Do you build robot structures or arms on request?
If you make robot frames, limbs, or robotic arms to order, we want a quote. The robot is Gibbon Bot, a small machine that hangs in a tree. It does not work yet. This page is the brief. It is not an order.
Email gibbon@olivabot.com with three prices: the CAD and a URDF, one unit, and ten units. The sizes and the motors are further down. Laboratory code: github.com/tonycurra/gibbon-bot.
Targets
- Under 10 kg
- Battery included, ready to hang. One grip holds the robot. Lighter is better.
- 2–3 hours
- Lithium-ion or sodium-ion. We can improve the runtime after the first unit.
- Brushless motors
- Driver and controller included. We command each joint from our own software.
- Open hardware
- A written protocol, units, and limits. Not a closed app.
- Four same limbs
- Six joints, then one prehensile hand. Hands and feet are the same part.
- Head, 2 joints
- Left and right, up and down. Cameras go here. The lab robot has no head.
How to answer
- Email gibbon@olivabot.com with three prices and a lead time: CAD and a URDF, one assembled unit, and ten units.
- If the price fits, send STEP files and a URDF of the hardware you would build. Names, axes, limits, effort, mass, and inertia must match that hardware.
- We train that URDF in our simulator.
- If the behavior looks right and one unit is a price we can pay, we order that unit and test it on a tree.
- Ten units are a later test. Quote them now. We are not ordering ten.
Size
Two arms and two legs, the same length, on a short torso. It hangs. It is not a biped. The lengths below are joint offsets from the laboratory model (a RoArm-M3 chain), not a manufacturing drawing. Move a few centimetres to save weight or to fit a battery, and say what you changed.
| Shoulder, base to pitch | 52 mm |
|---|---|
| Upper arm | 237 mm |
| Forearm | 145 mm |
| Wrist to the hand joint | about 110 mm |
| Limb, shoulder base to hand joint | about 544 mm |
| Torso, hips to shoulders | about 290 mm |
| Arm mounts, left to right | 342 mm |
| Leg mounts, left to right | 200 mm |
| Arms ahead of the legs | about 320 mm |
| Torso shell thickness | about 98 mm |
Motors and control
Brushless motors, with the driver and the controller in the quote. We need a way to move each joint from our own software: a written protocol on USB, CAN, or another bus you name. Open hardware means that protocol, the units, and the limits. A closed vendor app is not enough.
Size continuous torque and peak torque for a robot under 10 kg hanging from one grip, and write the mass you assumed. Waterproof, or say how rain stays out of the joint.
The arm in the lab lists 2.94 N·m on most joints, 5.88 N·m where two motors lift the shoulder, and 1.96 N·m on the gripper. Those figures describe that arm. They were too weak to climb. Do not copy them.
Materials and battery
- Structure in aluminum alloy, stainless steel, or metal sheet where a little give helps the grip.
- Where a part touches bark, metal or a bioplastic, so the tree picks up less pollution. Say which surfaces are which.
- Battery in the torso, lithium-ion or sodium-ion, aimed at 2–3 hours. State voltage, watt-hours, and where it sits. The mk.2 bench pack was a 3S Li-Po. Do not quote that.
What to email
- Price and lead time for STEP files and a matching URDF.
- Price and lead time for one assembled unit.
- Price and lead time for ten units.
- Mass, limbs and torso separate if you can, and whether it is under 10 kg.
- Motor type, controller, protocol, and the torque you sized for a hang from one grip.
- Battery chemistry, voltage, watt-hours, and the runtime you expect.
- Materials, especially anything that touches the tree.
Copyright
© 2026 Olivabot B.V. This page and the laboratory sizes are ours. Use them to write a quote. Do not republish the brief as your own product. Files you send stay yours until we pay for a unit.