1. Mechanical Engineering Department CAD/CAM
4th year Prod. & 2nd Mech.

2. Lecturer Dr. Sherif Elatriby Assistant Prof. in
Mech. Engineering Dept.
Helwan Univ.
Mob
FB. Sherif A. Elatriby

3. Course Contents Introduction NC System Tooling for CNC CAD/CAM
NC Part Programming (G-Code)
Repetitive machining sequences
Automatically Programmed Tool (APT)
Tooling for CNC
CAD/CAM

4. Course Evaluation Prod. (300)
Final Exam
Practical Exam
Midterm+Quiz+Attendance+Reports

5. Course Evaluation Mecha. (200)
Final Exam
Practical Exam
Midterm+Quiz+Attendance+Reports

6. Today lecture Introduction What is machining What are machining types
What are machine types
What is numerical control
Part selection for NC Machine
Planning for use NC
Advantages of NC

7. What is machining
Production process in which the excess metal is removed in form of deposal chip
Production Process
Added Material
Weld
Assembly
Same Material
Casting
Forming
Subtract Material
Machining

8. Questions???!
Name the following machine C A B

9. What is machining
Tool
Chip WP

10. What is machining
Milling Parameters

11. What is machining
Turning Parameters

12. What is machining
Drilling Parameters

13. What are machining types
Main machining types
milling
turning
drilling

14. What are machining types
Milling

15. What are machining types
Milling
(Video deleted )

16. What are machining types
Turning

17. What are machining types
Turning
(Video deleted )

18. What are machining types
Drilling

19. What are machining types
Drilling
(Video deleted )

20. What is the difference???
CAD NC
CNC
CAM
CAD/CAM
CIM
CAE

21. What is the difference??? CAD/CAM CAD
is an automated technology for electronic capture of geometry (form and fit) of parts and how the parts are arranged to form subassemblies and assemblies.

22. What is the difference??? CAD/CAM CAM
Originally CAM referred to numerical control of machine tools.
Now CAM includes all automated processes in MFG.

23. What is the difference??? CIM
The use of computer control and information technology to integrate and automate basic product development and production activities in a manufacturing enterprise.

24. What is the difference??? CAE
is the broad usage of computer software to aid in engineering tasks. It includes computer-aided design (CAD), computer-aided analysis (CAA), computer-integrated manufacturing (CIM), computer-aided manufacturing (CAM), material requirements planning (MRP), and computer-aided planning (CAP).

25. What is the difference??? CAD/CAM with CNC machine CAD CAM STATION
Part
Geometry
CAD
STATION
CAM
STATION
NC Programming
G-Code Programming NC
Programs
Ideas
Old Designs
Creativity
Standards
Speeds/Feeds
Material & Size
Tooling
NC or CNC
Machine Tool
Parts

26. CATIA (CAD/CAM/CAE)
Pro-E (CAD/CAM/CAE)
NX (CAD/CAM/CAE)

27. Solid Edge (CAD/CAE)
Solid Works (CAD/CAE)
Inventor (CAD/CAE)

28. ANSYS (CAE/FEA)
NX Nastran (CAE/FEA)
ABAQUS (CAE/FEA)

29. What is numerical control
Historical background
NC is based on the work of man named John T. Parsons in he developed a method of using punched card containing coordinate position data to control a machine tool
In 1948 he demonstrated his concept to US air force, which sponsored researches at servomechanisms Lab at MIT (Massachusetts institute of technology)
The first demonstration of NC concept was proven

30. What is numerical control
Definition of Numerical Control NC
NC is the term used to describe the control of machine movements and various other functions by instructions expressed as a series of numbers and initiated via an electronic control system
Computerized Numerical Control CNC is the term used when the control system includes a computer
NC also defined as: form of programmable automation in which the process is controlled by numbers, litters , and symbols.

31. Part selection for NC Machine
Parts with substantial tooling cost
Parts with lengthy setup time on conv. machine
Parts in small or variable lots
Parts in wide diversity
Parts produced at intermittent times
Parts in complex configuration (accurate)
Parts with mathematical complex contours

32. Part selection for NC Machine
Parts at very expensive prices
Parts of high priority
Parts with anticipated design changes
Parts with non-uniform cutting conditions
Parts design in families
Parts of mirror-image copies

33. Planning for use NC Basic knowledge of how NC works
General knowledge about machine tool and control unit
Best measure is to attend NC training programs offered by NC vendors, and suppliers

34. Planning for use NC Capital Investment
Substantial initial cost as compared with conventional (500,000-10,000,000) L.E.
Machine should be scheduled to pay itself

35. Planning for use NC Personnel and training
Selecting the qualified and skilled personnel to cope with such technology

36. Planning for use NC Programming and tooling
Tooling is related to the programming (choosing size and shape of cutting tools)

37. Planning for use NC Cost analysis
Rather than the cost analysis of conventional machining operation
Programming cost
Tape of media preparation cost
Note the lead time on NC is shorter than conventional
5% time on the NC machine
95% waiting and inspection

38. Planning for use NC Maintenance and repair
Based on education offered by controller vendor
Maintenance and operation of NC equipment must be restricted to trained and competent personnel

39. Planning for use NC Quality control
The adverse effect of operator skill, fatigue and human reliability have been reduced to minimum
More complex parts can be produced at high level of accuracy as well as quality

40. Planning for use NC Reduction of inventory
Inventory of finished product is held to minimum as NC provides shorter lead time.
Raw material inventories can also be held at minimum

41. Planning for use NC Service responsibility
Define problem origination either from machine tool or control unit
Best practice recommends purchasing the control unit and machine tool from the same vendor

42. Planning for use NC Environmental requirement
Special attention should be paid to the cleanness and possibility for air conditioning

43. Advantages of NC High rates of productivity Uniformity of the products
Reduce components rejection
Reduce tooling cost
Less operation involvements
Complex shapes machined easily

44. Questions???!
Which one needs NC A B D C

45. Questions???!
Which one needs NC A B