I have a question about Acme screws and nuts. Is there are standard chamfer angle used on the ends of Acme-threaded screws and on the opening of the mating nuts? Is there a standard for treating where the threads end? I had a request to show how to draw a detailed screw and nut in SketchUp. The requester is interested in drawing up some threaded thing for 3D printing so I'd like to show finishing the ends correctly. Here's the screw I've got so far.
I put a 14.5° chamfer on the ends but it leaves the end of the thread quite sharp which I expect in reality would be problematic.
Normally I don't care about such details because I only need to show that something is threaded. I never bother with internal threads since they don't show but, this is an exception.
Thanks in advance.