Trying to make a worm gear

@kitsushadow

You could follow:

Helix around Cylinder

To create the Four Helixes you need.

Then Sketch, on the Base of the Cylinder, the Four Closed Shapes needed to create the Grooves.
The following demonstrates how it is possible to Tools > Sweep the Four Shapes along the Helixes although NB: The Axis shown will be replaced by the Helixes you create in this case.