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I got two good answers to my previous question about using a profile to create a mesh. The problem I am still having is that I can't get the axis of rotation in the right place. One thread said to position the 3D Cursor on the axis and another said to move the axis to the Origin. I redid this three times. The last time was the closest. Still, the axis of rotation varied from ideal. How do I position the 3D cursor more accurately so as to make the axis of rotation where I want it to be? enter image description here

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    $\begingroup$ Select a vertex and press Shift+S > Selection, see if that helps $\endgroup$
    – J Sargent
    Commented Feb 9, 2015 at 20:20
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    $\begingroup$ See blender.stackexchange.com/questions/1291/… $\endgroup$
    – iKlsR
    Commented Feb 9, 2015 at 20:25
  • $\begingroup$ The screw modifier simply uses the object's origin as the point of rotation, this answer shows how to reposition an object's origin. $\endgroup$
    – PGmath
    Commented Feb 9, 2015 at 22:12
  • $\begingroup$ Just wondering : are you talking about the screw modifier (that uses object axis and rotates around the object's origin) or the spin tool (wich is rotating around the 3D cursor using view axis)? $\endgroup$
    – Bithur
    Commented Feb 10, 2015 at 11:23

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The modifier uses the objects (local) axis (X, Y, Z)

Modeling from top side or front ortho view will make things simple. use numpad5 to switch orthogonal/perspective view

Shape modeled in top ortho view (green line is Y global axis)

enter image description here

Screw modifier set on Z object axis

enter image description here

Screw modifier set on Y object axis

enter image description here

Once modeled, you can move your object or rotate it (object mode) but in edit mode, you'll get a mess. Apply modifier or clear rotations for editing.

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  • $\begingroup$ @ideasman42 Good point, thx for edit. $\endgroup$
    – Bithur
    Commented Feb 9, 2015 at 21:31

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