Introducing students with elements of building and programming of CNC machine tools. Acquisition of knowledge about measuring systems, drives and control computers of CNC machines, and more detail view on techniques of programming preparation for CNC machines. Assimilating of practical knowledge about generation and executing programs for CNC machines.

Student responsibilities:

Grading and evaluation of student work over the course of instruction and at a final exam:

Activity during lectures - 10%. Seminar - 60%. Oral exam - 30%.

Methods of monitoring quality that ensure acquisition of exit competences:

Active discussions and participation of students during lectures. Continuous monitoring and consultations during drafting of seminar work. Student survey.

Upon successful completion of the course, students will be able to (learning outcomes):

Write the proper process plan required for CNC operation. - Write CNC programs using manual programming for simple 2D components. - Generate NC program by applying CAD/CAM system. - Select the proper tooling used on CNC Milling Machines and Lathes. - Setup and operate 2 axis and 3 axis CNC Milling Machines (Centers) and 2 axis CNC Lathes. - Enter a program into a CNC machine using the conversational programming format. - Define workipiece zero and manufacture workpiece on NC machine tool at Laboratory of machine tools

Lectures

1. Introduction - premises and causes of development of NC machines. Advantages of application.

2. Levels of numerical control: NC, CNC, ACC, ACO, DNC, FMS, CIM, IMS, BMS.

3. Main elements of CNC machines: measuring systems, drives, controllers.

4. Single axis control. Interpolators.

5. Characteristic of CNC controllers.

6. Machining centers. Systems for automatic tool change and automatic workpiece change.

7. Programming of CNC machine tools. Programming techniques.

8. Structure of CNC program at manual programing.

9. Part program structure.

10. CL file and postprocessors.

11. CAD/CAM systems.

12. Integration and programmable controllers - PLC.

13. Direct and distributed numerical control - DNC. Interfaces.

14. Methods and techniques of digitalization. Tool path generation for rapid prototyping techniques.

15. CIM and IMS.

Exercises

1. Preparation for manual programming of CNC machine tools - coordinate system and zero points.

2. Preparation for manual programming of CNC machine tools - types of control and addresses at programming of CNC machine tools.

3. Manual programming of CNC lathes.

4. Application of subroutines and MACRO commands - 3D programing.

5. Application of subroutines and MACRO commands - 3D programming.

6. Using NC module of CAD/CAM system (CATIA) - turning.

7. Using NC module of CAD/CAM system (CATIA) - turning.

8. Program input, workpiece zero determination and program execution.

9. Using NC module of CAD/CAM system (CATIA) - milling.

10. Using NC module of CAD/CAM system (CATIA) - milling.

11. Program input, workpiece zero determination and program execution.

12. Program generation for non-conventional machining.

13. Standards for exchange of graphic data: IGES, VDF, STEP-NC.

14. DNC systems.

15. Working with CAD/CAM system for orthotics design and manufacturing.

Compulsory literature:

Altintas, Y.: Manufacturing Automation, Cambridge University Press, Cambridge 2000.
Cebalo, R.: Obradni sustavi, Vedograf, Zagreb 2000.
S.-H. Suh, S.-K. Kang, D.-H. Chung, I. Stroud: Theory and Design of CNC Systems, Springer Verlag 2008
Kief H.B.: NC HANDBUCH, NC Verlag 2007-2014

Recommended literature:

V.J. Goldenberg: Introduction to Computer Numerical Control (CNC), Prentice Hall, 2003
B. Besant, C.W.K. Lui: Computer-Aided Design and Manufacture, Ellis Horwood 2007