The Spinal Bend tool bends a solid or quilt about a curved spine by continuously repositioning cross sections along a curve. If you’re not familiar with it, you can use spinal bends for creating advanced complex geometry (like the turbo scroll in the video example below) or even something as simple as modeling an engaged zip tie in an assembly. If you are already familiar with the tool, note that the UI and some capabilities have been enhanced in Creo 3.0.
Solid before spinal bend.
Solid after spinal bend. (Notice that the system extends the length of the rod to match the length of the spine.)
By default, the Spinal Bend tool bends selected geometry along a spine to match the length of the spine. If the spine is longer than the geometry, the geometry is stretched along the spine (see image above). If the spine is shorter than the geometry, the geometry is compressed along the spine. Also by default, the tool bends all of the selected geometry.
That said, many interesting options exist for modifying these default behaviors. For example, you can limit the length of the bend, bend just a portion of the geometry, or remove unbent geometry. The following steps and video describe how.
To Create a Spinal Bend
Before you start, note that the spine must be C1 continuous (tangent). If the spine is not also C2 continuous (curvature continuous), the feature surfaces might not be tangent. The plane that passes through the start point of the spine and is normal to the spine must intersect the original quilt or solid feature. To create a spinal bend, follow these steps:
Spinal Bend tab. Note cursor points to “specified depth” icon described in step 3 below.
To see how it works, watch this short video.