Tap is used to drill tapping internal thread, generally marking first, then play positioning hole, and then artificial or mechanical tapping;

Round die is used to do cylindrical external thread, such as supporting bolts and so on, generally do three point positioning, pay attention to maintain force and peace.

Screw thread with die:

1. The processed workpiece is clamped on the three-jaw chuck, and the length of the thread is determined and the line is crossed;

2. Clamping die set thread Tool force into the lathe tail seat sleeve, select the right to meet the requirements of the die, and its front outward, the reverse side and hole bottom by flat mount sleeve thread tool lock, find the tail seat position, pull the tail seat sleeve handwheel, so that the die gently set on the workpiece circle;

3. with die sleeve thread, must use cutting fluid.

To tap a thread with a tap:

1.With Twist Drill drill car thread bottom hole, chamfering 30 to 45 degrees, and the diameter is slightly greater than 57 chamfering;

2. According to the requirements of the tap, with the tail seat zero scale to find the tail seat center, the hinge rod sleeve is locked on the tap square bar, and the tap into the hole, pull the tail frame top, against the tap tail center hole.