Jonas Johnnson

In this episode, Swedish bladesmith and former podcaster Jonas Johnson AKA Isasmedjan. We talk about Jonas’s time working in a museum like, water powered shop with belt driven machines and the daily chore of clearing leaves, fish, and eels from the intake.

He explains why he left that space, how his current farm shop is set up, and the spring hammer vs. air hammer debate (he runs 40‑kg versions of both). He also shares his approach to getting the perfect hamon, why he prefers satanite, and how to manage warping with different steels. There’s plenty here for anyone obsessed with edges, metallurgy, and practical shop setup.

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