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/

Created with GIMP
" data-medium-file="https://hackaday.com/wp-content/uploads/2025/04/buoy24_feat.jpg?w=400" data-large-file="https://hackaday.com/wp-content/uploads/2025/04/buoy24_feat.jpg?w=800">If you had to guess, what do you think it would take to build an ocean-going buoy that could not only survive on its own without human intervention for more …read more (https://hackaday.com/2025/04/17/supercon-2024-exploring-the-ocean-with-open-source-hardware/)

Designing an FM Drum Synth from Scratch
https://hackaday.com/2025/04/17/designing-an-fm-drum-synth-from-scratch/

How it started: a simple repair job on a Roland drum machine. How it ended: a scratch-built FM drum synth module that’s completely analog, and completely cool. [Moritz Klein]’s journey …read more (https://hackaday.com/2025/04/17/designing-an-fm-drum-synth-from-scratch/)

A Blacksmith Shows Us How To Choose An Anvil
https://hackaday.com/2025/04/17/a-blacksmith-shows-us-how-to-choose-an-anvil/

No doubt many readers have at times wished to try their hand at blacksmithing, but it’s fair to say that acquiring an anvil represents quite the hurdle. For anyone not …read more (https://hackaday.com/2025/04/17/a-blacksmith-shows-us-how-to-choose-an-anvil/)