How often should the die be backed off during external thread cutting?
Periodically during cutting to break chips, depending on material conditions
During external threading with a die, metal is removed as continuous chips that must be broken and cleared or they clog the die and tear the thread.
The standard practice is to back off the die by turning it a part-turn in reverse periodically as cutting proceeds; this snaps the chips and clears them.
How often the reverse turn is needed depends on the material and cutting conditions, tougher and gummier materials needing it more frequently.
Backing off only once at the start, only at the end, or only after each full thread would not keep the chips broken throughout the cut.
Hence, the answer is Periodically during cutting to break chips, depending on material conditions.
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