CNC Machining Lab Report
Date: March 18, 2013
Group Leader: Jian Wu
Group Number: G4
Regment No.: D
1.Objective and introduction.
2.Principles and practice.
3.Design and result.
4.Conclusion and recommendations.
1. Objective and introduction * Objectives Operate the CNC milling machine using G-codes, M-codes in a CNC program. * Equipment: Minitech CNC machine (Series 2) * Machine introduction Most CNC milling machines are computer controlled vertical mills with the ability to move the spindle vertically along the Z-axis. This extra degree of freedom permits their use in die sinking, engraving applications, and 2.5D surfaces such as relief sculptures. When combined with the use of conical tools or a ball nose cutter, it also significantly improves milling precision without impacting speed, providing a cost-efficient alternative to most flat-surface hand-engraving work. CNC machines can exist in virtually any of the forms of manual machinery, like horizontal mills. The most advanced CNC milling-machines, the multiaxis machine, add two more axes in addition to the three normal axes (XYZ). Horizontal milling machines also have a C or Q axis, allowing the horizontally mounted workpiece to be rotated, essentially allowing asymmetric and eccentric turning. The fifth axis (B axis) controls the tilt of the tool itself. When all of these axes are used in conjunction with each other, extremely complicated geometries, even organic geometries such as a human head can be made with relative ease with these machines. But the skill to program such geometries is beyond that of most operators. Therefore, 5-axis milling machines are practically always programmed with CAM.
2. Principles and practice * Principle
Milling operates on the principle of rotary motion. A milling cutter is spun about an axis while a work piece is advanced through it in such a