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A Helix curve is made first to define the centerline path of the helical surface or solid.
A helical surface is defined with the SWEEP tool using a helical curve as the guide and a profile typically defined in a sketch. This profile can be any shape (circle, square, polygon, etc.)
A helical solid is defined with a RIB or GROOVE. The helical curve is used as the center curve, and a sketch defines the profile. Again, the profile can be any shape, but it probably should be a closed shape.
in the lab of my college ,my prfsr make one like this and then he make it flat with a taper angle of 89 and looks as a hexagonel coil, after that i tried it ,,bt i cant get it ,but he is not willing to teach it us