Mold Design and Casting > Mold Design and Casting > Creating Mold and Cast Features > Tangent Draft > Reference Curve Requirements for Curve-Driven Tangent Drafts
Reference Curve Requirements for Curve-Driven Tangent Drafts
In order to create a curve-driven tangent draft, you must first create a reference curve. The reference curve must be continuous, tangent, and non-intersecting. It can be created as a sketched curve, a parting curve, or a silhouette curve with offset.
The reference curve must lie outside of the reference part. Normally, it lies in the parting surface, but this is not necessary, unless you create a solid one-sided draft. However, the reference curve must be visible along the Pull Direction from both sides of the part.
The following example shows the correct placement of the reference curve.
1. Reference part (side view)
2. Reference curve (viewed on end)
3. Pull Direction
The next example shows an incorrect placement of the reference curve, because if you look from the bottom of the part along the Pull Direction, the reference curve is obscured by part geometry.
1. Reference part (side view)
2. Reference curve (viewed on end)
3. Pull Direction