Product Description
Build it. Add water. Make it move. 💧⚙️
Discover engineering in action with this DIY Hydraulic Robotic Arm Kit.
Instead of using motors or batteries, the model demonstrates how hydraulic pressure can transfer force and create movement. Once assembled, water moves through the hydraulic system to operate the mechanical arm — turning a hands-on building project into a working engineering demonstration.
Perfect for teens, curious makers and anyone who enjoys understanding how machines actually work.
See hydraulics come to life
Hydraulic systems use pressurised liquid to transfer force from one part of a mechanism to another.
With this model, builders can see that principle working in front of them: applying force to one piston transfers pressure through the water and moves another part of the mechanical arm.
A practical way to explore:
Hydraulic pressure
Force transmission
Mechanical movement
Pistons and linkages
Engineering principles
Assembly and problem solving
Why makers will love it
💧 Real hydraulic movement using water
⚙️ Working mechanical arm after assembly
🪵 Wooden DIY construction
🔋 No motor or battery required for the hydraulic mechanism
🧠 Encourages engineering thinking and problem solving
👐 Hands-on building experience
📵 Immersive offline STEM project
🔬 Demonstrates a real scientific principle
🎁 Great gift for teens, makers and engineering fans
👨👩👧 Fun project to build together
Bigger than it looks in photos
At roughly 53 cm across when assembled, this isn't a desk trinket — it's a full-size demonstration model with real reach. It takes up proper table space, which is exactly what makes the movement worth watching.
Water is the power source
You'll need water to run it, and that's the whole point: there's no motor, no battery and no electronics anywhere in the mechanism. Press one piston and the pressure travels through the liquid to move the arm at the other end.
A tip worth knowing: add a single drop of food colouring to the water before you fill the system. The coloured liquid makes the pressure visible as it travels through the tubes, which turns the finished model into a far better demonstration — and looks better too.
From pieces to a working machine
Assemble the wooden structure, connect the hydraulic components and experience the moment when pressure in the system makes the arm move.
It's not just a model to look at — it demonstrates why real hydraulic machines work.
Product details
Material: wood
Brand: U-Angel-1988
Model: CFMX032
Recommended age: 14+
Approx. assembled size: 53 × 12 × 30 cm
Power principle: hydraulic transmission using liquid pressure
Battery: not required for the hydraulic mechanism
Package contents
Components for one DIY hydraulic mechanical arm kit
Exact accessories may vary according to the selected version. Please check the product images before ordering.
Please note
Assembly is required.
Keep all parts organised during construction.
Fill and operate the model on a surface where a small spill won't cause damage — this is a wooden model and water is part of how it works.
Empty the system before storing the model for long periods.
Safety information
⚠️ WARNING: Not suitable for children under 14 years. Contains small parts — choking hazard for young children. Adult guidance is recommended during assembly.
Keep water away from electrical sockets, devices and cables while operating the model.
STEM challenge: Can you turn the pressure from your hand into movement at the other end of the machine?