Product Description
The express is equipped with a crank and piston mechanism (crank train). It is commonly employed in cars and has a fascinating history. Initially introduced in the late 19th century, it revolutionized transportation by converting linear motion into rotational power.
The mechanism operates through a dynamic process. When fuel ignites within the cylinder, the piston moves up and down in a linear fashion. Connected to a crankshaft, this linear motion is transformed into rotational energy, which powers the vehicle’s wheels.

Features:
- German Laser cutting technology for a smooth assembling experience
- High precision steady-state laser cutting is adopted, and the process error is controlled within 5um, which is equivalent to 1 / 20 hair diameter.
- The wood grain is fine and uniform, showing silk luster, layered, wear-resistant, corrosion-resistant and not easy to crack.
- No Glue Needed: Unique Mechanical 3D Puzzle, laser-cut plywood, no toxic, environment friendly, smooth wooden board. All pieces are pre-cut, no glue needed. The interlocking mechanisms are pretty ingenious.
- Detailed Instruction Book: Making this mechanical model toy requires not only attentiveness but also patience. Feel the pride of assembling this entire IQ toy set-up with your very own hands.
Includes:
- (1) ROKR 3D Wooden Model Kit