Create multi-pitched helical sweep

Inventor R11 now includes the ability to easily create a multi-pitched helical sweep. Create an extruded cylinder as a surface e.g. 10mm dia x 100mm high Create a sketch tangent to the cylinder face. On the sketch create a line that is colinear with the end of the cylinder. The sketch then needs to include all the pitches, the horizontal length of the line should be the circumfrence of the cylinder (31.42mm) and the verticle pitch of the line should be the helical pitch. Exit the sketch once complete. Create a new 3D Sketch and select Project Curve to Surface. Choose the cylinder face as the face and then select the individual parts of the sketch you wish to project as the Curve. Make sure you select Wrap to Face (third icon along) hit apply..... You're 2D sketch will now be wrapped as helix around the cylindrical surface. Use boundary patch to close the cylinder, stich it together and you now have a solid that has a 3D multi-pitch helical sweep wrapped around it. Use the updated tools in Sweep to cut your path.