| The GE5-1000s tube-lather, which was made in Spain, was mainly used for processing the petroleum pipeline thread and fixing the original pipeline thread. Because there are quite difference of the same kind of machine tool in the design of control system between that of the overseas and of the local, the operator feel not better to use the machine tool at actual operation. As a result the machine tool could not work after the machine tool was install and adjust in several years. To solve this problem, and at the same time to improve the automatic degree, we put forward to use the numerical control system alter the machine tool.The altering design of the tube-lather of using the NUM1040T, the number controls system, was introduced in this text. Three point problems, altering of machine tool electric, PLC control and implement of the function of resumption of thread cutting, were expatiatedNUM-1040T numerical control system is an open and powerful numerical system. Besides the basic functions of the others numerical control system, it has the continuously function of resumption thread cutting, which is cutting the thread continue the originally thread and without the phenomenon of different thread. According to the characteristics of the machine's structure, the machine has been configured the NUM1040T numerical controls system and NUMDRIVE numerical servo. The BPH electromotor has been installed in two enter coordinates respectively (X: 22N. m, Z: 36N. m). And we have installed the coder in the headstockThe designs of the main circuit: the shift gears of the spindle and the control of positive or reversal implemented drive by SIMENS servo system; To implement of the positive or reversal of the numerical control knife rest, we should change the phrase order of the circuit. The main tasks of the design work about the main circuit are as follows: the, numerical control system; principal axis electric machinery; numerical control knife rest and control circuit of the drive system.Using the PLCTOOL software, which provide by the NUM numerical control system, we have write the programs of PLC control; have realized the signal join between the I/O of PLC and the control panel; the joint between the PLC export and the power electric signal of themachine tool; the joint between the PLC input and I/O of the numerical control installation of CNC machine tool and the implement of the CNC process code and G, M, T.The distinctive function and theory of resumption of thread cutting of the NUM system were analyzed in this paper. Under the comprehension of the G38+, G33 program's variable, Cutting tool aim at the old thread, we have finished the resumption of thread cutting of the old thread, which was lightly destroyed. It has greatly improved the efficiency of producing tube thread, at the same time; it has save the tube materials and cutting tools. After applied the G38+ functions, the precision of the artifact thread has reached to the API standard. The resumption of thread cutting of using G38+ function which provided by NUM numeral control system was firstly carry out in our country.Using the special functions of repairing thread of the NUM system, correct using the programs dictate of G38+, we can repair the original threads, which light destroy thread by ensuring the knife aim at the original thread.
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