What are the reasons creating a thread could fail?

simleek

I tried creating a thread for a screw using a few tutorials. One suggested using any plane and making a triangle to sweep cut from a cylinder. That one didn't work. [The problem just said it was something related to the sketch.] Another tutorial suggested using a point curve plane. That method created part of the thread, but errored out on half the triangle sketch. I modified the sketch, and it was back to not working with sweep at all.

What exactly do I have to do to make a sketch work with sweep?

viru

@joshua_miklos, There may be chances that this failure occuring due to triangle intersected with threaded path (Helix). Therefore you need to reduce number of turns or triangle size (Sweep profile) or you can increase pitch of helix. 
You would need to then build the thread cutting sweep which the approach can be found here:
https://youtu.be/HUMhT9LGQ7U
Please refer below document link which is provided by @greg_wood will helpful to create threaded sweep.
https://cad.onshape.com/documents/9b2d8e3ceaaa017089530828/w/c9d2c49a76958495e6a55ee7

viru

@joshua_miklos, There may be chances that this failure occuring due to triangle intersected with threaded path (Helix). Therefore you need to reduce number of turns or triangle size (Sweep profile) or you can increase pitch of helix. 
You would need to then build the thread cutting sweep which the approach can be found here:
https://youtu.be/HUMhT9LGQ7U
Please refer below document link which is provided by @greg_wood will helpful to create threaded sweep.
https://cad.onshape.com/documents/9b2d8e3ceaaa017089530828/w/c9d2c49a76958495e6a55ee7