It is widely acknowledged that some special drilling areas exist in aircraft assembly. For example

the wing root and the vertical tail. Not only are they narrow in space but also require certain height

which makes it difficult to fully harness the advantages

especially in the usual automatic drilling device and robot drilling system. Hence

a portable helical trajectory drilling device was designed in order to solve the problems. This device is compact

portable and could set process parameters according to the program

besides

it may be applied in drilling of aeronautical materials. Moreover

tool feed speed can be changed automatically for multilayer material. In this paper

the authors applied the developed spiral trajectory drilling device to examine the drilling of 7075–T7351 multilayer Al alloy material. It is showed that the accuracy of this device reached the expectation and the rationality of the design and control methods of the new type drilling device was verified.