This short video from [ProShorts 101] shows us how to build a variable speed disc sander from not much more than an old hard drive. We feel that as far …read more (https://hackaday.com/2025/04/16/making-a-variable-speed-disc-sander-from-an-old-hard-drive/)

GK STM32 MCU-Based Handheld Game System
https://hackaday.com/2025/04/16/gk-stm32-mcu-based-handheld-game-system/

These days even a lowly microcontroller can easily trade blows with – or surpass – desktop systems of yesteryear, so it is little wonder that DIY handheld gaming systems based …read more (https://hackaday.com/2025/04/16/gk-stm32-mcu-based-handheld-game-system/)

An Absolute Zero of a Project
https://hackaday.com/2025/04/16/an-absolute-zero-of-a-project/

How would you go about determining absolute zero? Intuitively, it seems like you’d need some complicated physics setup with lasers and maybe some liquid helium. But as it turns out, …read more (https://hackaday.com/2025/04/16/an-absolute-zero-of-a-project/)

Using a MIG Welder, Acetylene Torch, and Air Hammer to Remove a Broken Bolt
https://hackaday.com/2025/04/16/using-a-mig-welder-acetylene-torch-and-air-hammer-to-remove-a-broken-bolt/

If your shop comes complete with a MIG welder, an acetylene torch, and an air hammer, then you have more options than most when it comes to removing broken bolts. …read more (https://hackaday.com/2025/04/16/using-a-mig-welder-acetylene-torch-and-air-hammer-to-remove-a-broken-bolt/)

Modernizing an Enigma Machine
https://hackaday.com/2025/04/17/modernizing-an-enigma-machine/

This project by [Miro] is awesome, not only did he build a replica Enigma machine using modern technologies, but after completing it, he went back and revised several components to …read more (https://hackaday.com/2025/04/17/modernizing-an-enigma-machine/)

Budget Schlieren Imaging Setup Uses 3D Printing to Reveal the Unseen
https://hackaday.com/2025/04/17/budget-schlieren-imaging-setup-uses-3d-printing-to-reveal-the-unseen/

We’re suckers here for projects that let you see the unseeable, and [Ayden Wardell Aerospace] provides that on a budget with their $30 Schlieren Imaging Setup. The unseeable in question …read more (https://hackaday.com/2025/04/17/budget-schlieren-imaging-setup-uses-3d-printing-to-reveal-the-unseen/)

Bicycle Gearbox Does it by Folding
https://hackaday.com/2025/04/17/bicycle-gearbox-does-it-by-folding/

If you’ve spent any time on two wheels, you’ve certainly experienced the woes of poor bicycle shifting. You hit the button or twist the knob expecting a smooth transition into …read more (https://hackaday.com/2025/04/17/bicycle-gearbox-does-it-by-folding/)

Supercon 2024: Exploring the Ocean with Open Source Hardware
https://hackaday.com/2025/04/17/supercon-2024-exploring-the-ocean-with-open-source-hardware/