Show HN: I'm a 15 Year Old Wannabe Engineer, This Is a Cycloidal Gearbox I Built
A 15-year-old’s 3D-printed cycloidal gearbox project impresses many for its practical engineering, documentation, and iteration from earlier versions, prompting encouragement to drop the “wannabe” label. Commenters explain that cycloidal gearboxes are compact, low-backlash, high-torque alternatives to traditional gears and suggest ways to quantify performance, such as measuring backlash and efficiency under load. The thread also surfaces broader themes: how AI and “vibe coding” change the learning experience for young builders, whether it’s wise for minors to share their age online, and what it means to call oneself an “engineer” across different countries and credentialing systems.
Reactions to the Project
- Many commenters are strongly impressed, emphasizing that the work is impressive “for any age,” especially given it’s a physical, manufactured mechanism and not just software.
- Several argue the author should drop the “wannabe” label and already count as an engineer in the informal sense, highlighting persistence, iteration (V2→V3), documentation, and publishing.
- Some see it as a great foundation for a future career or even for bypassing traditional degree paths if it leads to paid work.
Cycloidal Gearbox Explanation & Technical Feedback
- Multiple replies explain that a cycloidal gearbox is a speed-reduction gearbox trading speed for torque, valued for:
- Very low backlash
- Multiple simultaneous contact points
- High efficiency and compactness
- It’s noted they are common in robotics and in mechanisms like spare-tire hoists under trucks.
- Suggestions:
- Measure and document backlash and how it changes over cycles.
- Measure efficiency under load if possible.
- Add a simple explanation of what it is and why it’s special to the README.
- Some ask about SVG/CNC export; current Fusion script doesn’t support that.
Age, Safety, and Community Norms
- One camp warns against posting a minor’s age online, citing grooming and manipulation risks and arguing it adds no benefit.
- Another camp responds that technical communities have a tradition of welcoming and supporting young learners, and that age context can improve the relevance of feedback.
“Wannabe” vs Engineer and Title Protection
- Some say “if you build things, you’re an engineer,” especially in software and hobby contexts.
- Others stress that in many jurisdictions (e.g., parts of Europe, Canada, some US states) “engineer” is a regulated or culturally protected title, particularly in safety-critical fields.
- There’s acknowledgment that usage differs by country; “Professional Engineer” is distinguished from informal usage.
AI, Vibecoding, and Learning
- Several comments pivot to AI:
- Some feel AI has raised the bar and made earlier teen projects look less impressive, or made personal projects feel pointless if they can be “vibe coded” quickly.
- Others push back, saying AI doesn’t trivialize all engineering; it’s a power tool, not a replacement.
- Suggestions:
- Still do projects without AI to learn fundamentals.
- Use AI to aim for more ambitious or more physical (HW+SW) projects.
- You can always choose not to use “cheat codes” (AI) if you value the learning process.
Hack Club and Youth Opportunities
- Hack Club is recommended as a place for teens building projects, with pointers to joining their Slack and programs.
- One commenter praises it but notes that the culture can feel pressuring to “live fast” (internships, cohabitation) and urges teens to also feel okay going slower.
- Hack Club organizers respond that they want to support self-actualization, not pressure, and invite feedback.
Broader Reflections on Engineering & Motivation
- Commenters encourage focusing on deep personal interest, craftsmanship, and the satisfaction of physical builds.
- Some emphasize that long-term engagement and finishing projects are key signals that someone will make a good engineer.
- Practical tips include: secondhand mechanical engineering textbooks are cheap and very useful for a young builder.