In view of some of the difficult points for machining the hanging pup joints used in directional wells, a special technology for deep-hole machining is developed.

To rebuild normal turner into machine tool of deep-hole machining based on programmable logic controller (PLC) and AC frequency control technology, electrical control system of high performance machine tool was designed, which could realize self-turning.

This paper analyzes the methods of deep hole machining.

Deep hole machining is an important branch of machining and deep-hole boring is an important component of deep-hole machining.

The research of the deep hole processing system which used gun-drill and the forced-air cooling technique;

Selection of cutting parameter in deep hole processing;

The deep hole processing is working in a state of close or semi-close, its course is unstable.

Aimed at the characteristics of oil pressure monitoring signals having pulse interference and the random non-stationary noise in deep hole drilling process,this paper presents a filtering method of anti-impulse interference moving average based on wavelet packets.

Electrode wear affects accuracy of micro-EDM deep hole drilling seriously.

This deep-hole processing robot inherits the traditional advantages of deep-hole processing methods on the basis of the deep hole for the difficult process with the general processing of ultra-long tube design.

After that,they also indicate the further understanding of the deep-hole processing features,which are the mechanical properties.