Helical sweep is extensively used option in pro engineer for making protrusion or cut outs for screw threads. This option could also be used for making coil springs.
Like sweep, helical sweep also needs to have section and trajectory. But, here you need not to directly sketch the helical trajectory. Instead pro engineer got the helical trajectory from the surface of revolution and the pitch. Surface of revolution defines the distances between centre of threads and the axis of revolution.
Creating helical sweep
Go to insert>helical sweep, you will find the helical sweep dialogue box opened.
Here the following attributes needs to be defined:
Constant: choose this attribute if you are going to model for constant pitch.
Variable: Here the pitch will be variable and will be controlled by a graph. By default the graph will be having two control points but if you want some more control points in the graph, you have to add it while sketching the trajectory.
Through axis: If you wish to pass the plane of the cross section of the profile through the axis of revolution, then go for this option.
Normal to Traj: Here the cross section of the threaded geometry remains normal to the trajectory or the surface of revolution.
Right handed: The threaded geometry will be following right hand direction, means if you place your right hand thumb towards the axis of revolution then the direction of the remaining fingers will show the thread direction.
Left handed: The direction threaded geometry will be following left hand rule.
In the helical sweep dialogue box, you need to define the trajectory and the section now. The trajectory must be open type of geometry. Pro engineer will consider the surface created by revolving the trajectory as surface of revolution of the threads. Make sure that you have sketched a centerline; abut which the threads will be revolved. You can draw any shape of profile, provided it is open and tangent at any point is not normal to the centre line.