The cam-an irregularly shaped member on a rotating shaft that transfers motion-has been around since Leonardo da Vinci invented the cam hammer around 1497. Modern uses of the cam include the Nautilus exercise machine, which the late Arthur Jones invented around 1970. The machine uses a cam to modulate resistance. Until recently, the study of cam design and application was a foundation in mechanical-engineering curricula. Today, it seems that you can't find its study anywhere.
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机译：自从莱昂纳多·达·芬奇（Leonardo da Vinci）大约在1497年发明凸轮锤以来，凸轮就一直存在，凸轮是传递运动的旋转轴上的不规则形状的部件。凸轮的现代用途包括Nautilus运动器械，那是已故的亚瑟·琼斯（Arthur Jones）在1970年左右发明的。机器使用凸轮来调节阻力。直到最近，凸轮设计和应用的研究仍是机械工程课程的基础。如今，您似乎找不到任何地方的研究。
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