Draft sheet

Menu access: Shape | Other shape | Draft sheet

Description:

Allows to create a draft surface from a curve, a reference direction and points with associated draft angle values.

General philosophy:

1. Select the reference curve (or face in the "silhouette" mode).

2. Choose the reference direction (represents the shake-out direction).

3. Specify the angles values and the associated point (only on the "curve" mode)

4. Give a length or a trimming plane to define the height of the surface.

5. Validate with  OK .

Available option(s):

The option  Draft on = CURVE  or  SILHOUETTE  allows you to choose the reference element used to create the draft sheet:

• CURVE : The draft sheet is created from a curve and points with associated daft angle values.

• SILHOUETTE : The draft sheet is create from the silhouette curve of a face with a constant draft angle in comparison with the reference direction.

The silhouette of the face is computed by using the reference direction and the angle value.

See also Curve | Other curve | Silhouette for further explanation about silhouette curves.

The option  Mode = LENGTH  or  PLANE  allows you to choose the way the length of the draft sheet is defined:

• LENGTH : The length of the surface is define by a value measured along the reference direction.

• PLANE : The draft surface is extended up to a planar face or a plane.

In this mode, the  THROUGH POINT  button allows you to select a passing point for the plane and a reference plane (or planar face) to set the orientation of the plane trough this point.

The computation of the draft sheet is made in two steps (transparent for the user): Computation of intermediate sections, then creation of a Loft surface from these sections.

So, the button  MAKE SECTIONS  allows to generate the intermediate sections. This feature can be useful in two cases:

• The draft sheet is not created, usually due to an self intersection area : generating the sections allows to visualize where the problem is.

• The draft sheet does not give the expected result: generating the sections allows you to delete or modify the bad ones and create manually the loft surface.

The option  Curves = VISIBLE  or  INVISIBLE  allows you to hide or not the reference curve once the draft sheet is created.

Example(s):

Specific point(s):

Once you selected the reference direction, two red arrows appear on the curve.

• The first one (parallel to the reference direction) indicates the side on which the surface will be created.

• The second one (perpendicular to the reference direction) indicates the side on which the draft will be made.

You can invert the direction of the arrows by clicking on them.

Available modification(s):

By using the "modify" function you can:

• change the direction,

• modify the angles values,

• delete value points,

• change the mode (length or plane).