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This ball metal caster wheel acts as a neutral, unpowered support point on a wheeled robot, most often used as the third or fourth contact point on a two-wheel-drive chassis where the two main wheels handle steering and propulsion. Because the steel ball inside can roll in any direction, it lets the robot pivot and turn without the support wheel fighting against the motion the way a fixed wheel would, making the whole chassis walk or move in a noticeably more flexible and comfortable way.
Unlike the robot's drive motors, this wheel needs no control signal or wiring of any kind; it is a purely mechanical support point that simply needs to be bolted into place at the right height to keep the chassis level.
The base plate measures 27.5mm in diameter, with the caster wheel itself at 13.5mm diameter and 18mm in overall height. The ball is steel, giving it a smooth, durable rolling action across typical indoor floor surfaces, and the whole assembly weighs just 15g, adding minimal extra mass to a small robot. Load capacity is rated from 1 to 5kg, comfortably covering the weight of most small to mid-size hobby robot builds.
Mounting uses three holes, spaced 120 degrees apart, each 3.4mm in diameter, making it straightforward to bolt onto a flat section of a robot chassis using standard small screws.
Anyone building a two-wheel-drive robot that needs a simple, reliable third point of support, such as a line-following robot or small robot car, will find this ball caster a standard, low-cost part for keeping the chassis balanced without adding any steering resistance.
No, it is a purely passive mechanical support wheel.
Steel.
A load capacity of 1 to 5kg.
Through three mounting holes, 3.4mm in diameter, spaced 120 degrees apart.
Because it rolls freely in any direction, letting the robot turn without the support point fighting the motion.
| Brand | Generic |
|---|---|
| Material | Metal |
| Selling unit | PCS |
