ROBOT ARMS / DESKTOP ARM

ReachReach for a clearer first prototype.

Reach is an anchored desktop arm with two servo locations, two links and a gripper layout. Use its moving kinematic preview to understand the assembly hierarchy and plan control and power before a physical build.

Build with Reach Explore the design

Includes assembly, starter wiring and executable virtual JavaScript.

ASSEMBLY PREVIEW/ARM

Reach · Desktop arm concept illustration; the 3D preview uses the actual preset geometry

Static illustration · loading 3D

Orbit the actual starter assembly. Open the workbench to edit or run it.

10components

10starter connections

1.22 kgestimated component mass

ESP32 DevKitcontrol platform

Reach · Desktop arm, an illustrated robot arms assembly

Concept illustration · inspect actual geometry above.

A COMPLETE STARTING POINT

Get to know
what's inside.

Two servo locations, two links, a gripper and an anchored base. All 10 components and 10 starter connections remain editable in your own project.

Arm assembly planningServo control learningReference-pose load screening

View the included component types

Anchored arm base
Arm pedestal
Position servo
Robot arm link · 150 mm
Two-finger gripper
2S battery · 2.2 Ah
5 V buck regulator
ESP32 DevKit · virtual controller

YOUR FIRST THREE EXPERIMENTS

Build understanding.
One change at a time.

Use the starting assembly to ask better questions about your design. Save a copy, change a parameter and compare what happens.

Inspect the design

Run the shoulder and elbow sweep and inspect how child links follow their joints.

Try a change

Edit named servo targets in the included JavaScript example.

Compare and learn

Compare link mass and reference-pose gravity moment estimates when changing parts.

arm-desktop.jsVIRTUAL API

function step(robot) {
  robot.drive(0, 0);
  if (robot.brownout || robot.battery.voltage < 6.25) { robot.display('🪫'); return; }
  robot.servo('shoulder', 0.28 + 0.16 * Math.sin(robot.time * 0.8));
  robot.servo('elbow', -0.22 + 0.14 * Math.sin(robot.time + 0.8));
  robot.display('🤖');
}

The full, editable starter script is included in the workbench.

KNOW WHAT YOU'RE TESTING

Kinematic motion preview

Working two-joint kinematic sweep with moving links. Static load estimates remain at the reference pose; no solved joint torque, moving-link collisions, IK or grasping.