The images below show the effects of the differing helical leads on a thread milling toolpath with 1 turn.
180
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View down Z:
90
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View down Z:
45
ISO View:
View down Z:
For internal threads (a Cycle Type of Thread milling) and an upwards, right hand thread:
- With an Operation of Through hole the Lead in starts below the bottom of the hole so the thread is cut from the bottom of the hole:
- With an Operation of Drill to hole depth the Lead in starts at the bottom of the hole and the thread starts the Lead in distance away from the bottom of the hole:
