1817年，另一位英国人罗伯茨采用了四级带轮和背轮机构来改变主轴转速。
In 1817, another British Roberts adopted with round 4 wheel mechanism and back to change spindle speed.
实验的测试结果表明工件-主轴系统的阻尼特性很大程度上受轴承结构型式及带轮安装方式的影响。
It is found that the damping properties of the work-spindle system are largely affected by the type of main bearing and the mounting method of the pulley.
磨轮采用易接近设计，更换车轮时可保证安全和简便，通过机器侧面，主轴带可方便地更换检修门。
The grinding wheel is easily accessible enabling safe, simple wheel changes and the spindle belt can be changed from a convenient access panel on the side of the machine.
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