Complete Flint Knapping and Stone Tool Making: From Cobble to Cutting Edge
Flint knapping is the oldest technology, producing razor-sharp tools from stone. This campaign covers stone selection, percussion techniques, pressure flaking, and tool types.
Chapter 1: Stone Selection
Stone
Fracture Quality
Edge Sharpness
Availability
Color
Difficulty
Obsidian
Excellent (conchoidal)
Razor sharp (molecular)
Volcanic regions
Black, dark
Moderate
Flint/chert
Excellent (conchoidal)
Very sharp
Widespread (limestone)
Gray, brown, tan
Moderate
Jasper
Very good
Very sharp
Moderate
Red, yellow, green
Moderate
Agate
Very good
Very sharp
Moderate
Banded, varied
Moderate-high
Quartzite
Good
Sharp
Very common
White, gray, pink
Low-moderate
Basalt
Fair
Moderate
Very common (volcanic)
Dark gray, black
Low
Glass (bottle)
Excellent
Razor sharp
Everywhere (modern)
Green, brown, clear
Low
Porcelain
Very good
Very sharp
Common (modern)
White
Low
Conchoidal fracture: 1) Ideal knapping stones fracture in smooth, curved surfaces (like a seashell). 2) When struck, force radiates outward in a cone shape. 3) This cone of force removes a flake with predictable geometry. 4) The flake has a bulb of percussion (where force entered). 5) Flake edges are razor sharp (sharper than surgical steel with obsidian). 6) Quality of fracture depends on stone homogeneity. 7) Inclusions, fossils, or cracks cause unpredictable breaks. 8) Test stone: strike with hammerstone; good stone produces thin, curved flakes.
Chapter 2: Percussion Techniques
Technique
Tool
Force
Control
Use
Difficulty
Hard hammer
Hammerstone (round cobble)
High
Low
Initial shaping, large flakes
Low
Soft hammer
Antler billet, copper billet
Moderate
Good
Thinning, shaping
Moderate
Bipolar
Hammerstone on anvil stone
Very high
Very low
Splitting cobbles, cores
Very low
Indirect percussion
Antler punch + hammerstone
Moderate
Very good
Precise flake removal
High
Hard hammer percussion: 1) Select hammerstone (round, dense cobble that fits in hand). 2) Hold core (stone being shaped) in non-dominant hand. 3) Strike edge of core at approximately 45-degree angle. 4) Strike at or just below the platform edge. 5) Follow through (do not pull back on impact). 6) Flake detaches from opposite side of strike. 7) Platform angle must be less than 90 degrees (acute angle). 8) If platform is too steep (greater than 90°), flake will not detach cleanly. 9) Prepare platforms by removing small chips to create proper angle. 10) Rotate core, removing flakes around entire circumference.
Chapter 3: Pressure Flaking
Pressure flaking: 1) Tool: antler tine, copper nail in wooden handle, or hardened nail. 2) Place tip of pressure flaker on edge of stone. 3) Push inward and downward simultaneously. 4) Small flake pops off the opposite face. 5) Work around entire edge for uniform sharpening. 6) This is the finishing technique (after percussion shaping). 7) Creates the final sharp, serrated, or notched edge. 8) Used for: arrowheads, fine knives, notching for hafting. 9) Requires practice (too much pressure = break; too little = nothing happens). 10) Support the piece on leather pad on thigh (protects leg from cuts).
Tool Type
Technique Sequence
Time
Difficulty
Result
Simple flake tool
Hard hammer only
1 minute
Very low
Crude but sharp cutting edge
Chopper
Hard hammer shaping
5-10 minutes
Low
Heavy cutting/chopping
Knife (bifacial)
Hard hammer + soft hammer
15-30 minutes
Moderate
Thin, sharp knife
Arrowhead
All techniques + pressure flaking
30-60 minutes
High
Small, precise projectile point
Spear point
All techniques
20-45 minutes
Moderate-high
Large projectile point
Scraper
Hard hammer + minimal shaping
5-10 minutes
Low
Hide scraping, woodworking
Drill
Pressure flaking on narrow flake
15-30 minutes
Moderate
Boring holes
Chapter 4: Tool Types and Uses
Tool
Shape
Edge
Primary Use
Secondary Use
Hand axe
Teardrop, bifacial
All around
Chopping, cutting
Digging, scraping
Knife
Thin, leaf-shaped
One or two edges
Cutting, slicing
Skinning
Scraper
Thick, steep edge
One edge (steep)
Hide scraping
Woodworking
Arrowhead
Small, triangular
All edges sharp
Projectile point
Cutting
Spear point
Large, leaf or stemmed
All edges
Projectile/thrust
Cutting
Burin
Chisel-like point
Narrow point
Engraving, grooving
Bone/antler working
Adze
Beveled one side
One edge
Woodworking (chopping)
Digging
Chapter 5: Safety and Practice
Hazard
Prevention
Treatment
Cuts from sharp flakes
Leather gloves, leg pad, eye protection
Clean wound, bandage (flake cuts are very clean)
Eye injury from flying chips
Safety glasses (always)
Seek medical attention
Silicosis (long-term dust)
Work outdoors, wet knapping
N/A (prevention only)
Hand strain
Take breaks, stretch
Rest, ice
Reference Card
Platform angle is everything (the angle where you strike must be less than 90 degrees; if the platform is too steep, the flake will not detach). 2. Obsidian is sharper than steel (obsidian fractures to a molecular edge, sharper than any metal blade; it was used for surgery). 3. Soft hammer for thinning (switch from hammerstone to antler billet when you need to remove thin, wide flakes for shaping). 4. Pressure flaking is the finishing step (after percussion shaping, pressure flaking creates the final sharp edge, notches, and serrations). 5. Every flake is a tool (the flakes you remove during shaping are themselves razor-sharp cutting tools; do not discard them). 6. Practice on glass bottles (bottle glass knaps identically to obsidian; it is free, abundant, and perfect for learning). 7. Wear eye protection always (stone chips fly unpredictably; a chip in the eye can cause permanent damage). 8. The stone tells you what it wants to be (read the fracture patterns; work with the stone's natural geometry, not against it).
