It is difficult to make this accurately as it involves a 3D cutting tool. Traditionally, the physical parts are made on a lathe with a milling attachment.
You can make a reasonable representation using the helical sweep function. You can scribe a trajectory using a wrap feature. Use the math for circumference to attain the accurate angles in a flat sketch. Be sure to add a coordinate system to your sketch!
Some tips here: Closed and Ground Spring - Alternative to Helical Sweep
You may also have some luck using the Offset feature.
A very lengthy discussion on 3D tool emulation may be gleaned in this discussion:
Modeling a globoidal cam
Also: Video Link : 5595
