论文部分内容阅读
手搭钻的选择手摇钻在中小学科技活动中经常使用,目前,中小学生普遍使用如图1的手摇钻。在Power Tech比赛中,一些学校使用进口的手摇钻,如图2,这种手摇钻性价比较高,质量可靠。我国生产的手摇钻价格相差不大,性能差别却很大,相比较而言,图3的产品更适合中小学生在Power Tech比赛中使用。它采用双齿轮传动,具有以下优点:1.采用45号钢材质,硅熔胶工艺铸造钻架和手摇盘,精度高;2.加厚高强度ABS工程塑料手柄,手柄内可以存放备用钻夹头;3.粉
Hand Lash Selection hand drill in science and technology activities in primary and secondary schools are often used, at present, primary and secondary students generally use the hand drill as shown in Figure 1. In the Power Tech competition, some schools use imported hand-cranked diamonds, shown in Figure 2, which are more cost-effective and reliable. China’s hand drill price difference is not big, the performance difference is very large, in comparison, Figure 3 is more suitable for primary and secondary students in Power Tech competitions. It uses the double gear transmission, has the following advantages: 1. Using 45 steel, silicon melt casting process cast iron and hand crank plate, high precision; 2. Thickening high strength ABS plastic handle, the handle can be stored spare drill Chuck; 3 powder