BAER Encyclopaedia
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A lead screw is the part of a machine tool that transmits feed or movement over long distances by means of a thread – e.g. in clamping devices.
The lead-in is the front portion of a tap or die where the thread "engages" and the cutting process begins.
When tapping threads, this means:
The lead-in makes it easier to position the tool and reduces cutting forces.
The lead-in zone influences how cleanly the thread starts and how much load acts on the cutting edges.
