据古籍《世本》记载，石磨也是鲁班发明的。一次，鲁班看到一个老太太在一点一点地用木棍磨谷物。鲁班用两块比较坚硬的圆石，各凿出密布的浅槽，合在一起，用人力或畜力使它转动，就把谷物磨成粉了。据说，刨子、曲尺、钻、凿子、墨斗等都是他发明的。这些实用工具把人们从原始、繁重的体力劳动中解放出来。

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