Sovereignty Module: Strike the Iron
Complete Blacksmithing, Forge Construction, and Metalworking Guide
The Philosophy of the Forge
The blacksmith is the backbone of any community. Without the smith, there are no tools, no hardware, no weapons, no agricultural implements, no hinges, no nails, no chains. Every other trade depends on the blacksmith's products. A single skilled smith can equip an entire village with everything it needs to function. This campaign covers forge construction, fire management, fundamental techniques, and the production of essential items.
Chapter 1: Building a Forge
The Coal/Charcoal Forge (simplest, most versatile):
| Component | Purpose | Construction |
|---|---|---|
| Fire pot (hearth) | Contains the fire | Steel plate with central depression (6-8 inch diameter, 3-4 inches deep) or firebrick box |
| Tuyere (air inlet) | Delivers air to fire | Steel pipe (1.5-2 inch diameter) entering fire pot from below or side |
| Bellows or blower | Provides forced air | Hand bellows, crank blower, or electric blower |
| Chimney/hood | Removes smoke | Sheet metal hood above forge, connected to chimney |
| Water trough (slack tub) | Quenching | Any container of water within arm's reach |
Building a Simple Forge from Scratch:
- Base: Stone, brick, or earth platform at waist height (32-36 inches)
- Fire pot: Dig or build a bowl-shaped depression in the center (firebrick or thick steel)
- Air supply: Run a pipe from below the fire pot to a bellows (can be as simple as a hand-pumped bellows made from two boards and leather)
- Clinker breaker: A rotating grate at the bottom of the fire pot to shake ash and clinker (slag) down and out
- Ash dump: Opening below the clinker breaker for removing accumulated ash
Bellows Construction (double-action):
Two chambers with one-way valves (leather flaps over holes). When one chamber compresses (exhales air), the other expands (inhales air). Result: continuous airflow regardless of stroke direction. Build from two boards (24x16 inches), leather sides, and leather flap valves.
Chapter 2: Fire Management
Fuel Types:
| Fuel | Temperature | Advantages | Disadvantages |
|---|---|---|---|
| Bituminous coal | 2,500-3,000F | Hottest, longest burning, cokes well | Requires mining, sulfur can damage steel |
| Charcoal (hardwood) | 2,000-2,500F | Clean (no sulfur), easy to make, traditional | Burns fast, requires large quantities |
| Anthracite coal | 2,200-2,800F | Very hot, clean burning | Hard to light, requires strong blast |
| Coke (processed coal) | 2,500-3,000F | Hottest, cleanest coal fuel | Requires coking process |
Fire Shapes:
| Shape | Use | How |
|---|---|---|
| Ball fire (concentrated) | Heating small areas, forge welding | Build deep fire, work in center |
| Long fire (trench) | Heating long pieces evenly | Rake coals into a line |
| Oxidizing fire (excess air) | Cleaning scale, general heating | Strong blast, thin fire |
| Reducing fire (limited air) | Forge welding (prevents oxidation) | Deep fire, gentle blast, green coal on top |
Heat Colors (critical for working temperature):
| Color | Temperature (F) | Workability | Operations |
|---|---|---|---|
| Black heat | Below 900 | Do NOT hammer (cracks) | No forging |
| Dark red (barely visible) | 900-1,050 | Light work only | Gentle bending of mild steel |
| Cherry red | 1,050-1,250 | Good working heat | Drawing, bending, punching |
| Bright cherry | 1,250-1,400 | Excellent working heat | All operations |
| Orange | 1,400-1,550 | Maximum workability | Heavy drawing, upsetting |
| Light orange/yellow | 1,550-1,700 | Forge welding heat (mild steel) | Welding only |
| White/sparkling | 1,700-2,000 | Burning (steel is being destroyed) | NEVER reach this |
Chapter 3: Fundamental Operations
Drawing Out (making metal longer and thinner):
Strike the workpiece on the far edge of the anvil face with overlapping blows, rotating 90 degrees between heats. Each blow pushes metal in the direction of the hammer strike. Work from the tip back toward the body of the piece.
Upsetting (making metal shorter and thicker):
Heat the area to be thickened. Strike the END of the workpiece (driving it into itself). The heated section compresses and bulges. Used to create heads on bolts, thicken areas for punching, and create mass where needed.
Bending:
Heat the bend point to cherry red or above. Place over the anvil edge (for sharp bends) or horn (for curves). Strike to create the bend. The metal on the outside of the bend stretches; the inside compresses.
Punching (making holes):
Heat the workpiece to bright cherry/orange. Place over the pritchel hole (small round hole in anvil). Drive a punch (tapered steel rod) through the hot metal. Punch from both sides to meet in the middle (prevents distortion).
Forge Welding (joining two pieces of steel):
The most critical and difficult operation. Two pieces of steel are heated to welding temperature (light orange/yellow, just below burning) and hammered together. At this temperature, the surface atoms bond permanently.
Requirements:
- Clean surfaces (wire brush immediately before welding)
- Flux (borax powder sprinkled on joint at orange heat, melts and flows, preventing oxidation)
- Reducing fire (deep, with limited air, to prevent scale formation)
- Speed (from fire to anvil in under 2 seconds)
- First blow: firm, centered, to establish contact. Subsequent blows: work outward from center to squeeze out flux and slag.
Chapter 4: Essential Anvil Work
The Anvil:
| Feature | Purpose |
|---|---|
| Face (flat top) | Primary working surface; must be flat and hard |
| Horn (pointed end) | Bending curves, scrolls, rings |
| Hardy hole (square hole) | Holds bottom tools (hardies, swages, fullers) |
| Pritchel hole (round hole) | Punching through, bending small stock |
| Edge (between face and sides) | Sharp bends, cutting (with care) |
| Step (between face and horn) | Cutting (place work here, strike with hot cut) |
Anvil Alternatives (if no commercial anvil available):
| Alternative | Weight | Effectiveness | Source |
|---|---|---|---|
| Railroad rail (stood on end) | 30-80 lbs | Good (hard face, narrow) | Salvage |
| Large sledgehammer head | 10-20 lbs | Moderate (small surface) | Hardware store |
| Thick steel plate (2+ inches) on stump | Variable | Good (wide face) | Scrap yard |
| Large boulder (flat top) | 100+ lbs | Poor (for copper/bronze only) | Nature |
| Forklift tine (cut section) | 50-100 lbs | Very good (hard, heavy) | Scrap yard |
Chapter 5: Making Essential Items
Nails (most consumed product):
- Heat 1/4 inch square rod to orange
- Taper to a point over 1.5 inches (four-sided taper)
- Cut almost through at 2 inches from point (leave thin connection)
- Insert in nail header (plate with tapered hole)
- Break off from rod
- Hammer protruding end to form head (2-3 blows)
- Drive out from below
- A skilled smith makes 200-400 nails per day
Knife (basic utility):
- Start with high-carbon steel (old file, spring steel, or 1075/1084 steel)
- Draw out to blade shape (taper both width and thickness toward edge)
- Establish tang (narrow section for handle)
- Normalize (heat to cherry red, cool in still air) three times
- Grind/file to final shape
- Heat treat: heat to non-magnetic temperature (cherry red, test with magnet), quench in oil
- Temper: clean surface, heat slowly until straw/bronze color appears (400-450F), quench
- Final grind and sharpen
Hinges:
- Forge two flat straps (1 inch wide, 1/8 inch thick, 4-6 inches long)
- Roll one end of each strap around a mandrel (3/8 inch rod) to form the barrel
- Interleave the barrels (one strap's barrel fits between the other's)
- Insert pin through all barrels
- Peen pin ends to retain
Chain:
- Cut pieces of 3/8 inch round stock, each 4 inches long
- Heat each piece and bend into an oval link around a mandrel
- Before closing the last link, thread it through the previous link
- Forge weld each link closed (or leave open for light-duty chain)
- A skilled smith makes 10-20 feet of chain per day
Chapter 6: Tool Making
Hammer (the smith's first tool):
- Start with a block of medium-carbon steel (2x2x4 inches)
- Punch or drift the eye (handle hole) using a tapered punch
- Draw out the face (one end) slightly crowned
- Draw out the peen (other end) to desired shape (cross peen, ball peen, or straight peen)
- Heat treat the face (harden and temper to blue/purple)
- Fit handle (hickory, ash, or similar tough wood)
Tongs (essential for holding hot work):
- Start with two pieces of 1/2 inch round or square stock, each 18 inches long
- Flatten one end of each for the jaw (shape to match the work: flat jaw, V-jaw, or bolt jaw)
- Create the boss (thickened area) at the pivot point by upsetting
- Punch or drill the rivet hole through each boss
- Assemble with a rivet
- Adjust jaw fit by heating and bending
Chisel (hot cut and cold cut):
- Start with 3/4 inch octagonal or round high-carbon steel, 8 inches long
- Draw out one end to a wedge shape
- For hot cut: thin edge (1/16 inch), used only on hot metal
- For cold cut: thicker edge (1/8 inch), used on cold metal
- Heat treat the cutting end (harden, temper to blue)
- Leave the struck end soft (will mushroom but not chip)
Chapter 7: Heat Treatment of Steel
The Three Steps:
| Step | Process | Purpose | Result |
|---|---|---|---|
| 1. Normalizing | Heat to cherry red, cool in still air | Relieves stress, refines grain | Uniform, stress-free structure |
| 2. Hardening | Heat to non-magnetic (cherry red), quench rapidly | Transforms crystal structure to martensite | Extremely hard but brittle (glass-like) |
| 3. Tempering | Reheat to specific temperature (by color), quench | Reduces brittleness while retaining hardness | Tough and hard (usable tool) |
Tempering Colors and Uses:
| Color | Temperature (F) | Hardness | Use |
|---|---|---|---|
| Pale straw | 380-400 | Maximum hardness | Razors, engraving tools |
| Straw | 420-440 | Very hard | Files, scrapers |
| Dark straw | 450-470 | Hard | Knives, chisels (fine work) |
| Bronze/brown | 480-500 | Hard-tough | Axes, punches, heavy chisels |
| Purple | 520-540 | Tough | Springs, swords |
| Blue | 560-580 | Very tough, moderate hardness | Springs, screwdrivers |
| Light blue/grey | 600-640 | Soft-tough | Structural, non-cutting tools |
Quenching Media:
| Medium | Cooling Speed | Best For | Notes |
|---|---|---|---|
| Water | Fastest | Low-carbon steel (1050 and below) | Risk of cracking in high-carbon |
| Oil (vegetable or mineral) | Moderate | Medium/high-carbon (1075-1095) | Most versatile, safest |
| Air | Slowest | Air-hardening steels, normalizing | Gentlest, least distortion |
| Brine (salt water) | Faster than water | When maximum hardness needed | Highest cracking risk |
Chapter 8: Identifying Unknown Steel
When working with salvaged steel (which is most steel in a rebuilding scenario), you must identify its carbon content to heat-treat it properly.
Spark Test:
Hold steel against a grinding wheel and observe the spark pattern:
| Spark Pattern | Carbon Content | Steel Type | Examples |
|---|---|---|---|
| Long, straight, few forks | Low (0.05-0.20%) | Mild steel | Rebar, structural steel, nails |
| Moderate forks, some bursts | Medium (0.30-0.50%) | Medium carbon | Axles, shafts, some tools |
| Many forks, star bursts | High (0.60-0.95%) | High carbon (tool steel) | Files, springs, saw blades |
| Explosive bursts, very bright | Very high (1.0%+) | Cast iron or ultra-high carbon | Brake rotors, old files |
File Test:
Run a sharp file across the steel:
- File bites easily: low carbon (soft)
- File skates/slides: high carbon (hard) or already hardened
Magnet Test (for heat treatment):
Steel becomes non-magnetic at its critical temperature (the point where crystal structure transforms). Heat slowly and test with a magnet. When it stops attracting the magnet, it is at hardening temperature. This works regardless of the specific alloy.
Chapter 9: Welding Without Electricity
Forge Welding (already covered in Chapter 3)
Brazing (joining with brass/bronze):
Heat the joint to red heat. Apply borax flux. Touch brass rod to the joint (it melts and flows into the gap by capillary action). Result: strong joint without reaching welding temperature. Works on dissimilar metals.
Riveting:
- Drill or punch matching holes in both pieces
- Insert rivet (soft iron or copper rod, slightly longer than total thickness)
- Support one end on anvil (or buck)
- Hammer the other end to form a head (mushroom shape)
- Result: permanent mechanical fastener
Soldering (low-temperature joining):
For tin, copper, and brass work. Clean surfaces with flux (rosin or zinc chloride). Heat joint with iron or torch. Apply solder (tin-lead or tin-silver alloy) which melts and flows into joint. Strong for sheet metal work but not structural.
Chapter 10: The Smith's Production List
What a village needs from its smith (annual estimates for 50 people):
| Category | Items | Quantity |
|---|---|---|
| Agriculture | Plowshares, hoes, sickles, scythes, rakes | 20-40 pieces |
| Construction | Nails, hinges, latches, hooks, brackets | 2,000+ nails, 50+ hardware pieces |
| Household | Knives, pot hooks, trivets, fire tools, candle holders | 30-50 pieces |
| Tools | Axes, hammers, chisels, files, drill bits | 20-30 pieces |
| Transport | Horseshoes, wheel tires, chain, hardware | 100+ horseshoes, misc. |
| Weapons/defense | Knives, spear points, arrowheads | As needed |
| Repair | Sharpening, welding, replacing worn parts | Continuous |
Reference Card
BLACKSMITHING ESSENTIALS:
- Never hammer cold steel (below dark red): it cracks
- Never heat steel to white/sparkling: it burns (irreversible damage)
- Forge welding requires: clean surfaces, flux, reducing fire, speed, firm first blow
- Heat treat sequence: normalize, harden (quench from non-magnetic), temper (reheat to color)
- The anvil is your most important tool: keep the face clean and undamaged
- Make your own tools first (tongs, hammers, punches), then make tools for others
- Charcoal works perfectly if coal is unavailable (just burns faster)
- A good smith works efficiently: plan your heats, minimize trips to the fire
This campaign provides the complete knowledge to build a forge from raw materials and produce every metal item a community needs. The blacksmith is the multiplier of all other trades: without forged tools, no other craft can function at its full potential. One skilled smith can equip an entire village.