Practical Mechanical Design
Bridge the gap between textbook mechanics and hardware that actually works. Learn how to prevent binding, design joints that resist fatigue, and tame thermal expansion in real mechanisms.
Like Duolingo, but for Practical Mechanical Design. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
A short one: 11 levels across 2 sections, about 22 minutes end to end, roughly 4 days at five minutes a day. It moves through Kinematic Integrity and Joints and Surviving Stress and the Real World. It assumes you already know the basics.
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Key ideas in Practical Mechanical Design
- A rigid 3D body possesses 6 degrees of freedom: 3 translations and 3 rotations.
- Each distinct, non-redundant point contact constrains exactly one degree of freedom.
- Five point contacts leave exactly one unconstrained direction of travel (pure sliding).
- Overconstraint forces redundant kinematic mounts to fight each other's geometric errors.
- Misaligned parallel guides generate high internal stress, premature wear, and sliding friction.
- One guide should define position while the companion guide floats to relieve redundant constraints.
- A Kelvin clamp isolates 6 degrees of freedom across three distinctly shaped contact nests.
- A Maxwell coupling uses 3 symmetrical V-grooves pointing toward the center to absorb thermal drift.
- Overconstrained plane joints buckle or slip when components undergo unequal thermal expansion.
- Compliant flexures move purely via elastic material deformation without sliding contact.
- Eliminating sliding contact prevents backlash, stick-slip friction, and grease contamination.
- Flexure travel is strictly limited by the material's yield strength and fatigue limits.
- Torque rotates threads up an incline to stretch the bolt shank elastically.
- The stretched bolt shank acts like a stiff spring providing sustained clamp force.
- Thread friction resists tightening and does not provide joint clamping power.
- Most external tension decompresses the stiff clamped flange instead of pulling the bolt.
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives Practical Mechanical Design the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
In three-dimensional space, how many total degrees of freedom does an unconstrained rigid object have?
Get it right to open this lesson and 10 more in the app.
How to learn Practical Mechanical Design, step by step
Go in order. 11 short levels across 2 sections, about 22 minutes in all, five minutes a day.
- 1
Kinematic Integrity and Joints
- Constraining Motion Without Binding
- Designing Reliable Bolted Joints
- 2
Surviving Stress and the Real World
- Mitigating Fatigue and Stress Raisers
- Managing Thermal Expansion and Stiffness
2 sections · 4 units · 11 levels. Built to play, not to enroll.
Questions about Practical Mechanical Design
How do I learn Practical Mechanical Design?
Go in order: start with Kinematic Integrity and Joints, then Surviving Stress and the Real World. On Tomo that's 11 short levels, about 22 minutes in all, played five minutes a day. Start free and play the first level in under a minute.
Is there a Duolingo-style app for Practical Mechanical Design?
Yes. Tomo works like Duolingo: short daily lessons, streaks and quick quizzes. Practical Mechanical Design is one of its free courses, and you can type any other topic to get a course of your own.
Is the Practical Mechanical Design course free?
Yes. Practical Mechanical Design is playable on Tomo's free plan, which doesn't expire. No credit card, no waitlist. Download the app and start your first lesson.
How long does it take to learn Practical Mechanical Design?
11 levels across 2 sections, about 22 minutes of play in total. It's built for five minutes a day, so you finish it a little at a time instead of all at once.
Do I need any background to start Practical Mechanical Design?
No. It's pitched at an intermediate level, so it starts where you are and builds up. If you can tap a phone, you can start.
Tomo is in ChatGPT
Tomo is also a ChatGPT plugin: the same playable courses, built and played inside your chat.
Add Tomo to ChatGPT- What to ask
- “Make me a Tomo course on black holes.” “Turn this chat into a Tomo course.”
- What you get
- Quick questions with instant feedback, hearts and stars, ready to play in about a minute.
- Where it goes
- No sign-up to start. Connect your Tomo account and your streak carries on in the app.
You pick the voice
Practical Mechanical Design is taught in the Bestie style: your friend who just gets it. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Start Practical Mechanical Design today.
Download Tomo, search Practical Mechanical Design, and play your first lesson in under a minute.