In this Boing Boing Video, PopSci columnist and author of the splendid and high-recommend Theo Gray’s Mad Science, explains how electrochemical machining (ECM) works and shows off a rig he put together to do ECM in his shop.

The entire how-to can be found at

Carve Steel with Saltwater, Electricity and a Tin Earring (Popsci)

Theo Gray on why “safety” is overrated
Behold: the flaming bacon lance of death!