مشروع تخرج بعنوان Design & Manufacturing of Drilling CNC Machine

أخوانى فى الله
أحضرت لكم مشروع تخرج بعنوان
Design & Manufacturing of CNC Drilling Machine
Graduation Project
Under Supervision of
Dr. Hanafi mansour
Asst.prof of Mechanical Design and Engineering tribology
Faculty of Engineering, Helwan University
Dr. Mohamed Osama
Head of Department of computer engineering
High Institute Of Engineering
Culture & Science City
TEAM MEMBERS :
1. Farid Ibrahim Hussein
2. Mahmoud Anwer Mahmoud
3. Mahmoud Wagih yousef
4. Mohamed Atef Ashry
5. Mohamed Fouad Hamza
6. Mohamed Mortada Mohamed
7. Mohamed Mostafa El_Desouki
8. Mohamed Saber Sadek
9. Tarek Yehia El-saye

ويتناول الموضوعات الأتية :

Contents
Chapter 1: Introduction page no.
1.1 Introduction to Computer numerical control 1
1.1.1 Definition 1
1.1.2 Applications 1
1.1.3 Advantages and Limitations 1
1.1.4 Elements of a CNC machine 2
1.1.5 Principles of CNC 2
1.1.6 Closed-loop Control Systems 4
1.2 Cutting force analysis
1.2.1 Drilling 5
1.2.2 Milling 11
Chapter 2: Mechanical Design
2.1 Fits & tolerance 13
2.1.1 Introduction 13
2.1.2 System of fit 15
2.1.3 Type of fit 16
2.1.4 Recommended fits 16
2.2 Shaft & axles 19
2.2.1 Introduction 19
2.2.2 Shaft Loads 20
2.2.3 Shaft Materials 21
2.2.4 Shaft Power 21
2.2.5 Shaft Stresses 21
2.3 Power screw 22
2.3.1 Screw threads 22
2.3.2 Coefficients of friction for screw thread 22
2.3.3 Force required pushing a box up or down an incline 23
2.3.4 Torque, power and Efficiency 23
2.3.5 Types of Screw threads 24
2.3.6 Power Screws 26
2.3.7 Friction Load on power screw 27
2.3.8 Types of Loading 28
2.3.9 Design of power screw 28
2.4 Bearing Selection 29
2.4.1 Introduction 29
2.4.2 Classification of bearing 30
2.4.3 Bearing used in this project 31
2.4.4 Bearings and Lubricants 35
2.4.5 Calculation for selecting bearing for power screw shaft 37II
Chapter 3: Electrical design
3.1 Motor selection 38
3.1.1 Stepper Motor 38
3.1.2 Permanent magnet DC Motor 39
3.1.3 DC Motors VS. Stepper Motors 42
3.2 Microcontroller 44
3.2.1 The difference between the microprocessor & the microcontroller
3.2.2 Types of Microcontroller 45
3.2.3 Features of 98C52 microcontroller chip 46
3.2.4 Interrupts of the 98C52 46
3.2.5 Types of memory in the 89C52 47
3.3 Sensors & feed back 48
3.3.1 Controlling permanent magnet DC Motor using optical encoder
3.3.2 Optical encoder 49
3.3.3 Position measurement 50
3.3.4 Limit Switches 51
3.4 Programming 52
3.4.1 Flow chart of Origin subprogram 52
3.4.2 Flow chart of drilling process 53
Chapter 4: Mechanical Calculations
4.1 Drawing 58
4.2 Power screw torque calculation 75
Chapter 5: Implementation
5.1 Why this project 80
5.2 Project procedures 82
5.2.1 Data gathering 83
5.2.2 Choosing anatomy of motion & design 86
5.2.3 Our CNC machine 90
5.2.4 Drafting & editing 92
5.2.5 Control implementation 94
5.2.6 Choosing actuators 97
Chapter 6: Budget & Future Recommendations
6.1 Budget 101
6.2 Future recommendations 102
References 103
Appendix 10

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