1. MANHOLE COVER.
한 준

2. Contents.
1. What is the Manhole ?
2. Process
3. End

3. 1. What is the Manhole ?
A Manholes is made so that the people can get to work.
And Manholecover is the most circular.
The reason is easy because different shape dumping inside.

4. 2. Process 1.
Die manufacturing 2.
Pour molding sand

5. 2. Process 3. Pour the melting steel at hole.
4. At normal temperture, cooling and flip

6. 2. Process 5. Cracks using the hammer unnecessary parts. 6. Grinding
the rough side
smooth

7. 2. Process
Finish !!

8. 3. End
Thank you !