The difference between these three instructions is that:
G32 is equal pitch thread machining.
G72 is Tam compound fixed cycle.
G82 is a multi-thread compound fixed loop.
G92 is a fixed cycle with single thread shape.
Matters needing attention in NC thread turning with extended data;
1. The tip of the threaded tool must be kept at the same height as the rotation center of the workpiece. After the tool is sharpened quickly, use the tool alignment template to align the tool with the axis of the workpiece, and keep the tool tip angle installed correctly.
2. Set a certain point as the reference point for rough and finish machining of thread cutter, and align the cutter with the usual method. In the actual process of tool alignment, as long as the tool is slightly adjusted, the trial cutting method is used.
3. In thread processing, if the tool is worn or broken, it is necessary to sharpen the tool again and then straighten it. If the workpiece has not been removed for repair, it is only necessary to overlap the installation position of the thread cutter with the position before removal, which is equivalent to machining with the same turning tool.
4. If the excised workpiece is repaired, the starting point position of machining shall be determined for repairing machining.
Thread turning principle
There are many processing methods of thread, among which turning is a common processing method. No matter what kind of thread is turned, a strict kinematic relationship must be maintained between the lathe spindle and the tool: every time the spindle rotates (that is, the workpiece rotates once), the tool should move a lead evenly.
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