Surfaces and Curves Geometry

Drive surface definition

The Drive surface section enables you to define the surface to be machined in the operation. Choose the appropriate geometry from the list or define a new one by clicking New . The Select Faces dialog box is displayed. This dialog box enables you to select one or several faces of the SOLIDWORKS model. Click on the appropriate model faces. The selected faces are highlighted.

To remove selection, click on the selected face again or right-click the face name in the list (the face is highlighted) and choose Unselect from the menu.

When transferring model files from one CAD system to another, the direction of some of the surface normals might be reversed. For this reason, SolidCAM provides you with the capability to display and edit the normals of model surfaces during the geometry selection.

The Show direction for highlighted faces only check box enables you to display the surface normals for the specific highlighted faces in the list.

The Show direction for selected faces check box enables you to display the normals direction for all the faces in the list.

SolidCAM enables you to machine surfaces from the positive direction of the surface normal. Sometimes surfaces are not oriented correctly and you have to reverse their normal vectors. The Reverse/Reverse All command enables you to reverse the direction of the surface normal vectors.

Drive surface offset

The Drive surface offset parameter enables you to define a machining allowance for the drive surface. The machining is performed at the specified distance from the drive surface.

The offset is three-dimensional and expands the faces in every direction.

Define angle by

This section enables you to define the angle of linear and hatch machining. The angle can be defined by entering its value in the edit box or by picking a line on the model. The angles entered are relative to the XY plane.

This option is available only in the Linear and Hatch modes of the Parallel cuts strategy.

Edge curve

This section is available only for the Parallel to curves strategy.

The Edge curve section enables you to define the lead curve for the operation using the Geometry Edit dialog box. This dialog box enables you to define wireframe geometries by picking edges and vertices on the SOLIDWORKS model.

You can also use multiple curves for multiple surfaces. Each curve is applied only for the nearest surface.

The lead curve must be located exactly on the surface edge; otherwise, a wrong tool path can be generated.

Edge surface

The Edge surface section enables you to define the check surfaces geometry for the tool path generation.

The drive and check surfaces have to be adjacent, i.e. they must have a common edge.

Lead curve

This section is available only for Perpendicular to curve technology, which enables you to generate the tool path orthogonal to the Lead curve defined in the Geometry section.

When the selected curve is not a straight line, the cuts are not parallel to each other.

The lead curve geometry does not have to be located on the surface. During the tool path calculation, SolidCAM generates in each point of the lead curve virtual points on the curve. The distance between these points is determined by the Step over value. SolidCAM projects these points onto the drive surface; the direction of the projection is the normal vector of the curve at the virtual point. Where the normal vector intersects with the surface, a virtual surface point is generated. The passes are generated through these points, normal to the lead curve.

If the cuts cross each other at the edge of the surface, caused by a inappropriate lead curve, you will not get an acceptable result.

The lead curve must be located exactly on or above the drive surface. If the curve is not located above the surface, no tool path is generated. When only a part of the lead curve is located above the surface, only where the normal vector of the lead curve intersects with the drive surface a tool path is generated.

Start and End edge curve

The Morph between two boundary curves creates a morphed tool path between two leading curves. The generated tool path is evenly spread over the drive surface.

The Start edge curve and End edge curve sections enable you to define the leading curves for the morphing using the Geometry Edit dialog box.

It is recommended to choose the Drive surface edges as the lead curves geometry to get better morphing of the tool path.

Start and End edge surface

The Morph between two adjacent surfaces technology enables you to generate the morphed tool path on a drive surface enclosed by two check surfaces. The tool path is generated between the check surfaces and evenly spaced over the Drive surface.

The Start edge surfaces and End edge surfaces sections enable you to define the check surfaces geometry for the tool path generation.

The drive and check surfaces have to be adjacent, i.e. they must have a common edge.

Projection curves

This section is available only for the Projection technology (User-defined and Offset strategies). This technology enables you to generate a single tool path along a curve and can be used for engraving.

Max. projection distance

When the User-defined strategy is chosen in the Projection technology, the system expects to get projection curves lying on the drive surfaces.

Due to tolerance issues in CAD systems, sometimes the curves do not lie exactly on the drive surfaces. This error can be compensated by the Maximal projection distance value. For example, if the value is 0.1 mm, it allows to have the projection curve 0.1 mm away from the drive surfaces.

Direction

This section enables you to specify the direction to which the curves are projected.

X, Y, Z: The curve direction is defined as parallel to one of the Coordinate system axes.

Line: The projection vector is defined by a line that you can pick directly on the solid model.

Surface normal: This option projects the curve into the normal direction of the surface below.

If the curve/pattern lies exactly on the face, the tool path has same shape and position as the curve.
If the curve/pattern lies above the drive surfaces, the tool path changes. The tool path is built only on an interval between those normals that intersect the curve.

The projection has to lie within the Max. projection distance to the drive surface, otherwise the curves cannot be considered for projecting.

Center point

For Spiral/Radial strategies, SolidCAM creates a spiral/circular pattern, which is then projected on the drive surface. The parameters of the virtual circle are defined in the Geometry section.

The Center point section enables you to define the position of a circle center point. It can be defined manually by entering the coordinate values in XYZ field, picking the point directly on the solid model using , or automatically by selecting Auto detect.

Radius

The radial pattern is defined by inner and outer circles projected on the drive surface.

The radius of the inner circle is set by the Start value.
The radius of the outer circle is set by the End value.	Spiral	Radial

The Auto detect option enables you to detect the required maximum radius to machine the surface automatically.

Angle

This option enables you to use only a sector of the radial tool path defining two angles.

The Start angle defines the angle between the initial radius and the sector start.
The End angle defines the angle between the initial radius and the sector end.

Offset

This section enables you define the rule for creating offsets from the Projection curves.

Direction

This option enables you to set where the offsets are created: on the Left, Right, or Both sides of the projection curve.

Number of left cuts

This value defines how many cuts are machined on the left side of the projection curves.

Number of right cuts

This value defines how many cuts are machined on the right side of the projection curves.