Port Spiral Finishing

Use the Port Spiral Finishing page of the port spiral finishing dialog to specify the options for spiral finishing the inside of a port.

Pattern — Select a pattern to specify the location of the port and the orientation of the subsequent machining. The pattern serves three purposes:

Indicates the port to machine.
Controls the orientation of the slices. The slices are normal to the pattern. If you use Workplane Limits then the workplanes override the pattern.
Determines which end of the port is machined first.

Tool clearance — Enter the tool shank and holder clearance. This is in addition to any Thickness defined and is added to the side of the tool to avoid collision with cusps or unmachined material. The clearance value controls how much PowerMill changes the tool axis to be safe.

Holder clearance

Shank clearance

Tool shaft clearance

Note: PowerMill automatically adds a small tapered clearance around the bottom of the shaft of the cutter. The length of the tapered portion is the same as the tool radius.

Cut direction — Select the milling technology.

Select a Cut Direction from the following:

Climb — Select to create toolpaths using only climb milling, where possible. The tool is on the left of the machined edge when viewed in the direction of tool travel.
Conventional — Select to create toolpaths using only conventional or upcut milling, where possible. The tool is on the right of the machined edge when viewed in the direction of tool travel.
Any — Select to create toolpaths using both conventional and climb milling. This minimises the tool lifts and tool travel.

Tolerance — Enter a value to determine how accurately the toolpath follows the contours of the model.

Thickness — Enter the amount of material to be left on the model, within tolerance, when gouge checking.

Component thickness — Click to display the Component thickness dialog, which enables you to specify the thicknesses of the different surfaces.

Stepover — This is not available as toolpath segments helically stepdown in the direction of the spine curve.

Stepdown — Enter the distance between different machining levels.

Copy stepdown from tool — Click to load the axial depth of cut from the active tool's cutting data. The axial depth of cut is measured along the tool axis.

Note: If you enter the value manually, the button changes to

Preview — Displays the pattern used to create the toolpath.

Draw — Select to display the preview pattern.