More Tubes
A hands-on exercise — add the cross rails that tie a drivetrain frame together, using Extrude and Tubify.
01
The Drivetrain Takes the Hits
The drivetrain is the frame the whole robot rides on — and it takes every bump on the field.
- It's usually built almost entirely from 2x1 box tube (WCP).
- Long side rails run front-to-back; cross rails tie them together.
- Those cross rails are what keep the frame square and rigid under impact.
FUSION 360 · SCREENSHOT
add → course-shots/1a-s1-05/1.png
FIG 1
02
EXERCISE: CREATE 2 BOX TUBINGS
You're job is to sketch out two 10x2x1 box tubings and tube convert them into real tubes
- Create a new file
- Sketch and Extrude a blank where each box tube belongs
- Run Tube convert on each blank to turn it into a real 2x1 tube.
- There won't be a step by step guide, so good luck!
Use the SAME Tubify settings (2x1) you used on your first tube — consistency keeps the whole frame matching.
03
What “Done” Looks Like
When you've created both tubes, it should look like this:
FUSION 360 · SCREENSHOT
add → course-shots/1a-s1-05/3.png
FIG 3
Recap
DRIVETRAIN CROSS RAILS
- Cross rails tie the side rails into a rigid frame
- Extrude a blank, then Tubify it into 2x1
- Reuse your 2x1 Tubify settings for a matching frame
- No overlaps — real tube can't share space
Your Task
Build this
- Model what this lesson covers in Fusion 360.
- Use the AltSkripts tools where they apply.
- Save it with a clear name.
How to submit
- In Fusion: Share → Public Link → Copy.
- Paste the link below.
- A coach reviews it in AltHub.