3D Printed hobbyist hand kit with endless possibilities! Learn about microcontrollers, programming and hardware.
BRG has created a 3D printed robotic hand that better mimics natural hand movement that anyone can easily learn to control.
We are presenting the Hobby Hand as an open source test bench that will preview technologies borrowed from the Nu-Hand (our previous Kickstarter attempt). The Hobby Hand is an affordable kit that will aid in the further development of our 3D prosthetic hands.
This platform is ideal for hobbyists, tinkerers, DIYers, and those who are interested in learning about robotics. The ‘Hobby Hand’ can also be used as an introductory educational platform for programming, micro-controllers, analog sensors, and hardware.
Hobby Hand Design Summary
The Hobby Hand contains 5 servo motors for lateral movement and a servo motor frame that houses 5 additional servo motors for flexion. A top piece mounts the hand onto the servo motor frame that guides the flexion cables to the servos.
A servo motor base contains the Arduino mega + servo shield that attaches under the servo motor frame. This is the 'control' center of the Hobby Hand where all of the motors, sensors and additional peripherals are attached to the board.
Each finger has a total of 4 bands that saddle the center line (symmetry in plane) to maximize the stability of each finger. The elastic bands bring the finger back to its original position after closing. A rear covering is attached to the back of the Hobby Hand frame.
How is the Hobby Hand 'controlled'?
The hobby hand utilizes an Arduino mega board, which is an open source micro-controller. The mega board is mated with a sensor shield that has an incredible amount of expandability and flexibility. Consumers can use custom code or code provided by BRG to perform various movements.
Is that a mixer board?
We have developed an analog board of potentiometers that can control flexion and lateral movement of each finger.
We plan on refreshing the design of the analog controller board to include a 3D printed case and proper knobs as our campaign progresses.
Is it hard to put together?
The unassembled kit requires soldering and the use of basic hand tools (screwdrivers, pliers and scissors). All kits will include a step by step instruction manual along with tutorials and other resources on our webpage to help you become proficient in no time!
If that is undesirable, we also offer the Hobby Hand assembled and ready to go right out of the box.
What else can the Hobby Hand do?
The hobby hand comes with a mini breadboard that is attached to the servo motor frame. This allows for the addition of extra analog sensors (light, sound, muscle and others), LED's and speakers. Examples will be provided on updates!
What happens if a component fails on the Hobby Hand?
The great thing about the Hobby Hand is that it is completely modular. Any component can be quickly replaced or even repaired. A catalog of parts and part numbers will be included in the instructions manual for orders.
The nitty gritty of the Hobby Hand
Materials: The hobby hand is 3D Printed using PLA (Polylactic Acid), which is a thermoplastic that is environmental friendly (biodegrades in nature without harmful by-products).
Power: The Arduino mega requires an external power adapter to drive the servo motors. A 5V 4 Amp charger is included with the complete Hobby Hand kit.
Hobby Hand Scale: Is it life sized? Yes! The hand was modeled after Tim's own hand and is life sized with roughly the same proportions.
Hobby Hand Movement: 5 servo motors generate lateral motion (side-to-side finger wagging), and 5 servo motors to close each finger. Each motor can move independently.
Hobby Hand Grip Strength: The hobby hand runs off a tension cable that is fixed to a pulley wheel. The stall torque of each servo motor ranges from 1.8 - 2 kg*cm (1.56 - 1.74 lbs*in).
Hobby Hand Lateral Strength: The hobby hand lateral movements will be generated using rigid metal rods (similar to RC airplane ailerons). The stall torque of each servo motor ranges from 1.5 - 1.8 kg*cm (1.301 - .56 lbs*in).
Hobby Hand Weight: The complete assembly weighs roughly 3 lbs (10 servos, Arduino board, Hobby Hand, base and analog controller).
Hobby Hand Project Timeline
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Risks and challenges
The Hobby Hand design is complete. The attachments of the lateral servos will come as an update during the campaign.
A digital instruction manual will be completed before the end of the campaign and will be available on our website. Additional code snippets and tutorials will also be available as well.
We do not foresee any major risks or challenges. However, we are at the mercy of distributors in receiving all of the parts that are included with the hobby hand kits.Learn about accountability on Kickstarter
- (45 days)