Hydraulic Arm Kit Assembly Video – Grade 9

2 min 25 s · Grade 9 Technology · hydraulic systems

The full build of the Slotbok hydraulic arm kit as a step-by-step 3D animation, from the flat laser-cut parts to a working excavator arm that moves on water in syringes. No batteries and no motors.

What goes into it

• 120 laser-cut 3 mm MDF parts, labelled in the order they are used.
• Six 5 ml syringes in three pairs, each pair joined by a tube: one syringe on the arm, its partner on the chassis.
• Three controls: boom up and down, stick in and out, bucket scoop and tip.

Push a control syringe and the water has nowhere to go but down the tube, so the syringe on the arm pushes out and moves the joint. That is the principle a Grade 9 report has to explain.

Get the hydraulic arm school project kit · Read the full Grade 9 build guide

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