Robot Cart v2 · Project X002
A smaller, lighter revision of the original robot cart using more FRC COTS structure.
Overview
Robot Cart v2 was a second pass at the original X002 Robot Cart. The first version solved several team logistics problems, but it was large, expensive, and used a lot of 80-20, plywood, custom gussets, and extra storage that made the cart harder to move and transport.
The v2 design focused on simplifying the cart around the features the team actually needed most: robot transport, storage for 3 batteries, X003 Driver Station storage, tool storage, and adjustable robot standoffs. It also used more modern FRC COTS components, especially with the release of the REV ION ecosystem and 2x1" MAXTube.
Outcome
X002 Robot Cart v2 was a more focused and practical revision of the original robot cart. It kept the features that mattered most to competition flow while removing the parts of the first version that made it too large and expensive.
The final concept was smaller, lighter, cheaper, and easier to maneuver while still supporting robot transport, battery storage, driver station storage, and organized tool storage.
Problem & Goal
The original cart was useful, but it had grown too large and expensive. Bumper storage made the footprint bigger than necessary, and the 80-20 and plywood-heavy structure added cost, weight, and complexity.
The goal of v2 was to keep the competition workflow improvements from the original cart while making the design cheaper, lighter, easier to build, and easier to move around at events.
Design Requirements
- Reduce cost compared to the original X002 cart
- Reduce part count and simplify the structure
- Shrink the cart for easier maneuvering and transportation
- Keep built-in storage for 3 batteries
- Keep X003 Driver Station storage in the handle area
- Remove bumper storage to reduce the overall footprint
- Add space for a 26" Husky tool chest
- Add a rectangular cutout for 3D-printed tool and item inserts
- Replace 80-20 and 2x4 standoffs with 2x1" MAXTube
- Keep variable-width robot standoffs for different robot sizes
- Use more FRC COTS items where possible
Process
- 1Reviewed the original X002 cart and identified what made it too large or expensive
- 2Kept the most useful features: battery storage, driver station storage, and adjustable robot supports
- 3Removed bumper storage to reduce the cart footprint
- 4Replaced 80-20 and 2x4s with 2x1" MAXTube
- 5Redesigned the robot standoffs around punched tube adjustment
- 6Added room for a 26" Husky tool chest
- 7Added a rectangular cutout for future 3D-printed storage inserts
- 8Reduced plywood and custom gussets where possible
- 9Modeled the revised cart in SolidWorks
Technical Decisions
- Used 2x1" MAXTube to reduce cost, weight, and part count
- Used more FRC COTS structure instead of relying on 80-20 for the full frame
- Removed bumper storage because it made the cart too large
- Made the handle fixed to simplify the design
- Kept storage for 3 batteries because it directly improved match readiness
- Kept X003 Driver Station storage so the driver station stayed with the cart
- Added space for a 26" Husky tool chest to organize tools and match support items
- Added a cutout for 3D-printed inserts so the storage layout could be customized
- Replaced 2x4 robot standoffs with adjustable MAXTube standoffs
- Used thumb screws and punched tube holes to keep robot support width adjustable
- Reduced plywood and custom gussets to make the cart easier to build
Major Changes from v1
| Area | X002 Original Cart | X002 Robot Cart v2 |
|---|---|---|
| Main structure | 1010 80-20, plywood, 2x4s, custom plates | 2x1" MAXTube and fewer custom parts |
| Bumper storage | Included red and blue bumper storage | Removed to shrink the cart |
| Handle | Removable handle | Fixed handle |
| Robot supports | Adjustable 2x4 standoffs | Adjustable MAXTube standoffs |
| Tool storage | General space for tools and first aid kit | Dedicated space for a 26" Husky tool chest |
| Custom parts | More plywood and custom gussets | Reduced plywood and custom gussets |
| Design focus | Maximum storage | Lower cost, lower part count, easier transport |
Structure and Materials
The biggest design change was replacing the 1010 80-20 and 2x4 structure with 2x1" MAXTube box tubing.
This made the cart more aligned with common FRC construction methods after the release of REV ION. MAXTube also made the structure easier to adapt because the punched hole pattern could be used for mounting, adjustment, and bracket placement without needing as many custom gussets.
Battery and Driver Station Storage
The cart kept built-in storage for 3 robot batteries because that was one of the most useful features from the original design. Bringing multiple batteries to the field helped reduce trips back to the pit and made the team more prepared between matches.
The handle area also kept storage for X003 Driver Station, allowing the team to transport the robot, batteries, tools, and driver station together as one field-side system.
Tool Chest and Insert Cutout
Instead of spreading tools loosely across the cart, v2 added room for a 26" Husky tool chest. This made the cart more useful as a compact pit-to-field support station.
The design also included a rectangular cutout where 3D-printed inserts could be added to hold tools, parts, or other frequently used match equipment. This gave the team flexibility without needing to redesign the entire cart for every storage change.
Adjustable MAXTube Robot Standoffs
The original cart used adjustable 2x4 robot standoffs. In v2, these were replaced with 2x1" MAXTube standoffs.
The standoffs still kept variable-width adjustment. Instead of sliding 2x4s on 80-20, the team could loosen thumb screws and move the standoffs to different holes in the punched MAXTube. This kept the cart reusable across different robot sizes while making the support system cleaner, lighter, and easier to fabricate.
Removed Bumper Storage
Bumper storage was removed because it made the original cart too large. While storing bumpers on the cart was useful, the extra footprint made the cart harder to maneuver and transport.
Removing bumper storage helped shrink the cart and made v2 more focused on the highest-value items: robot transport, batteries, driver station storage, and tools.
What I Learned
- How to improve a design by removing features instead of adding more
- How second versions can reduce cost, size, and complexity
- How to use newer FRC COTS systems like REV ION to simplify fabrication
- How MAXTube can replace heavier or more expensive structure in support equipment
- How to design adjustable robot supports using punched tubing
- How storage decisions affect transportation, maneuverability, and event workflow
- How to balance convenience, cost, and physical footprint in a real team logistics project
