In order to meet the requirements of finishing a large number of small mounting surfaces in aircraft assembly manufacturing

a technical scheme of finishing with portable milling machine is proposed. Through the analysis of the precision machining object and the portable machining process

carry out force analysis

dynamics modeling and detailed design of the portable precision milling machine

and carry out the application and comparative analysis. The results show: for the batch manufacturing of small mounting surface of aircraft

in terms of processing efficiency

the portable finishing milling machine improves about 3 times compared with the fixed milling machine

and in terms of processing accuracy

the portable finishing milling machine improves about 5 times compared with the hand grinder.