and reliable method of quickly changing and setting various toolholders for different operations • Locking system has two sliding gibs forced out against toolholder • Handle pulled into lock position • Provides rigid, positive lock with zero backlash
  • 60. 60 Super Quick-Change Toolpost
  • 61. 61 Quadr* Index Toolpost • Allows four tools to be mounted on turret at same time • Each tool locked independently • Provides flexibility to use from one to four tools simultaneously • Unique indexing system of turret allows it to be set in 24 positions (every 15º)
  • 62. 62 Super-Six Index Turret • Designed to simplify and increase machining productivity on engine lathes when multi-operation jobs require use of more than one tool • Up to six tools for external and internal machining operations • Allows height adjustment for each tool • Tool changes can be made in less than 1 sec
  • 63. 63 Vertical Index Turret (VIT) • Designed to give highest accuracy, fastest tool change and greatest rigidity of any tool system available for engine lathes • Same concept as indexing turrets on CNC lathes • Can hold up to six or eight tools • Closest to performance of CNC lathes