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AUTOMATIC & COPYING
LATHES
Applications of Automation
Manufacturing processes
Material handling
Inspection
Assembly
Packaging
Advantages of Automation
Reduce human involvement
Reduce work piece damage
Less wastage
Raise the level of safety
Increase productivity
Decrease unit cost
Improve accuracy
More resource utilization
Definition of automation
Automation is the use of machines and technology to make process run on their own without
man power.
OR
Automation is the creation and application of technology to monitor and control the
production and delivery of products and services.
Principle of automatic control
controller, amplifier, actuator, and feedback.
Open loop & Closed loop control system
Automatic Control Systems

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Automatic & Copying Lathes.pptx

  • 2. Applications of Automation Manufacturing processes Material handling Inspection Assembly Packaging
  • 3. Advantages of Automation Reduce human involvement Reduce work piece damage Less wastage Raise the level of safety Increase productivity Decrease unit cost Improve accuracy More resource utilization
  • 4. Definition of automation Automation is the use of machines and technology to make process run on their own without man power. OR Automation is the creation and application of technology to monitor and control the production and delivery of products and services.
  • 5. Principle of automatic control controller, amplifier, actuator, and feedback. Open loop & Closed loop control system
  • 7. Automatic and Semi Automatic Lathes Developed from turret lathe
  • 8. Difference b/w Automatic and Semi Automatic Lathes Initial machine set up Machining operations Loading of workpiece and unloading of finished products
  • 9. Classification According to number of spindles Single Spindle and Multi Spindle Lathes According Purpose General Purpose and Single Purpose Lathes According to Type of Blank Bar Type and Chucking Types Lathes According to Arrangement of Spindle Horizontal Type and Vertical Type
  • 10. Single Spindle Lathes Single piece of bar stock is fed Regular shaped bar stocks are processed Spring collet chuck is used Friction clutch actuates the collet chuck
  • 12. Single Spindle Automatic Machine This machine has been developed for manufacturing quantities of small precision components, and is often referred to as Swiss Auto. This machine is best suited where work is long and slender and where accuracy, finish and concentricity are important. Fig. 34.2 shows the general layout of sliding head type single spindle automatic machine. The bar stock is fed through a sliding headstock and held by a collet chuck. It has a sliding headstock which is traversed by a bell or plate type cam. A tool bracket, supporting five tool slides, each slide, operated by a separate cam, is mounted in the centre. Tool bracket also contains a guide or steady bush for the bar stock. Cams are held on a front cam shaft. These control the tool slides and headstock movements. In place of turret slide is mounted a feed base having single or multi-spindle for operations like drilling, reaming, screwing, tapping, etc. The main drive is from an electric motor at the bottom left hand of the machine which drives a gear box housed in the cabinet base. From gear box the drive is transmitted to the spindle by two roller chains which pass up through the base of bed. Thus the spindle speed can be varied from 60 to 200 R.P.M. in steps. For turning operations the reverse direction of spindle is employed by use of left hand chain and the slow speed for purpose of screwing and remaining operations is obtained by using right hand chain drive. pindle reversal is effected by the operation of the clutch on the spindle and for both the left hand and right hand chains, fast and slow speed are possible through clutches in the gear box. Thus two forward and two reverse speeds are possible for each combination of pick- off gears. The operation of these and the spindle clutch takes place from the back shaft and thus the speeds could be changed or reversed automatically also. The spindle is mounted in preloaded radial roller bearings which prevent excessive clearance in the spindle over a prolonged period of operation.
  • 13. Types of Single Spindle Automatic Machines 1. Automatic Cutting-off Machines 2. Automatic Screw Machine 3. Swiss Type Automatic Screw Machine
  • 14. Automatic Cutting-off Machines These machines produce short w/p’s of simple form by means of cross sliding tools. Machines are simple in design. Head stock with spindle is mounted on bed. 2 cross slides are located on bed at front end of spindle. Cams on cam shaft actuate movements of cross slide through system of levers.
  • 15. Automatic Cutting-off Machines Operation: • The reqd length of work(stock) is fed out with a cam mechanism, up to stock stop which is automatically advanced in line with spindle axis at each end of cycle. • Stock is held in collet chuck of rotating spindle. • Machining is done by tools that are held in slides operating only in cross wise direction. • Typical simple parts (3 to 20 mm dia) machined on such a machine is shown in fig.
  • 17. Bar & Tool Feed Mechanism
  • 18. Single Spindle Automatic Screw Machine
  • 19. Single Spindle Automatic Screw Machine
  • 20. Single Spindle Automatic Screw Machine Bolts & Screws from bar stock Complex shapes can also made Cam controlled mechanism is used for clamping, releasing and feeding bar stock.
  • 21. Swiss Type Automatic Screw Machine
  • 22. Swiss Type Automatic Screw Machine Head stock is movable Tools are fixed Sliding head type Mass production of small diameter parts Precision works – watches, instruments, radio parts etc.
  • 23. Swiss Type Automatic Screw Machine
  • 25. Tool Layout – Six Spindle Automatic Lathe
  • 26. Difference b/w Single Spindle & Multi Spindle Lathes  Productivity Energy Efficiency Space Savings
  • 27. Copying Machines Mechanical Type (Pantograph Copying Machine) Hydraulic Servo Copying System Electric Copying System
  • 30. Pantograph Copying System  Copy form of involute gear tooth space to grinding wheel of a gear tooth grinding machine Follower, fulcrum and tracer must lie in straight line