Hello Community,

I am having problems with a swept cut for this thread profile called "buttress casing".  I was just meaning this part as practice to develop a process to draw up these threads.  I am wanting to have the profile swept across the tapered helix.  When I go to sweep the profile across the helix, the helix turns pink and will not complete the task.  If you all could take a look at this I would appreciate it.  I am sure that it something simple, but I have run into many problems using a thread profile cut before with solidworks.

Attached is the model, let me know what you think...

Thanks,

Kam