在機械實驗室和工業環境中都需要用數控機械來代替人做複雜的操作。銑削數控機床是一種數控機械而可以創造特殊的那一部分。現在，我們要研發的基本銑削數控機床為含有5軸的多軸 - 中心機。我們要優化一台機器，包括設計，參數，電源...方法分析的有限元分析法。在這項研究中我想比較，有和沒有延伸軸 - 4軸和5軸數控設計。

In mechanical environment of laboratory and industrial is needed CNC machine to replace human do complex operation. Milling CNC machine is one of CNC machine, which can create special parts. Nowadays, we develop basic milling CNC machine into multi axis - center machine with 5 axes. We want to optimize a machine include design, parameter, power... One of methods analysis is Finite element analysis method. In this study, I want to build and test CNC router machine, with and without extend axis – 4-axis.
By analyzing method, we know which parts need to modify, factors damage to this design. Comparison with the other geometry, the high advantage of disadvantage of each design was determined and adjusted. Build and test process will provide helpful experiments and real effects of assembling.
One CNC router always operates in high frequency, which are spindle rotation and axis movement. Therefore, increasing effect of natural frequency to machine is top technical request.

CHAPTER 1 INTRODUCTION 1
1.1. Milling machine 1
1.2. Manufacturing Automation 3
1.3. Computer Numerical Control machines 5
1.4. How does the CNC machine work? 7
CHAPTER 2 DESIGN OF TABLE TOP CNC ROUTERS 12
2.1. What is a CNC router? 12
2.2. Design of table top CNC routers 13
2.2.1. Key design decisions 13
2.2.2. The structure of machine 15
2.2.3. Mechanical drive components and the motion systems 23
2.2.4. The electric components 30
a. The CNC controller 31
2.2.5. The software 32
2.3. Post processor 32
CHAPTER 3 FINITE ELEMENT ANALYSIS OF CNC ROUTERS 34
3.1. Finite element modals 35
3.2. Static analysis 42
3.3. Nature frequency analyses 50
CHAPTER 4 BUILDING AND TESTS OF 4-AXIS CNC ROUTERS 54
4.1. Building and Tests of 4-axis routers 54
CHAPTER 5 CONCLUSION & FUTURE WORK 57
5.1. Conclusion 57
5.2. Future work 58
REFERENCES 59

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