Pin Based Hinge

𝐖𝐡𝐚𝐭’𝐬 𝐜𝐨𝐨𝐤𝐢𝐧𝐠 𝐭𝐡𝐢𝐬 𝐭𝐢𝐦𝐞?⁣

Let’s start with some gibberish:⁣

⁣🔹 DIN 7343 - Spiral Roll Pin⁣

🔹 DIN 1481 - Roll Pin ("C" Pin)⁣

Never heard of these before? Perfect—time to learn!⁣

One of their use cases is creating a simple hinge. 

But here’s the catch—if you check the specs, you’ll see these pins are designed to fit into holes with an 𝐇𝟕 𝐭𝐨𝐥𝐞𝐫𝐚𝐧𝐜𝐞⁣.⁣

Now, a quick reminder: hinges are supposed to... move! 😄⁣

So which holes should actually be reamed to H7? Why not the outer ones? Why do I suggest reaming only the 𝐬𝐢𝐧𝐠𝐥𝐞 𝐡𝐨𝐥𝐞 𝐢𝐧 𝐭𝐡𝐞 𝐦𝐢𝐝𝐝𝐥𝐞?⁣

It all comes down to 𝐃𝐞𝐬𝐢𝐠𝐧 𝐟𝐨𝐫 𝐀𝐬𝐬𝐞𝐦𝐛𝐥𝐲 (𝐃𝐅𝐀).⁣

If you ream the holes in the “fork” part, you’ll have to drive the pin through 𝐭𝐰𝐨 𝐭𝐢𝐠𝐡𝐭-𝐟𝐢𝐭 𝐡𝐨𝐥𝐞𝐬 along its length—twice! Not fun, and not efficient. Worse, you risk damaging the pin, making it too loose in the second hole.⁣

As an engineer, I 𝐝𝐨𝐧’𝐭 𝐥𝐢𝐤𝐞 𝐭𝐨 𝐠𝐚𝐦𝐛𝐥𝐞.⁣

And let’s be honest—I’m also a bit lazy 😉 (not at work, just when it comes to unnecessary extra tasks!)

By 𝐜𝐡𝐨𝐨𝐬𝐢𝐧𝐠 𝐭𝐡𝐞 𝐫𝐢𝐠𝐡𝐭 𝐡𝐨𝐥𝐞 𝐟𝐨𝐫 𝐭𝐡𝐞 𝐇𝟕 𝐟𝐢𝐭, you make assembly smoother and avoid headaches down the line.⁣

A small 𝐝𝐞𝐬𝐢𝐠𝐧 𝐭𝐢𝐩, but a big difference in execution. Hope this insight sticks with you—just like the pin should!⁣