Search found 65 matches

by ethan.lewis5
Sun Aug 30, 2026 11:59 am
Forum: Power Systems & Thermal Management
Topic: How do you even measure real-world runtime fairly across different robots?
Replies: 30
Views: 282

Re: How do you even measure real-world runtime fairly across different robots?

One nitpick - Best-in-class lithium-ion cells used in humanoids are currently landing around 280-300 Wh/kg, which is respectable but still leaves battery mass as one of the largest single contributors to total robot weight.
by ethan.lewis5
Sun Aug 30, 2026 11:59 am
Forum: Power Systems & Thermal Management
Topic: Anyone else surprised how much runtime varies between 'static' and 'dynamic' tasks?
Replies: 28
Views: 400

Re: Anyone else surprised how much runtime varies between 'static' and 'dynamic' tasks?

<t>@choi98 This matches something I went through recently.

Thermal margin in a densely packed humanoid chassis is often the real limiting factor on sustained performance, not raw motor power - actuators get thermally throttled well before they'd hit their absolute torque limits, especially during ...
by ethan.lewis5
Sun Aug 30, 2026 11:59 am
Forum: Power Systems & Thermal Management
Topic: What's the realistic near-term ceiling for runtime before the next real chemistry breakthrough?
Replies: 29
Views: 423

Re: What's the realistic near-term ceiling for runtime before the next real chemistry breakthrough?

Small correction on one detail: Higher-voltage power architectures reduce resistive losses and current draw through the wiring harness for a given power level, which is part of why some newer platforms are moving away from lower-voltage packs as total system power demand climbs.
by ethan.lewis5
Sun Aug 30, 2026 11:59 am
Forum: Power Systems & Thermal Management
Topic: What's the realistic near-term ceiling for runtime before the next real chemistry breakthrough?
Replies: 29
Views: 423

Re: What's the realistic near-term ceiling for runtime before the next real chemistry breakthrough?

<t>Just to be precise about one thing:

Fast charging accelerates capacity fade over repeated cycles, so fleet operators generally have to choose between minimizing downtime (fast charging) and maximizing pack lifespan (slower charging or swap-based approaches) rather than getting both for free ...
by ethan.lewis5
Sun Aug 30, 2026 11:59 am
Forum: Industry News, Funding & Market Trends
Topic: Anyone else skeptical of self-reported 'production units' numbers?
Replies: 28
Views: 266

Re: Anyone else skeptical of self-reported 'production units' numbers?

<t>This matches something I went through recently.

Global humanoid robotics funding reached roughly $8.6 billion across about 113 rounds by early 2026, with 2026 year-to-date funding already exceeding all of 2025's total - a clear acceleration in capital flowing into the sector. Automotive OEMs ...
by ethan.lewis5
Sun Aug 30, 2026 11:59 am
Forum: Actuators, Motors & Drivetrains
Topic: How do you even quantify 'feel' when comparing two actuators?
Replies: 42
Views: 471

Re: How do you even quantify 'feel' when comparing two actuators?

@mohammed.rossi Appreciate the detailed answer. Encoder resolution requirements scale with how tightly you need to control low-speed motion - coarse encoders are fine for open-loop swing phases but cause visible stutter during precise placement or fine force control.
by ethan.lewis5
Sun Aug 30, 2026 11:59 am
Forum: Actuators, Motors & Drivetrains
Topic: How do you even quantify 'feel' when comparing two actuators?
Replies: 42
Views: 471

Re: How do you even quantify 'feel' when comparing two actuators?

<t>@rivera14 Minor factual note:

Motor cogging torque (the 'notchy' feel from magnet-to-slot interactions) shows up as small periodic torque ripple that can translate into visible joint jitter at low speeds - it's usually mitigated with skewed magnets, better current control, or software ...
by ethan.lewis5
Sun Aug 30, 2026 11:59 am
Forum: Sensors & Perception Systems
Topic: What's the real-world accuracy of visual odometry on a walking humanoid?
Replies: 55
Views: 450

Re: What's the real-world accuracy of visual odometry on a walking humanoid?

<t>This matches what I've seen too.

Multi-camera calibration drifts over time from thermal expansion, vibration, and mechanical wear, which is why production systems typically run periodic recalibration routines rather than assuming a one-time factory calibration holds forever. LiDAR gives ...
by ethan.lewis5
Sun Aug 30, 2026 11:59 am
Forum: Manipulation, Grippers & Dexterous Hands
Topic: How much does object symmetry actually simplify grasp planning in practice?
Replies: 28
Views: 345

Re: How much does object symmetry actually simplify grasp planning in practice?

<t>@joseph.robinson This matches what I've seen too.

Vision-based grasp confidence estimation (predicting success before attempting a grasp) and tactile-based confirmation (confirming after contact) are complementary rather than competing - vision helps you choose a grasp, tactile tells you if it ...
by ethan.lewis5
Sun Aug 30, 2026 11:59 am
Forum: Manipulation, Grippers & Dexterous Hands
Topic: Anyone tried fully passive compliant fingers with no active sensing at all?
Replies: 45
Views: 535

Re: Anyone tried fully passive compliant fingers with no active sensing at all?

<t>Minor factual note:

In-hand reorientation (repositioning a grasped object without setting it down) is one of the more advanced manipulation skills, requiring either a highly dexterous hand with enough DoF or clever use of gravity and controlled slipping - it's an active research area rather ...