Lead in and Lead out Arc Radii

This option is used in several machining cycles, with different purposes and behaviors.

Please use the tree on the right side of the screen.

Cycle: All Manual Cycles, Profile cutting, Finishing

Definition for Contouring, Contour rework, Profile cutting, Slotting

These functions allow to define an arc radius for the input and the output of the tool in the material.

Lead in arc radius (A)

This generates an arc at the beginning of the toolpath in order to have a better surface quality at this point. This is generally used when the contouring starts at the middle of a line or an arc. The radius of the lead in arc must be greater than the radius of the tool.

Lead out arc radius (B)

Like for the lead in arc, a lead out arc can be specified on the toolpath. The radius of the lead out arc must be greater than the radius of the tool.

Lead in radius and lead out arc angles

The length of the arc can be adjusted with an angle value ; choosing 90° generates a 1/4 circle, 180° is half a circle.

A: lead in arc radius B: lead out arc radius

Cycle: Chamfering

	Chamfering cycle has been improved to offer greater flexibility during tool positioning. Lead-in and lead-out arcs are no longer restricted to a 90-degree angle
▶️ Watch a video about Lead in/Lead out arc angle for chamfering.

Cycle: Finishing

Definition for Finishing

Lead in and lead out arcs defined following the Z axis

If the rapid motion between two passes is too small relative to the tool diameter, the motion is done with a bend in feedrate.	A bend is automatically created on XY plane.