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How can I get a curve on screw shape/line ? Is it possible in Blender ? I made the mesh above in the picture by screwing an hexagon (circle with 6 edges).

But this way, it is hard to work on its edges without deforming it. So far result:

enter image description here

My aim is to make like metal part in picture below. So it would be easier with curve modifier.

enter image description here

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Try adding bevel and taper to the spiral curve like this (of course smooth shading and subsurf will help).

starting with a setup like this:

enter image description here

you can get something like that shape using bevel, bevel object and taper to the shown curve circle:

enter image description here

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You may achieve it using Extra Objects (Curve) add on, then beveling a curve and edit it with a proportional editing.
enter image description here

Activate the add on in User Preferences (Ctrl+Alt+U). enter image description here

Go to Add-->Curve-->Spirals.
enter image description here

Play with a spiral's settings in a Tool Shelf (T). enter image description here

When you're done keep extruding the bottom segments of a curve to create vertical part of a corkscrew. Add a Bezier Circle and use it for beveling the curve. enter image description here

Finally enable the proportional editing, select the very end segment of a spiral, then press Alt+S to adjust its bevel radius. Use Mouse Wheel to adjust the influence of proportional editing. To make the end of the spiral sharp select the last curve's segment and press Alt+S, 0. enter image description here

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  • $\begingroup$ Thank you very much for detailed explanation. I was just not so familiar with spiral curves as i am new on Blender. Also i wanted curve go down with not decrasing radius and i figured it was logarithmic curve sprials. :) $\endgroup$ – Mehmet Oct 28 '17 at 18:22

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