7 Replies Latest reply on Dec 22, 2010 12:00 AM by 1-V8OBKM

# How to draw a 3D helix with varying width and pitch?

Hi, I'm a new comer to SW. Now I want to etch a spiral in a tapered tip just as the figure shows below. I know how to draw a single tapered helix but have no idea for this structure.

Are there any method on this subject? Your kind help is greatly appreciated.

Thanks,

Guanghao

• ###### Re: How to draw a 3D helix with varying width and pitch?

Welcome to SW forums Rui.

Check AdvancedHelixShapes if this helps else I'll upload one example.

Also check these post on Square/ Rectangular Helix/spring and you can use the same methods.

Rectangular Spiral?

How I can make a square spiral?

And also read this post: Forum Posting (highlights on how to use forum and ask questions)

• ###### Re: How to draw a 3D helix with varying width and pitch?

Guanghao,

I had to think about this overnight. I have found a good solution:

1. Create a solid cone.

2. Create the helix using the surface sweep method.

3. Create offset distances for the beginning and end of the second spiral.

4. Use split line to turn the surface sweeps into faces on the solid body.

See my attached model for how to create this.

• ###### Re: How to draw a 3D helix with varying width and pitch?

Thanks, Charles, your model enlight me

But this helix is just a surface line, not really etched into the cone with a definite thickness. I have no idea how to use the sweep method to creat a solid helix with varying width.

Any idea?

Thanks

• ###### Re: How to draw a 3D helix with varying width and pitch?

After creating the surface:

1. Select the face.

2. Choose Insert>Surface>Offset Surface.

- Select an offset distance of 0.

3. Select the newly created surface body. Choose "Insert>Cut>Thicken"

This will cut that shape to a depth in the solid body.

• ###### Re: How to draw a 3D helix with varying width and pitch?

You beat me to it Charles. You replied while I was creating the examples.

• ###### Re: How to draw a 3D helix with varying width and pitch?

Guanghao,

You can offset and thicken that surface in Charles' part as needed. This will allow you to make a solid out of the spiral. For the debossed part you will have to play with the ends to get them to come out correctly.

• ###### Re: How to draw a 3D helix with varying width and pitch?

Thanks, Michael, that's very helpful