Which practice is essential for producing accurate external threads using a die?
Ensuring the die is aligned squarely with the workpiece axis
Cutting an external thread with a die requires the thread to be concentric with the bar and of uniform pitch all the way round, which depends on how the die is presented to the work.
The key practice is to keep the die face square, that is exactly perpendicular, to the workpiece axis as it is started and rotated.
When the die enters square, every tooth engages the bar evenly, so the thread is cut straight, of even depth, and true to the axis.
Tilting the die away from the axis (option 1) makes it cut deeper on one side, producing a crooked, tapered or drunken thread.
Applying uneven pressure while turning (option 3) causes the die to wander and gives an irregular, poorly formed thread.
Skipping lubrication (option 4) lets the teeth tear rather than shear the metal, giving a rough, torn thread and rapid die wear, so all three are bad practice.
Hence, the answer is Ensuring the die is aligned squarely with the workpiece axis.
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