Maryland FIRST RoboticsFinding surplus materials for building robots
Finding and using surplus materials for building robots can give FIRST teams more ways to test ambitious ideas without buying every component new. Surplus includes factory overstock, clearance stock, decommissioned equipment, machine spares and useful offcuts. The aim is not to make a robot look cobbled together; it is to create dependable prototypes while keeping cost and waste under control.
A well-sourced part can be as educational as a new one. Teams still need to measure, machine, wire, program and troubleshoot it, revealing engineering and project skills alongside teamwork. This works across FIRST Robotics Competition, FIRST Tech Challenge, FIRST LEGO League and Jr.FLL, although the scale, documentation and supervision must suit each age group.
Australian teams should plan around local conditions rather than simply copying an overseas parts list. Melbourne, Sydney, Brisbane and Adelaide have different maker communities, distributors and workshop networks. Freight across a large country can erase a bargain, so evaluate landed cost, spare-part availability and time to repair. For purchases from overseas, Australian Border Force rules, GST, electrical requirements and battery restrictions may all affect the decision.
Set material goals before shopping
Begin with the robot's required function, not with a pile of appealing leftovers. Write down the mechanism, load, dimensions, operating environment and expected season of use. “Cheap” is useful only when the part can be identified, tested and replaced before competition.
Separate essential items from experiment items. Standard fasteners, wheels and simple drive components may need to be new and readily available; motor mounts, sensor brackets and decorative structures can often be adapted. This prevents valuable workshop time from being spent searching for parts a design can avoid.
Create a simple parts record as you search. Record the source, cost, condition, measurements, electrical ratings and any tests completed. Photos help mentors recognise the same component later, while a clear list reveals whether a local purchase, print, loan or full-price replacement is genuinely the best option.
Find surplus close to home
Start with organisations that already handle equipment: schools, TAFEs, universities, manufacturers, repair businesses, office fit-out firms and approved industrial suppliers. In Melbourne, university labs and fabrication studios can be valuable contacts; Sydney has strong electronics and repair networks; Brisbane and Adelaide also support active maker, agriculture and educational communities. Ask about decommissioned spares rather than discarded production machines.
Local retail can help too. Hardware counters at stores such as Bunnings, along with electrical and electronics distributors, may have discontinued lines, reduced-quantity packs or scratched clearance items. Salvaged aluminium, plywood, tubing and conveyor components can come from fabrication workshops and demolition reuse businesses. Check the dimensions and material grade before buying.
Digital marketplaces such as Gumtree, local e-waste collectors and manufacturers' outlet pages widen the search, but factor in postage and pickup distance. Regional STEM networking illustrates how educators can improve access by sharing contacts and knowledge rather than buying alone. Australian teams can build a similar local exchange through their school, regional robotics community and sponsors.
Keep reuse safe, legal and repeatable
Surplus equipment may have been stored, operated or modified under conditions your team cannot see. Before accepting a component, establish its provenance and whether its previous use creates electrical, structural or contamination concerns. A cheap motor with an unknown history is not automatically a safe training project.
Before a part enters the workshop
- Confirm the material, dimensions, load rating and operating temperature against the design.
- Inspect electrical connectors, insulation and cable jackets; reject exposed conductors or damaged housings.
- Check that fasteners match the correct metric size, grade and length for Australian hardware.
- Record the source, condition, tests and warranty status before modifying the part.
Once parts pass that check, make the test sequence deliberate. Confirm free movement first, then add load gradually while watching current and temperature. Record the operating limits so the next team does not have to rediscover them.
During assembly and testing
- Isolate power while fitting components, and use a correctly rated low-voltage supply or battery.
- Guard rotating parts and test motion at low speed before applying the intended load.
- Measure results such as current draw, heat, backlash and repeatability rather than relying on appearance.
- Quarantine uncertain parts until a mentor or qualified technician verifies them.
For cross-border purchases, check Australian Border Force requirements and prohibited or restricted goods before paying, then allow for GST and delivery. Used machinery can attract extra questions, while lithium batteries have specific transport rules. Keep timber, soil and other biosecurity-sensitive material out of imports unless the applicable rules clearly permit it. Australia’s 230 V mains supply is separate from low-voltage robot power, and altered mains equipment needs appropriate protection and qualified assessment.
Match parts to the best buying option
The best source depends on how critical the component is, how much redesign it creates and whether a matching replacement exists. Compare the total effort involved, not only the purchase price. A modest saving may be poor value if it requires extensive machining, uncertain testing or a rushed redesign.
| Source | Best suited for | Main advantage | Main watch-out |
|---|---|---|---|
| New standard part | Safety-critical structure, common fasteners, standard electronics | Predictable specifications and easy replacement | Higher initial cost |
| Factory surplus | Motors, servos, controllers, sensors and unused mechanisms | Low cost with documented specifications | Limited stock and possible firmware differences |
| Reclaimed component | Shafts, bearings, gearboxes, frames and housings | Often larger or harder to buy new | Wear, corrosion, unknown history |
| Custom-made part | Brackets, guards, adapters and non-standard links | Exact fit and controlled material | Design time and machine access |
| Borrowed prototype part | Early testing of a mechanism or dimension | Low commitment and fast iteration | Must be returned and cannot be relied on at competition |
New parts are usually sensible where failure could injure someone or stop a match without warning. Surplus or reclaimed parts become more attractive for structures that can be inspected, isolated and replaced. A mixed approach often produces the best result: buy essential reliability, reuse robust mechanisms and prototype uncertain ideas cheaply.
Design robots for changing parts
Treat an available part as a design input, not a promise that another identical item will arrive. Measure the actual component, leave clearance for tolerances and use bolts where possible instead of relying on a permanent bond. Standard spacers and common fastener sizes make substitutions faster.
Separate the robot into drive, manipulator, sensor and structure modules. That lets a team replace a motor or revise a sensor location without rebuilding everything. For custom brackets, printable prototypes can confirm spacing, but load-bearing parts should be made from appropriately rated material and verified under working conditions.
Reused electronics need a separate plan. Confirm voltage, pinout, communication protocol, firmware and connector standard; do not fit unknown batteries or mains-powered controllers to a student robot. Keep a known-good controller and essential sensor available, because substituting software and wiring during competition can cost more than ordering a new part.
Document choices and mentor others
A parts register turns a casual purchase into a reusable team asset. Give each component an identifier, then link it to sketches, CAD files, wiring diagrams, supplier notes and test results. Include unsuccessful experiments, since knowing that a material or motor did not work prevents another team from repeating the same cost.
Although written for a different market, the Maryland FIRST Robotics supplier guide demonstrates how a curated local list can help teams find specialist parts and build dependable relationships. Australian teams can use the same format with nearby distributors, makerspaces and industry sponsors.
Mentors should model careful triage rather than doing every build themselves. Let students source options, compare specifications, inspect components and document decisions, while an adult supervises tools, electrical work and workshop access. Recognise procurement, safety checks and mentoring as real contributions to the team's engineering effort, not as support tasks outside the core learning.
Make surplus part of the next build cycle
Unused components should return to a shared inventory rather than disappear into a storage bin. Label bins by material, function and condition, then publish a list that other teams can search. A small parts library can help a community school or regional event obtain a sensor bracket within a day rather than ordering from another continent.
The Maryland FIRST Robotics article on fruit machine strategy shows how an unconventional machine concept can be evaluated against a clear purpose. The same discipline applies to robot builds: identify the useful behaviour, remove decorative complexity and adapt only what improves the mechanism.
Choose one mechanism for your next prototype, record its condition and intended load, and build a short parts sheet before workshop time begins. Assign sourcing, safety checks and fabrication tasks from that sheet, then publish the verified component in the shared inventory for the next build.