G instruction and M instruction all have the branch of mode and blame mode instruction. Mode instruction: Also call add effect the instruction, by the function cent is a certain number of groups, watch 2-3 wins the bid the 2nd times identical abecedarian is with group. Once mode instruction is appointed in block, effective all the time, till invalidation of the ability when appearing to be the same as group of another instruction or be cancelled by other injunction, with on one paragraph of identical mode the instruction can be not written elliptically. Be not mode instruction: Be not add effect instruction, in the block that appearing only effective, when below one paragraph of program needs, must rescript (like G04) . For example: N001 G91 G01 X10 Y10 Z-2 F150 M03 S1500; N002 X15; N003 G02 X20 Y20 I20 J0; N004 G90 G00 X0 Y0 Z100 M02; Explain: 1) appears the first paragraph G91 of 3 mode instruction, G01, M03, because they are different group and all add effect, among them the invalidation when G91 function continues to the 4th paragraph of occurrence G90; G01 function relays in the 2nd paragraph add is effective, appear to the 3rd paragraph be cancelled when G02; M03 function till invalidation of the ability when become effective of the 4th paragraph of M02. 2) expresses 2-3 (3) column has “*” and watch 2-4 (the person that 5) column has “*” dictates to be not mode, in the block that its function is appearing only effective. 3) expresses 2-4 (the M statement that 2) column has “*” , its function and the movement that are the same as paragraph of other injunction begin at the same time. Express 2-4 (the M statement that 3) column has “*” , its function begins with the ability after be the same as paragraph of other injunction action to finish. CNC Milling