2025-07-24 Hacker News Top Articles and Its Summaries
1. CARA – High precision robot dog using rope Total comment counts : 42 Summary CARA (Capstans Are Really Awesome) is an advanced quadrupedal robot designed without gears or pulleys, using capstan drives for its joints. Building on past designs, CARA uniquely leverages capstan drives, which provide high torque, zero backlash, and quiet operation. Achieving an exact 8:1 gear ratio required precise calculations of effective drum diameters. The robot’s legs utilize a 5-bar linkage system for compactness and load distribution, powered by BLDC motors and controlled using ODrive controllers....