The moment a robot runs, it is no longer just "a circuit on the table": wheels turn, an arm moves, a propeller speeds up. If one line of code is wrong, the machine can move in an unexpected direction. This article is the sixth part of our workshop safety series and explains how to test moving systems safely.
This content is for informational purposes only and does not replace official procedures, equipment manuals, or authorized instructions.
Golden rule: The first test is always done with limited power, wheels in the air, and a clear area around. The sentence "What if we just try it?" can be the most expensive and dangerous one.
Why a separate testing guide?
In our basic rules article we gave a few robotics points. In a real workshop, these things happen:
- While code is uploading, a motor suddenly spins at full speed.
- The robot falls off the table; a board or sensor breaks.
- A finger gets caught between a gear and the chassis.
- A servo arm hits a face or an eye.
- A drone propeller cuts a hand.
Know the pinch points
| Zone | Risk | Protection |
|---|---|---|
| Gear pair | Fingers and hair pulled in | Fit a cover/guard; do not touch while running |
| Belt – pulley | Crushing, scrapes | Do not adjust tension by hand while running |
| Wheel – chassis gap | Pinching | Hold the robot by the body, not the wheel |
| Robot arm | Impact, eye injury | Mark the work area; stand at a safe distance |
| Propeller | Cuts | Use a test cage / secured fixture |
A safe test setup
- Set up a test stand: Raise the robot on books, blocks, or a stand so the wheels spin freely.
- Clear the area: Do not leave cups, pens, or phones on the table. Broken belongings matter as much as a fallen robot.
- Warn out loud: Before you run it, say "Test starting!" Everyone pulls their hands back.
- Gradual speed: On the first try keep motor power low (e.g. 30 percent), then increase.
- One variable: Do not change both code and mechanics at once; finding the fault gets hard.
- Keep notes: What was tried, what happened? A test log helps both safety and reports.
Main switch and emergency stop
- Every moving project should have an easy-to-reach switch or a detachable battery connector.
- The switch should not be on the side the robot will move toward; put it where your hand can reach safely.
- While uploading code, disconnect motor power. USB may power the board; it should not drive the motors.
- During a test, one person should be tasked only with stopping.
- Do not try to catch a runaway robot by hand; cut the power.
Cables, weight, and tipping
- Neaten cables; a cable wrapped in a moving part damages both the robot and the board.
- Place batteries and heavy parts low and centered; high weight causes tipping.
- Check screws regularly; vibration loosens them.
- Soften sharp metal edges with a file or tape.
- When carrying a robot, turn it off first; do not carry a powered-on robot in your arms.
Drones and flying projects
- Propellers are fitted only in the test area and with goggles on.
- Calibration and motor tests are done without propellers.
- Flight only in areas the school allows, never over people.
- For battery rules, see our "Electricity and Battery Safety" article in the series.
- Before flight, check the surroundings: no glass, lamps, people, or animals.
Competition and tournament day
Crowds, noise, and excitement make rule-breaking easiest.
- Take the robot to the field powered off; turn it on on the field.
- Work only in the repair area; do not solder in the corridor.
- Do not touch another team's robot without permission, and do not let others touch yours.
- Charge batteries only with the designated charger and in a suitable place.
- Do not test toward the spectator area.
What to do if something happens
- Cut power: Close the switch, connector, or main power.
- Pinch: Do not force the part out; free the mechanism and call the teacher.
- Cut / scrape: Press with a clean cloth and tell the teacher.
- Hit to the eye: Tell the teacher without rubbing; if complaints continue, go to a health facility.
- Fallen robot: People first, then parts. Do not touch a broken battery pack.
Quick checklist
- Are the wheels in the air / is the robot on a stand?
- Is the area clear and everyone warned?
- Is the main switch under my hand?
- Is motor power disconnected while uploading code?
- Are gear and belt guards in place?
- Are cables tidied and screws tight?
- Did I write the test result in the log?
Related reading
In our series, "Workshop Safety: Basic Rules" and "Electricity and Battery Safety" form the base of this part. In the next part we will cover adhesive, paint, and chemical safety.
Controlled testing means faster progress. Run the robot by planning, not by fear.
