Do not use any sort of heavy machinery — drill press, lathe, or mill; it will not be safe.
不要用像钻床、车床、磨坊等重型器械，这样不安全。
To build this really requires a lathe, bandsaw, drill press…etc.
建立这确实需要一个车床，带锯，钻床等…
Application: Main shaft of machine tool, auto steering structure, main shaft of lathe, grinder, milling machine, drill press, water power dynamotor, tower crane, screw shaft and so on.
应用领域： 车床，磨床，轧机，钻压机，水力发电机，塔吊，螺杆轴的主轴，汽车转向装置等。
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