Gears and transmission
FTC 2026-2027 Arm Picker Robot Assembly
- Bounding box
- 400.0 × 942.9 × 550.0 mm
- Engine
- Precision B-rep
- Parameters
- 43
- Published
- September 12, 2026
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The prompt
goBILDA-based chassis, and the mechanism you’re showing already has several useful ideas: vertical structure, chain/gear transmission, and a front mechanism that could be adapted into an arm/picker. goBILDA has downloadable STEP files for its parts, including its 2026–27 FTC StarterBot resources. What I would design I’d recommend making the CAD as separate components: Main robot chassis Left/right vertical supports Arm pivot Arm Flower pickup mechanism Motor + gear/chain system Hard stops / limit positions Shooter Ball/artifact path from pickup → shooter Mounting points for electronics The most important part is not designing the arm in isolation. We should design the arm and shooter together so the arm doesn't block the scoring mechanism. From your photos, I'd aim for something like: Front → pickup arm reaches the FLOWER → arm retracts toward the robot → game pieces transfer into an internal path → shooter sits higher/back on the robot → shooter launches into the large scoring structure That gives you a much cleaner overall robot than putting a huge arm directly in front of the shooter. For Fusion 360 The workflow should be: goBILDA STEP files → Fusion 360 → assemble robot → design custom arm parts → test movement → export .STEP / Fusion file → share with team goBILDA specifically provides STEP files for its current FTC resources, so we can use the manufacturer's actual geometry instead of recreating every U-channel and gear by handl. I need to create a CAD model for a arm picker upper for this years FTC 2026-2027 competition. Go build has downloadable files of each part. I need to be able to put it on fusion to send to others. This is to score in the flower for the competition. But we need to keep in mind about were to put shooter for the rest of the balls to go inside the big obstacle
Parameters
| Name | Value | Range |
|---|---|---|
| Chassis Length | 400 mm | 300 – 500 |
| Chassis Width | 400 mm | 300 – 500 |
| Chassis Height | 100 mm | 80 – 150 |
| Chassis Wall Thickness | 10 mm | 5 – 20 |
| Chassis Mounting Hole Dia | 5 mm | 3 – 10 |
| Cross Member Width | 20 mm | 10 – 40 |
| Vertical Support Width | 50 mm | 40 – 80 |
| Vertical Support Height | 450 mm | 350 – 550 |
| Gusset Leg Length | 50 mm | 30 – 80 |
| Gusset Thickness | 5 mm | 3 – 10 |
| Arm Pivot Height Above Chassis | 350 mm | 250 – 450 |
| Pivot Shaft Diameter | 30 mm | 15 – 60 |
| Pivot Shaft Length | 260 mm | 150 – 350 |
| Bearing Block Outer Dia | 80 mm | 50 – 120 |
| Bearing Block Width | 40 mm | 20 – 80 |
| Arm Length | 500 mm | 350 – 650 |
| Arm Width | 50 mm | 30 – 80 |
| Arm Height | 20 mm | 10 – 40 |
| Arm Downward Angle | 30 deg | 0 – 60 |
| Pickup Length | 150 mm | 100 – 200 |
| Pickup Width | 100 mm | 60 – 150 |
| Pickup Height | 100 mm | 60 – 150 |
| Motor Length | 100 mm | 70 – 150 |
| Motor Width | 80 mm | 50 – 120 |
| Motor Height | 80 mm | 50 – 120 |
| Small Gear Dia | 40 mm | 20 – 80 |
| Large Gear Dia | 80 mm | 40 – 150 |
| Gear Width | 10 mm | 5 – 25 |
| Chain Width | 10 mm | 5 – 20 |
| Chain Thickness | 3 mm | 1 – 6 |
| Hard Stop Block Size | 20 mm | 10 – 40 |
| Shooter Length | 200 mm | 150 – 300 |
| Shooter Width | 150 mm | 100 – 200 |
| Shooter Height | 150 mm | 100 – 200 |
| Flywheel Diameter | 80 mm | 40 – 120 |
| Flywheel Width | 20 mm | 10 – 50 |
| Ball Path Length | 300 mm | 200 – 400 |
| Ball Path Width | 80 mm | 50 – 120 |
| Ball Path Height | 30 mm | 15 – 60 |
| Ball Path Wall Thickness | 3 mm | 1 – 8 |
| Electronics Plate Length | 200 mm | 150 – 300 |
| Electronics Plate Width | 150 mm | 100 – 200 |
| Electronics Plate Thickness | 5 mm | 2 – 10 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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