Tamiya 70256 Bipedal Walking Robot STEM Build  [70256]

Tamiya 70256 Bipedal Walking Robot - Centre of Gravity Walker

The Tamiya 70256 Bipedal Walking Robot is a tactile STEM project that highlights how shifting weight can generate locomotion. It is designed to teach straightforward mechanical principles through assembly and testing.

Core Design Features

Fabricated from sturdy ABS plastic, the kit uses a weight transfer unit to move by shifting its centre of gravity. A low RPM type 130 motor drives the leg assemblies as the body rocks, making the walking action easy to observe.

Construction and Custom Work

Parts join using both snap-fit and screw methods to give a reliable build. The legs and sliding components have pre-drilled mounting holes so you can add universal shafts or other custom items. Total build time is around two to three hours, with a difficulty rating of 3 out of 5.

Performance and Setup

With a gear ratio of 114.7:1 the model moves at about 4.8 cm/s, which works best on smooth, firm floors. Steering is adjusted by changing the gearbox attachment angle, while leg limiters set lean and step length. An optional guide rod can be fitted to help the robot clear small obstacles.