Sovereignty Module: Shave the Board

Complete Plane Iron and Woodworking Blade Making: From Bar to Shaving

Plane irons, spokeshave blades, and drawknife blades are precision cutting tools. This campaign covers blade geometry, forging, heat treatment, and fitting.

Chapter 1: Woodworking Blade Types

Chapter 2: Plane Iron Forging

Plane iron forging: 1) Start with high-carbon steel bar (1084 or O1). 2) Dimensions: 2 inches wide, 3/16 inch thick, 7-8 inches long. 3) Forge to uniform thickness. 4) Forge slot or hole for chip breaker screw (if needed). 5) Grind bevel: 25 degrees for general use, 30 degrees for hardwood. 6) Leave edge thick (1/32 inch) before heat treatment. 7) Harden: heat to non-magnetic, quench in oil. 8) Temper: 400-425°F (straw color) for 1 hour. 9) Target hardness: 60-62 HRC. 10) Flatten back on stone (must be dead flat). 11) Hone bevel to razor sharp on whetstones.

Chapter 3: Drawknife Forging

Drawknife: 1) Start with 1084 or 5160 steel bar. 2) Dimensions: 1 inch wide, 3/16 inch thick, 16-18 inches long. 3) Forge blade section: 8-12 inches, slightly curved. 4) Forge tangs: bend both ends 90 degrees (handles point toward user). 5) Tang length: 4-5 inches each. 6) Forge tang to round (3/8 inch diameter). 7) Grind bevel: 25-30 degrees on one side. 8) Harden blade section only (not tangs). 9) Temper blade: 425-450°F (straw to bronze). 10) Fit wooden handles on tangs.

Chapter 4: Heat Treatment for Woodworking Blades

Edge retention: 1) Woodworking blades need high hardness (60-62 HRC). 2) Higher hardness = longer edge retention. 3) But higher hardness = more brittle. 4) 60-62 HRC is the sweet spot for woodworking blades. 5) The blade must hold a keen edge through sustained use. 6) Proper heat treatment is the difference between a blade that stays sharp and one that dulls quickly.

Chapter 5: Sharpening

Sharpening process: 1) Flatten back first (critical: back must be dead flat). 2) Work through grits on back until mirror-polished near edge. 3) Set bevel angle (25-30 degrees). 4) Sharpen bevel through grits (coarse to fine). 5) Raise a burr on the back side. 6) Remove burr by stropping on leather or fine stone. 7) Test: blade should shave arm hair. 8) A properly sharpened plane iron produces transparent shavings.

Reference Card

1. The back must be flat (a plane iron with a curved or hollow back cannot produce a straight edge; flattening the back on a stone is the first and most important step in sharpening). 2. Bevel angle determines cutting character (25 degrees for softwood and general use; 30 degrees for hardwood and difficult grain; steeper angles are more durable but require more effort). 3. High hardness means long edge life (woodworking blades at 60-62 HRC hold their edge through sustained use; softer blades dull quickly and require constant resharpening). 4. Oil quench for plane irons (oil quenching produces less stress than water quenching; this is important for thin, wide blades that are prone to warping during hardening). 5. Temper to straw color (400-425°F produces the straw temper color that indicates the ideal balance of hardness and toughness for woodworking blades). 6. A sharp blade is a safe blade (a dull blade requires excessive force and is more likely to slip; a razor-sharp blade cuts with minimal effort and maximum control). 7. Transparent shavings prove sharpness (a properly sharpened plane iron produces shavings so thin they are transparent; this is the standard test for a well-sharpened blade). 8. Handmade plane irons outperform factory blades (a hand-forged plane iron from quality steel, properly heat-treated and sharpened, can outperform commercial blades at a fraction of the cost).