First of all, the spindle speed must be very low because of the large pitch. If you consult the instruction manual of the CNC lathe, you can accurately calculate the maximum speed of the spindle.
Second, the depth of the oil groove is shallow, and the cutting force is not large (compared with trapezoidal thread and worm), but the influence of the spiral angle should be considered when sharpening the tool.
Third, the problem of programming: Programming with G32 continuous thread cutting function, starting from the outside of the workpiece before the starting point of the spiral groove and ending at the starting point of the oil groove, then processing the straight thread with G32, and finally exiting the workpiece with G32 processing the tapered thread. The format of the numerical control program is as follows: ..................................................................................................................................................................... G32XZF enters the oil groove of the workpiece G32Z, and G32XZ exits the workpiece G0XZ. The second and third G32 may be omitted.