I search around and did not find this question on these forums.

I am trying to create a swept "cork-screw" (I'm actually using a rectangular closed profile but we can stick with a circle at first) that starts out thick at the bottom and ends at a sharp tip at the top of the helix. I was hoping I could use Equations to vary the diameter of the swept sketch as a function of the Z coordinate, but I cannot figure out how to insert the Z coordinate into the equation. Solidworks shows a file property variable "SW-Pz" which I assumed meant "Position on Z" but I get a syntax error and the equation fails. SW help menus aren't very helpful as well.

Any one have tips or a different method? Thanks in advance.

James,

Have you tried using the variable pitch option when you make your helix? You can adjust the diameter as well as pitch. Double click on the feature and all the various dimensions show on screen (or check Display Annotations & Show Feature Annotations). Double click a dimension and plug in your equations as with any other feature dimension.

You might also want to have a look at "Curve Through XYZ Points. . ., or an Equation Driven Curve.