4-Axis Curve Sweeping 

  The information in this section will help you create and manage 4-Axis Curve Sweeping operations
in your Machining program.
More information about the operating mode is available in 4-Axis Curve Sweeping Operation.
To create a 4-Axis Curve Sweeping operation, click and select the geometry to be machined .
More information can be found in Selecting Geometry.

Select the machining strategy tab and choose a guiding strategy for this operation:
Then set the following strategy parameters according to the desired machining:

Specify the tool to be used, feeds and speeds , and NC macros as needed.

4-Axis Curve Sweeping: Strategy Parameters

The 4-Axis Curve Sweeping is done along a planar guide.
The stepover is computed from this guide.
The tool axis is constant in each machining plane (displayed in yellow below) and normal to the guide.

  • Counter-part areas are not machined.
  • As the stepover is computed on the Guide, an incorrect definition of the Guide,
    or a Guide too far apart from the part will lead to incorrect paths.

You need to select a Guide using the sensitive icon:

This guide:

  • is selected in the 3D viewer,
  • must be planar and continuous,
    Straight lines are not allowed.
  • can be restrained by limiting points, selected in the 3D viewer using the sensitive icon,
    You can:
    • click the limiting point in the sensitive icon and select a point in the 3D viewer,
    • or right-click the limiting point in the sensitive icon and select On guide in the contextual menu.

      A red dot appears on the Guide. You can drag it to the required position.
  • is oriented by three directions:
    • M: Machining direction, tangent to the guide at one of its ends.
    • A: Axis direction of the tool, normal to the guide in its plane.
    • S: Stepover side, to define where the first pass starts.
    • all three directions can be inverted by clicking the corresponding arrow.

Once the Guide is selected, the arrows in the sensitive icon turn green.
Click them to display the Starting Directions dialog box.

Clicking Reverse is the same as clicking the corresponding arrow in the 3D viewer.
You can select the Display tool check box to display the tool in the 3D viewer.

4-Axis Curve Sweeping: Machining Parameters

Tool path style

Indicates the cutting mode of the operation:

  • Zig Zag: the machining direction is reversed from one path to the next
  • One way: the same machining direction is used from one path to the next.

Machining tolerance

Specifies the maximum allowed distance between the theoretical and computed tool path.

 

Max discretization step

Ensures linearity between points that are far apart.

The Max discretization step influences the number of points on the tool path: the smaller the value, the higher the number of points in the tool path. Be careful to avoid a high concentration of points along the tool trajectory.

This parameter also apply to macro paths that are defined in machining feedrate.
It does not apply to macro paths that do not have machining feedrate (RAPID, Approach, Retract, User, and so on).

 

4-Axis Curve Sweeping: Radial Parameters

Distance on guide

Defines the distance between paths, on the Guide.

Stepover side

Can be set to the Left or to the Right of the Machining direction.

Max. plunge distance

This check box is not selected by default.

In some cases, unwanted paths might be generated.
For example, in the hole shown below, the tool might plunge to the bottom of the part.
You can select the Max plunge distance and enter a value for it, to prevent unwanted machining paths.

4-Axis Curve Sweeping: Tool Axis Parameters

Lead angle

Defines the lead angle in the direction of motion.

4-Axis Curve Sweeping: HSM Parameters

Select the check box High speed milling to activate and define the parameters for High speed milling. 

Corner radius

Defines the radius of the rounded ends of passes.
The ends are rounded to give a smoother path that is machined much faster.

4-Axis Curve Sweeping: Geometry

You can specify the following Geometry:

  • Part (mandatory) with possible Offset on Part.
  • Check elements (optional) with possible Offset on Check.

Offset groups and Geometrical zones are supported, machining areas are not.
You can also select the Part autolimit check box.

  • Part autolimit does not work on edges of internal holes of parts.
  • No collision checks on the tool assembly and machine head are performed.

4-Axis Curve Sweeping: Tools

Only end mill tools are available.

4-Axis Curve Sweeping: Feeds and Speeds

In the Feeds and Speeds tab page, you can specify feedrates for approach, retract and
machining as well as a machining spindle speed.

Feedrates and spindle speed can be defined in linear or angular units.

A Spindle output checkbox is available for managing output the SPINDL instruction in the generated NC data  file.
If the checkbox is selected, the instruction is generated. Otherwise, it is not generated. 

Feeds and speeds of the operation can be updated automatically according to tooling data and
the Rough or Finish quality of the operation. This is described in Update of Feeds and Speeds on Machining Operation.

4-Axis Curve Sweeping: NC Macros

General information about macros can be found in NC Macros.
Information about the operating mode can be found in Defining Macros.
Information about Surface Machining macro parameters can be found in Macro Parameters.

All types of macros are available with two exceptions:

  • Clearance is always set to Optimized,
  • Straight is not available for Between passes Link.