Fins + Booster (page 2) | Onshape CAD Tutorial | Stage One Education

Make the fins

in which we circular pattern the rocket fins

Fins + Booster Tutorial
Previous Page: 1 | 2 | 3 | 4 | Next

7. Start a sketch on the Right plane

Select the sketch tool
Select a sketch plane. Use the Right plane.
Align your view to the sketch plane by clicking "Right" on the view cube

8. Draw the profile of one fin

Select the Use (Line) tool
Start at the bottom, in the middle of the cylinder, and draw the profile of one fin
The exact fin shape can be up to you!
Your fin should have these properties though:
- A flat bottom
- About as wide/tall as these fins

9. Extrude the fin in both directions

Select the extrude tool
Click on Add to add to your part instead of creating a new part
Set the Depth to 0.05 in
Check Second end position
Set the second Depth to 0.05 in
Click the green check

10. Add fillets to smooth out the fin profile

Select the fillet tool
Click the edges on the left, right, top near the body, and top on the fin
Set the radius to 0.4
Click the green check

11. Add fillets to the fin edges

Select the fillet tool
Set the radius to 0.05
Click the two edges of the fin
Click the green check

12. Circular pattern the fins

We have one fin, but we really want 3 fins around in a circular pattern.
Select the circular pattern tool

Select a Feature Pattern from the drop down menu

In the left pane, click on Features to pattern and then select Extrude 2 (the extrude for the fins) and the two fillets we just did

Select Axis of pattern, and then click the the cylinder

Chance the Instance count to 3

Check Apply per instance

Click the green check

13. Create a sketch on top of the cylinder

What we want to do next is clear out the middle of the cylinder, and so we'll make a new sketch to help us get there
Select the sketch tool
Click on top of the cylinder
Notice how a new sketch plane is now on top of the cylinder

14. Use the "Use" tool to get the inner circle in this sketch

Select the use tool
Select the inner circle of the body
To help see what this has done, hide the 3D part
Unhide the part

15. Extrude cut away the inside of the cylinder

Select the Extrude tool
Select Remove to take away rather than add material
Where it says Blind, change it to Through all
Click the green check
Notice how the inside of the cylinder is now perfectly empty

Fins + Booster Tutorial
Previous Page: 1 | 2 | 3 | 4 | Next