In 1817, another British Roberts adopted with round 4 wheel mechanism and back to change spindle speed.

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。

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For the power in case of a power failure, back electromotive force of a spindle motor can be utilized.

对于在电源故障情况下的电力，可利用主轴电机的反电动势。

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NKE spindle bearings of universal design (suffix UL) feature a light preload when mounted in pairs or sets either face to face or back to back.

NKE的通用设计(后缀ul)，主轴轴承具有轻预紧安装时成对或成套面对面或背靠背。

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