Which practice is essential for producing accurate external threads using a die?
Ensuring the die is aligned squarely with the workpiece axis
When cutting an external thread with a die, the thread must be concentric and square to the bar so the pitch is uniform all round.
Keeping the die aligned squarely, that is perpendicular, to the workpiece axis ensures the die starts straight and cuts an even thread without drift.
Tilting the die produces a crooked, tapered thread, uneven pressure gives an irregular cut, and skipping lubrication tears the thread, so those are wrong practices.
Hence, the answer is Ensuring the die is aligned squarely with the workpiece axis.
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