Creates a spline in the gap between two selected lines or curves.
Access Methods
Button
Toolbar: Drafting tool set 
Modify tool group Blend Menu:
Modify
Blend
Summary
Select each object near an endpoint. The shape of the resulting spline depends on the specified continuity. The lengths of the selected objects remain unchanged.
Valid objects include lines, arcs, elliptical arcs, helixes, open polylines, and open splines.
List of Prompts
The following prompts are displayed.
Select first object or [CONtinuity]: Select a line or open curve near the end where the spline should start
Select second object: Select another line or open curve near the end where the spline should end
Continuity
Specify one of two types of blends.
- Tangent
-
Creates a degree 3 spline with tangency (G1) continuity to the selected objects at their endpoints.
- Smooth
-
Creates a degree 5 spline with curvature (G2) continuity to the selected objects at their endpoints.
If you use the Smooth option, do not switch the display from control vertices to fit points. This action changes the spline to degree 3, which will change shape of the spline.