material testing

Here I am trying out hard material because paper is a modeling material. This time I used electric engraving pen to draw a out line of my window design. At first, I tried out with foam box, which is very easy to cut, just to understand the feeling of using this tool, it spin fast so I need to hold tightly to shape a exact line.

However, when I tried on asbestos board, it shakes a lot, which the outcome wasn't the picture I imagined, and this material is too hard to make holes, so the testing is failed.