It is necessary to keep the preload constant over the speed range of the spindle.

保存在纱锭的速度范围上的预载常数是必需的。

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The boring power comes from the head-stock of a universal lathe, so the spindle speed could be adjusted in a wide range and satisfactory end face scraping quality is obtained.

镗削动力头采用了普通车床的床头箱，主轴转速调节范围大，刮削端面性能良好。

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This apparatus is enable to change the rotational speed of the pump in a wide range, to heat recirculating water and to load both axial and radial forces on the pump spindle.

该装置的特点是调速范围大，工作介质温度高，可以同时对泵轴进行径向和轴向加载。

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This apparatus is enable to change the rotational speed of the pump in a wide range, to heat recirculating water and to load both axial and radial forces on the pump spindle.

该装置的特点是调速范围大，工作介质温度高，可以同时对泵轴进行径向和轴向加载。

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