The two-arm spirals

[JessicaSimpson]

Hi, I am trying draw a two-arm spirals with varied slit width shows below. But I'm a new comer to SW and have no idea how to draw it.

Are there any method on this subject? All suggestions greatly appreciated.

Thx,

Jessica Simpon

 

[CADFlyer]

I would use the following:

Insert-> Curve-> Helix/Spiral.
Defined By: Spiral

Then I would do a Circular pattern to get the 2nd "arm"

 

[Updraft]

Jessica,

1. Are you trying to model a part or an assembly?
2. Is this spiral flat (planar) or does the spiral grow in diameter as it progresses down an axis?

I suggest you look in the Help for Helix and Spiral to learn how to do this. It really isn't hard. (Hint: Make one spiral and then use a circular pattern to make the second one.)

- - -Updraft

 

[ChrisDuncan]

I don't think SW is going to draw this exact profile automatically with helix/spiral. What you have pictured has a variable (increasing) pitch spiral. Helix/spiral in SW only draws a fixed pitch spiral.

you can get the increase in the profile width by creating two spirals with different pitch on the same base circle and closing the ends, but the gap between the profile rotations gets smaller (from center to outside) not larger as with your picture.