Final week

This week was really a critical week.

We learned a new technique of grinding, that is punching. We placed the thicker side of the work piece against the stopper on the magnetic table. According to what Mr Teng said, this was important due to safety reason. It prevents accident from occurring. It was because if we ground the thinner side first, there might be some students forgot to move the grinding wheel forward and after turn the work piece over to the thicker side, they just move the work piece inside, then the grinding wheel will hit the work piece and it might fly out due to huge impact. Punching is a technique that moves the y-axis slowly, 10 mm at a time. It was different from what we had done last time. Last time, we either moved the y-axis continuously or did not move it at all. But now is move y-axis gradually.

Also, we learned to grind the vertical surfaces of the 'U' shape. To do this, we could just grind them using the back side of the grindning wheel. There is a step at its back side in order to grind such vertical surfaces.

Luckily, in this final week I did not make mistake.

And next week, I am going to learn turning machine, which many people said it is really hard as there are many formulae involved. Hope that I can cope with it and no accidents occur.