# @stem_antics on Instagram

- **Type:** Image
- **Original URL:** https://www.instagram.com/p/DTZaeizkai5
- **Gondola URL:** https://gondola.cc/posts/76865631-stem-antics-instagram
- **Thumbnail:** https://img.gondola.cc/tr:w-,h-,fo-auto/postThumbnails/479133514d.jpg
- **Posted:** 2026-01-12T04:24:05.000+00:00
- **Account Owner:** Stem Antics (@stem_antics) — https://gondola.cc/stem_antics

## Caption

This visual compares several constant-velocity (CV) and non-CV joints, each optimized for a different engineering tradeoff:

• Universal Joint (Hooke’s Joint)
Simple and robust, but not constant velocity. As the joint angle increases, output speed oscillates twice per revolution — acceptable for low-speed or paired configurations.

• Double Cardan Joint
Two U-joints phased together to cancel velocity fluctuation. Common in drivetrains where angular misalignment is unavoidable but smoother rotation is required.

• Tripod Joint
Uses three trunnions riding in longitudinal tracks. Allows axial plunge (length change), making it ideal for suspension travel in front-wheel-drive systems.

• Rzeppa Joint
A true constant-velocity joint using balls constrained in a spherical cage. Maintains equal input/output speed even at high angles — critical for steering + power delivery.

• Thompson Coupling
Employs recirculating ball tracks to transmit torque with minimal backlash and high torsional stiffness. Often used in precision motion systems.

• Weiss Joint
An early CV design using internal rolling elements. Historically important, but largely replaced by more efficient Rzeppa-style joints.

Different joints exist because no single design optimizes for all constraints: angle, torque, speed, packaging, efficiency, durability, and cost.

Engineering is the art of choosing which compromises matter most.

💬 Which joint surprised you — or which one should we break down next?
🔁 Remix / share if you love mechanical systems.

#MechanicalEngineering #STEMEducation #Kinematics #MachineDesign #EngineeringExplained

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## Credits

No public credits are recorded here. This does not identify who made the post.

## Tags

kinematics, stemeducation, machinedesign, engineeringexplained, mechanicalengineering

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