How do I start and end this thread?

[Anonymous]

I'm trying to design the neck of a soap dispenser. I found the spec in the 4th page of this document: https://www.thecarycompany.com/media/pdf/specs/68W26B.pdf. I created the thread, but it starts and end on a wall, not a smooth transition from the shaft:

How can I make it start smooth, emerging from the central shaft?

Here's my model: https://a360.co/3r2JSAK

[MRWakefield · Accepted solution]

The way I do it is this:

1. Select the end face of the thread
2. Create a sketch
3. Project the end face to the sketch
4. Add a revolve axis
5. Create a revolve of an appropriate angle using the projected profile and the axis

See attached.

Hope this helps.