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First Servo Based Prototype

A project log for ARX Hand Project X1S

Servo variant of the ARX X1

supercellSupercell 01/23/2020 at 11:430 Comments

First experimental servo prototype derived from the ARK MK0 prototype. This prototype used 5 SG90 servos that I had purchased a few years back that I never got around to using. The servos aren't of great quality, so I would recommend using modern MG90S servos which are more durable with the metal gears and has a digital system. Overall initial impressions weren't that great with the use of the SG90 servos due to lack of torque and feedback, however, it does show a promising development for an educational/development tool. I will be developing some methods of improving feedback along with using some slightly more powerful servos in the next version.

Features:
- Servo based design
- Easy control with servos
- 5 actuation motors
- Low cost at around $30
- Added experimental geometry features to help with assembly

Specs:
- 5 SG90 servos
- Used a PCA9685 PWM driver board for easier control through an Arduino.

Further Work:
- Adjustments needed for screw locations for swap able fingers
- Subtle changes needed for cord location and overall adaptability for different servos
- Possible additions of new elastic cord system
- Better cable management for servo wires
- Use of higher torque servos
- Use of feedback for servo position and load

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