rotate freely meaning in English

旋转自如

The combination of hardware and software make data gathering , on or off laser and mirror rotating freely , all these functions enable the system orientate precisely and mark automatically . by experimental study of continuous marking and scanning marking ( lattice marking ) , and synthetic analysis of the technologic parameters , the optimization of route and experiment method is advanced in details
在完成激光打标系统控制功能的前提下，分别对连续打标(笔划式)和点阵打标(扫描式)两种方式的打标效果进行试验性研究，通过试验总结出两种打标方式的优缺点。