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Robotics

Projects
Inmoov
A 3D printable humanoid robot using low cost electronics, actuators and sensors.
Uses My Robot Lab software.
 
Spherebot
Spherebot is a variant of the Eggbot, which can draw on a spherical object like eggs, ping-pong balls, xmas baubles, etc.. The Spherbot uses an Arduino to control a servo and a couple of Stepper Motor Drivers.
 
Cyclone PCB Factory
The Cyclone a 3D Printable PCB milling machine developed in the same spirit as RapRap 3D printers. The hardware design is open and the community has contributed to its continuing development. Some useful resourses are the RepRap wiki and Thingiverse depot.
 

Components
Servos
HexTronik HTX90: (typ. £3.25 @ sparksid_rc)
A small (9g) servo motor with 1.6kg of force. Typical specs can be seen on the HobbyKing website.
Specs:
  • Size : 21x12x22 mm / 0.74x0.42x0.78 in
  • Voltage : 3v ~ 6v
  • Current : 750mA peak / 550mA avg.
  • Weight : 11g / 0.39oz
  • Speed : 0.12 sec/60(4.8V)
  • Torque : 2.5 kg-cm
  • Working Temp : -30C~60C
  • Gears : Nylon White type
 Stepper Motors
17HS19-1684S: (typ. £12.50 @ Think3DPrint3D)
Popular bipolar (2 windings) motor with molex connector and plenty of torque for 3D printing.
Specs:
  • NEMA 17 (42 x 42 mm)
  • Bipolar, 4-wire
  • 1.8 degree step angle
  • Holding torque 44 N.cm (4.4kg.cm, 62oz.in)
  • Voltage 2.8V
  • Current/Phase 1.68A
  • Weight 0.35kg
Stepper Motor Driver
Allegro A4988: (typ. £3.50 @ EllieShang)
DMOS Microstepping Driver with Translator and Overcurrent Protection, see datasheet.
Typically supplied on a carrier board with 0.1" headers.
Specs:
  • Voltage: 3.3V - 5V
  • Current: One bipolar motor at 2A per coil
  • PCB size: 20mm x 16 mm

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