It is necessary to keep the preload constant over the speedrange of the spindle.
保存在纱锭的速度范围上的预载常数是必需的。
2
The boring power comes from the head-stock of a universal lathe, so the spindlespeed 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。
3
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.