Combined Gearbox
Gears AND belts in one box, mounted on tube frame — the capstone gearbox bringing Stage 1A and 1B together.
01
Gear + Belt Gearbox
Combine a gear stage and a belt stage, on real frame.
- Mix everything: tubes, plates, gussets, gears, and belts.
- Two stages: a gear reduction and a belt reduction.
- Drop an origin reference first for the belt math.
FUSION 360 · SCREENSHOT
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FIG 1
02
Frame It
Start with the structure.
- Sketch and extrude tube profiles with 1/8 in assembly gaps.
- Tubify into 1x1 thin-wall (1/16 in) tube.
- Add an L-shaped gusset.
FUSION 360 · SCREENSHOT
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FIG 2
03
The Gearbox Layout
Lay out both stages in one sketch.
- 60T and 20T gears at 2 in and 4.5 in; 12T and 36T pulleys (5 mm).
- Motor circle 2.5 in; use AltSkripts C-C Distance for the belt.
- Plate: bearing holes, 1.5 in motor boss, bolt circle, spacer holes.
FUSION 360 · SCREENSHOT
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FIG 3
04
Build & Assemble
Make the round parts, then put it together.
- 3/8 in spacers and the belt via AltSkripts; shafts via Shaft Endings.
- Optionally Part Lighten the plates.
- Assemble pulleys, belt, gears, motor, bolts, rivets from FRC-COTS.
FUSION 360 · SCREENSHOT
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FIG 4
Key idea
Model the belt's path in the part, joint it once in the assembly.
Design intent saves assembly work.
Recap
COMBINED GEARBOX
- Gears + belts on real tube frame
- Origin reference first for belt math
- AltSkripts C-C Distance + Belt Generator
- Belt needs just one Rigid Joint
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.