solidwork, Helix and Spiral
You can create a helix or spiral curve in a part. The helix can be used as a path or guide curve for a swept feature, or a guide curve for a lofted feature.
To create a helix or spiral:
Open a sketch and sketch a circle. The diameter of this circle controls the diameter of the helix (except in variable pitch helixes).
Click Helix and Spiral on the Curves toolbar, or click Insert, Curve, Helix/Spiral.
Set values in the Helix/Spiral PropertyManager.
Click OK .
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