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Tham khảo tài liệu 'theory and design of cnc systems part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 54 2 Interpreter Table 2.4 Operations and fixed cycle function codes Operation G-code Operation G-code Peck Drilling G73 Roughing G90 Reverse Tapping G74 Threading G92 Fine Boring G76 Face roughing G94 Cycle Cancel G80 Finishing G70 Drilling Cycle Spot Boring G81 Turning Roughing G71 Drilling Cycle Count Boring G82 Face roughing G72 Peck Drilling G83 Copying G73 Drilling Tapping G84 Grooving G74 Rigid Tapping G84.2 Face grooving G75 Reverse Rigid Tapping G84.3 Multiple threading G76 Boring G85 Circular Elongated Holes Boring G86 Circular Back Boring G87 Milling Circumferential Slot Boring G88 Facing Boring G89 Circular Pocket to the opposite side of the tool cutter and finally retracts the tool upwards to avoid damage to the machined surface. The detailed procedure for the fine boring cycle function is given below. 1. The tool is moved to the cut start position. 2. The tool is moved rapidly to the R position. 3. With the tool movement to the Z position boring is carried out. 4. If G76 is commanded with P address the dwell function is executed. 5. The spindle orientation function M19 is executed. 6. The tool is moved rapidly by the amount specified with the Q address along the direction specified by the parameter. In this example it is assumed that the XY plane is selected as the machining plane and therefore the tool can be moved along the X-axis or Y-axis. 7. The tool is rapidly retracted to the specified position. If the G99 code is effective tool movement position becomes the R position and if G98 code is effective the tool movement position becomes the cut start position. 8. The tool is moved rapidly by the length specified with the Q address to the opposite direction pre-defined by parameter. 9. Tool rotation starts again. 2.3 Main CNC System Functions 55 Fig. 2.18 Fine boring cycle movements Horizontal axis Fig. 2.19 Circular slot cycle - circular pattern of slots 56 2 Interpreter Fig. 2.20 Face milling pattern and parameters 2.3.7 Skip Function During the .
