how build helicoid surface?

Want to build good surface.
basic data:
angle of spiral 45 deg
band width - 100 mm

my wrong model heli|coid surface

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2 Answers

From your model I could not really tell what the desired shape was.
Looking for Helicoids online, there are many images:

I have a feeling this model differs quite a bit from yours, so it could be wrong.
Do you have an image or sketch of what the final shape should look like?

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I managed to draw a helix on a surface cylinder only by performing a swept material removal (helix) on a volumic body and then I made a surface shift of value 0.

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