Category Archives: spring

Mechanisms: the Spring

Posted on April 13, 2018 by Fernando Gomes

Most people probably don’t think about springs until one kinks up or snaps, but most of the world’s springs are pretty crucial. The ones that aren’t go by the name Slinky.

We all use and encounter dozens of different types of springs every day without realizing it. Look inside the world of springs and you’ll find hundreds of variations on the theme of bounce. The principle of the spring is simple enough that it can be extended to almost any shape and size that can be imagined and machined. Because it can take so many forms, the spring as a …read more

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Posted in Belleville washer, Buckling Spring, compression spring, deflection, extension spring, Hackaday Columns, Hooke's law, Interest, Mechanisms, Original Art, parts, Slinky, spring, torsion, torsion spring, volute | Leave a comment

To Ferrule or Not to Ferrule?

Posted on April 12, 2018 by Fernando Gomes

We recently posted about a spectacular 3D-printer fire that was thankfully caught and extinguished before spreading to the hacker’s house or injuring his family. Analyzing the remains of the printer, the hacker determined that the fire was caused when a loose grub screw let the extruder’s heater cartridge fall out and touch the ABS fan shroud. It ran full-on and set things on fire.

A number of us have similar 3D printers, so the comments for this article were understandably lively, but one comment stood out by listing a number of best practices for wiring, including the use of ferrules. …read more

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Posted in bootlace, connection, crimp, crimping, Engineering, ferrules, Hackaday Columns, insulation, interconnect, misc hacks, screw, sleeve, spring, stranded | Leave a comment

Junkyard Crossbow Aims to be a Car Killer

Posted on November 25, 2017 by Fernando Gomes

[James], aka [Turbo Conquering Mega Eagle], is not your typical Hackaday poster boy. Most of his builds have a  “Junkyard Wars” vibe, and he’d clearly be a good man to have around in a zombie apocalypse. Especially if the undead start driving tanks around, for which purpose his current anti-tank compound crossbow is apparently being developed.

At its present prototype phase, [James]’ weapon o’ doom looks more fearsome than it actually is. But that’s OK — we’re all about iterative development here. Using leaf springs from a Toyota Hi-Lux truck, this crossbow can store a lot of energy, which is …read more

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Posted in casting, composite, compound bow, crossbow, laminated, spring, trigger, weapons hacks | Leave a comment

Electronifying A Horror Fraught Hydraulic Press

Posted on April 18, 2017 by Fernando Gomes

[Josh] is replacing the springs in his car’s suspension. He wanted to know the travel rates of these springs, but apparently, this is a closely guarded trade secret in the industry. One company did manage to publish the spring rates, but they weren’t believable. Instead of taking this company’s word, [Josh] built a spring tester.

The theory behind a spring tester is pretty simple: apply a force to a spring, measure it, then measure how much the spring has traveled. Or compress a spring an inch or so, measure the force, and compress it some more. Either gets you the …read more

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Posted in car, load cell, spring, suspension, tool hacks, transportation hacks | Leave a comment

3D Printed Key-Code is Plastic Digital Logic

Posted on April 6, 2017 by Fernando Gomes

3D printers are great for creating static objects, but if you’re clever, it’s possible to print functional devices. If you’re absolutely brilliant you can go far beyond that, which is the case here. This door handle with a key-code lock does it all with 3D printing using mechanism designs that look like alien technology. This is just one application of a much more interesting mechanical digital logic they’re developing (PDF).

Working from the [Hasso-Plattner-Institut], the research team is focusing on metamaterials as mechanisms in and of themselves. The crux of this lock is a series of bistable springs that — …read more

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Posted in Bistable, code, Computer Hacks, door, key, lock, mechanism, Metamaterial, spring | Leave a comment