1. 2008013438 Kim Jeong Geon

2. NARA CORPRATION’S major product is COUPLING, TURNING GEAR, GEAR BOX These products are used various fields Wind solution, fluid drive marine engine, Flexible coupling

4. First. Circle material Round bar cutting

5. According to drawings using CNC, lathe Working Rough glinding ( 2 ~3mm gives free) -Used When a large machining allowance -Routh glinding used roughly pare

6. This step is heat treatment Standard is normalizing

7. After heat treatment 2~3days leaving alone (To remove heat treatment Stress relief)

8. According to drawings using CNC, lathe Working Finishing Finising used Minutely pare

9. Using various cutters that cut the teeth of gear