Understand Blade Wear and Spindle Damage

What happens here

The presenter explains the disadvantages of repeatedly sharpening lawnmower blades. He demonstrates that sharpening removes steel, which can lead to blade imbalance. An imbalanced blade causes wobbling, which in turn puts excessive stress on the mower's spindles and bearings, leading to premature wear and potential damage that manifests as 'weird noises.' He also notes that new blades often have hardened outer edges, providing better durability. For these reasons, he advocates for replacing blades with new ones periodically rather than sharpening them indefinitely.

Goal: Explain why replacing blades is often better than continuous sharpening.