# Tutorial: Wooden snail with variable coss-section

Here is what I came up with. did it the way Jeff suggested by doing a cut-sweep along a helix.

1. ### Step 1:

open a sketch on top plane and make a square.

2. ### Step 2:

extrude the square up to make a cube.

4. ### Step 4:

Make this sketch on the front plane and make the bottom horizontal line colinear with the top of the cube and the left verticle line verticle to the origin.

5. ### Step 5:

do a revolve.

6. ### Step 6:

select the flat face on the top of the revlove and convert entities. this will be the circle we use to make a helix.

7. ### Step 7:

create a helix using the circle. I adjusted it untill it look correct acording the pictures I was trying to duplicate. Make sure the start angle is set to 0 as this will make thing easyer in later steps.

8. ### Step 8:

select the top face of the revolve and open a sketch. use the offset entities to make a circle larger then the flat face.

9. ### Step 9:

take this sketch and do a boss extrude in two directions. one as tall as the helix and the other to the round surface of the revolve.
***Be sure to un-check the merge results. We will merge the two bodies in a later step.

10. ### Step 10:

create a fillet on the front plane and add a point to the right side of it. Pierce this point to the helix. This is why we want to start the helix at 0 deg.

11. ### Step 11:

do a cut sweep with the circle and the helix

*** be sure to go to geature scope and select only the upper cylinder to cut. That is why we wanted two bodies.

12. ### Step 12:

in the upper part of the feature tree there should be a folder that says you have two bodies, open this and select the bodies and a window should come up with a combine icon. use this to make one body. I am not sure where this is in the ribbon.

13. ### Step 13:

add fillets to the edges on either side of the cut sweep. I adjusted this as large as I could to get it to look smooth and rounded.

14. ### Step 14:

on the face at the top the spindle, open a sketch and make a circle centered on the origin and just large enough to cover the profile.

15. ### Step 15:

extrude in two directions.

16. ### Step 16:

on the front plane, make a sketch of a circle and pierc the center of the circle to the bottom edge of the extrude. make sure the top of the circle meets the sketch of the extrude.

17. ### Step 17:

do a cut sweep (you may need to make the sketch from the extrude visable to be able to select it for the path.

19. ### Step 19:

on the top face open a sketch and make a square. I added a mate to the base cube instead of adding dimensions.

20. ### Step 20:

extrude the square up.

21. ### Step 21:

Create this sketch on the front plane. there is a verticle construction line is verticle over the origin and will be used for the axis of a revolve cut. The 175 is the diameter of the upper arc. I had to adjust this sketch a few times after the revolve cut to achieve the desired results.

22. ### Step 22:

do a cut revolve using the verticle construction line as the axis of revolution.

23. ### Step 23:

The revolve cut creates an undesirable space. Select this face and convert entities. This makes a circle to extrude.

24. ### Step 24:

Use the circle sketch and extrude to surface.