How to Sharpen a Plane Iron

Sharpening plane irons to razor sharpness is essential. A dull iron tears wood rather than cutting it, causing tearout and frustration.

Sharpening Methods

Waterstones

Traditional Japanese water-lubricated stones. Fast cutting, requires flattening. Popular progression: 1000, 4000, 8000 grit.

Diamond Plates

Stay flat forever, work with water or dry. More expensive initially but low maintenance. Coarse, fine, extra-fine sequence.

Scary Sharp (Sandpaper)

Wet-dry sandpaper on glass. Cheap, effective, requires fresh paper frequently. 220, 400, 600, 1000, 2000 grit progression.

The Process

  1. Grind primary bevel (25°)
  2. Hone micro-bevel (30°)
  3. Flatten the back
  4. Strop for final polish (optional)
The back of the iron must be dead flat. Spend time on this once, then just maintain it.