3.cutting grooves: We planned to slot the grooves using the vertical milling machine, however,we found it to be hard to press the board from both sides. Therefore we accomplish this task by sawing with the electric saw instead. Processing tools:electric saw,mill(锉刀)； Parameters:Width of the groove:4-5mm. Length:according to the graph paper. The boards need to slot the grooves: 12*8#2,12*6#1,180*15#4,180*35#4 According to the graph paper,label the cutting path on the boards,cut off the undesired part and take out the wastes,Mill the rough edges with the file.Expand the grooves to the appropriate width in which the screw could slide.Then mill and make the edges smooth.At last mill the closed angles into roundish to prevent the mechanism to get stuck at that3. cutting grooves: We planned to slot the grooves using the vertical milling machine, however, we found it to be hard to press the board from both sides. Therefore we accomplish this task by sawing with the electric saw instead. Processing tools: electric saw, mill(锉刀); Parameters: Width of the groove: 4-5mm. Length: according to the graph paper. The boards need to slot the grooves: 12*8 #2, 12*6 #1, 180*15 #4, 180*35 #4 According to the graph paper, label the cutting path on the boards, cut off the undesired part and take out the wastes, Mill the rough edges with the file. Expand the grooves to the appropriate width in which the screw could slide. Then mill and make the edges smooth. At last mill the closed angles into roundish to prevent the mechanism to get stuck at that