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取两块长2厘米、宽1厘米的小铁块,其重刚好能使单股橡皮筋上端稍有张力,但不要产生太大的形变,将单股橡皮筋夹在两小铁块中间,如下图所示。然后用线(或橡皮筋)将两个铁块箍紧,再将上述单股细软橡皮筋的上、下两端分别穿过事先已制作好的U形铁片的两个小孔中,打结后系住(注意U形铁片两小孔要尽量光滑,以免把橡皮筋磨断)。这样小铁块就能以橡皮筋为轴自由转动了。
Take two 2 cm long, 1 cm wide and small iron, the weight just can make a single stretch of rubber band slightly tension, but do not have too much deformation, the single rubber band sandwiched between two small iron, As shown below. Then use the wire (or rubber band) will be two iron hoops tight, and then the single strand of soft rubber band on the upper and lower ends respectively through the pre-made good U-shaped iron two holes, hit After the tie fasten (note that the two holes U-shaped iron to be as smooth as possible to avoid the rubber band worn off). This small iron can be rubber band axis rotation.