How to Make: RAZOR SHARP Lawn Mower Blade CLEAVERS!

About this video

ZNA Productions forges two large kitchen cleavers from salvaged materials, documenting the metalworking process from initial stock preparation through hardening, grinding, and final sharpening. The build showcases materials science concepts like metal tempering and edge geometry while highlighting the iterative nature of precision tool-making, including the host’s decision to pursue a rougher finish to meet practical time constraints without compromising functionality or aesthetics.

Key takeaways

• Metalworking projects require understanding material properties—tempering color, heat treatment timing, and blade geometry all affect final performance
• Precision work demands patience and proper tooling; grinding large surfaces requires magnets, multiple belts, and strategic breaks to maintain quality
• Sometimes ‘good enough’ decisions are smart engineering—trading perfect polish for reasonable timelines while preserving the tool’s core purpose and character
• Testing reveals real-world performance; sharp geometry combined with mass creates surprising cutting power that raw materials alone don’t predict

Episode details: published July 14, 2018 · 1.3M views · 29:04 long. Summary written by Self Growth Videos from the episode itself. ZNA’s builds are his designs and experiments, covered here as commentary on the engineering ideas — Self Growth Videos does not publish build instructions, and his weapon-style projects should not be replicated.

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