About the Draft Feature
The Draft feature adds a draft angle from -89.9° to +89.9° to individual surfaces or to a series of surfaces. You can draft any planar surface, cylinder, tabulated cylinder, cone, or ruled surface, except for those that are perpendicular to the pull direction. To access the Draft feature, click > 
Draft.
Draft.You can draft either solid surfaces or quilt surfaces, but not a combination of both. When you select surfaces to be drafted, the first selected surface determines the type of additional surfaces, solid or quilt, that can be selected for this feature. All the selected surfaces must be from a single body or a single quilt.
For drafts, the system uses the following terminology:
• Draft surfaces—The surfaces of the model that are being drafted.
• Draft hinges—Chains of edges or curves, or planes, quilts, or round or chamfer surfaces, that the draft surfaces are pivoted about. These are also called neutral curves.
◦ When a draft hinge is defined by selecting a plane or quilt, then the draft surfaces are pivoted about their intersection with this plane, or by selecting individual curve chains on the draft surfaces. Neutral curves that are selected or found as intersections with a neutral plane can be located anywhere on the surfaces, that is within the existing contours or on an extension. For a neutral quilt, all the draft surfaces must intersect the quilt within the existing contours of the surfaces and quilt.
◦ When a draft hinge is defined by selecting a round or chamfer, the round or chamfer must be adjacent to one single draft surface.
• Pull direction (also called draft direction)—Direction that is used to measure the draft angle. This is usually the direction of a mold opening. You can define it by selecting a plane (in which case the pull direction is normal to this plane), a straight edge, a datum axis, or an axis of a coordinate system.
The pull direction also defines the order of the sides in a split draft. The first side is the side of the split object in which the arrow is pointing. When you flip the arrow, the other side becomes the first side.
• Draft angle—The angle between the pull direction and the resulting drafted surfaces. If the draft surfaces are split, you can define two independent angles for each side of the drafted surface. Draft angles must be within the range of -89.9° to +89.9°.
Draft surfaces can be split either by the draft hinge, a quilt, or a sketched curve. If you are splitting by a sketch, the system extrudes it to a quilt within the draft feature, in the direction normal to the sketching plane. If the draft surfaces are split, you can:
• Specify two independent draft angles for each side of the drafted surface.
• Specify a single draft angle, with the second side drafted in the opposite direction.
• Draft only one side of the surface (either one), with the other side remaining in the neutral position.
When the surfaces to be drafted include rounds, you can either preserve the rounds, and they remain rounds, or you can draft the rounds, and then they become conic.
If you propagate a draft, the system expands the selection of surfaces to be drafted. Surfaces that meet these conditions are propagated to the draft:
• Connected by a tangent edge or round surface to at least one of the selected or added draft surfaces
• Draftable
• Have the same angle with pull direction as at least one of the selected or added draft surfaces to which it is connected. In a continuous stretch of parallel surfaces, the surfaces are usually drafted together.
When two surfaces are connected by a round surface, the round surface could be added to the draft, depending on the same conditions.
The draft_tan_propagation_default configuration option defines the default of whether to propagate a draft or not. The 
Propagate draft surfaces command defines whether to propagate a draft for the draft feature.
Propagate draft surfaces command defines whether to propagate a draft for the draft feature.