ACCEPTED SOLUTION
Accepted Solutions
The easiest way is to add a feature (cut or add on) at the proximal and distal ends of the helical sweep that create the taper to "zero" or the shape you require. There are more sophisticated ways using graph driven features and the trajpar parameter in the helical sweep sketch but IME it is not worth it. Using separate features to create the terminus geometry of the sweep is easier to manage changes to the model and is often more robust when another user interacts with the model.
If the example below is not suitable for the geometry required on your model, post additional details on what you need.
This shows an example of a swept cut at the end of the helical sweep thread profile. This is for an injection molded thread geometry.
The easiest way is to add a feature (cut or add on) at the proximal and distal ends of the helical sweep that create the taper to "zero" or the shape you require. There are more sophisticated ways using graph driven features and the trajpar parameter in the helical sweep sketch but IME it is not worth it. Using separate features to create the terminus geometry of the sweep is easier to manage changes to the model and is often more robust when another user interacts with the model.
If the example below is not suitable for the geometry required on your model, post additional details on what you need.
This shows an example of a swept cut at the end of the helical sweep thread profile. This is for an injection molded thread geometry.
It looks fine. If it captures your design intent, then you should be good. If there are DFM considerations or functional requirements for the geometry make sure you captured them.
Here is another example of a molded thread where the ends are driven by mold design considerations to be able to unwind the core to eject the part. It uses a helical sweep to get the geometry as needed. The main helical sweep is to capture the thread spec requirements and the second is to reduce to practice a molded version of the specified thread.
Here is another option. By varying the curve you are following you can cause it to taper. Your design intent will drive the method you use.
