Start Z Angle > 90

The Start Z Angle > 90 parameter is used to direct the shank orientation at the beginning of the surface cut. This parameter is not used if the Minimum Tilt mode is selected.

4 Axis

The tool is shifted off the axis of rotation centerline. The Start Z Angle > 90 parameter determines the direction off centerline to shift. You can choose either side of centerline for the shank orientations when the swarf cutting starts.

Yes

Click Yes to begin cutting with the tool shank on the opposite side of the rotary axis centerline.

No

Choose No to leave the tip of the tool below the shank (in Z, as depicted on the screen). The tool is oriented to the side of the part that requires the least amount of part rotation.

5 Axis

The Start Z Angle > 90 parameter is the true angle between the tool shank and the positive Z axis. You can choose either of the two possible shank orientations when the swarf cutting starts. Once the cutting is started the orientation of the tool shank is controlled by the shape of the surface.

Yes

Some machines are capable of pivoting the tool so that the tip is higher in Z than the rest of the shaft. Click Yes to begin cutting with the tool tip more positive in Z axis than the shank.

No

Choose No to leave the tip of the tool below the shank (in Z). Using the No choice does not guarantee that the tool tip will always be the lowest part of the tool. When the surface goes "over a hill" in the direction across the cuts, the tool tip will become more positive in Z axis than the rest of the tool.