Caleb Foster
Metal nails are a common fastener used in construction and carpentry. They are typically made from coils of metal wire, most commonly steel, fed into a nail-making machine. The wire is gripped and cut to the desired length, with the end that will form the head of the nail being flattened by a mechanical hammer. The other end is then cut into a point, and the nail is ejected from the machine. Nails can be made from a variety of metals, including stainless steel, iron, copper, aluminium, and bronze, and are designed for specific applications, such as roofing, flooring, and masonry.
| Characteristics | Values |
|---|---|
| Tools | Hammer, anvil, hot cut, hardy, forge, tongs, punches |
| Metal temperature | 2800F, white hot, fluid or goopy |
| Safety | Aprons, goggles, gloves |
| Metal source | Salvaged wrought iron |
| Nail shape | Round or square stock |
| Nail size | 1/4" square stock |
| Cooling method | Natural cooling, no quenching |
| Performance | Harder to drive, less splitting, better holding |
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What You'll Learn
Heating the metal to a white-hot temperature
To make metal nails, you'll need a forge, an anvil, and a hammer. You'll also need to source your metal—salvaged wrought iron is a good option.
Before you begin, it's important to understand the process of heating metal and the colour changes it undergoes. Long before thermometers were widely available, blacksmiths had to rely on colour to determine the temperature of the metal they were working with.
When steel is heated to around 2800°F, it becomes white-hot. At this temperature, the top of the metal will be fluid and have a goopy feeling. The colour temperature of steel varies depending on the type of steel, but generally, the following can be observed:
- At around 525°C (977°F), steel begins to show a faint red glow.
- As the temperature increases to between 700°C and 870°C (1,300°F to 1,598°F), the glow progresses from dark red to cherry red.
- At around 981°C (1,798°F), the colour becomes light cherry red.
- As the temperature continues to rise, the colour changes to orange. Deep orange is observed at approximately 1,100°C (2,010°F), and clear orange appears up to 1,200°C (2,190°F).
- When the temperature reaches between 1,093°C and 1,258°C (1,999°F to 2,296°F), the steel glows yellow.
- At about 1,314°C (2,397°F), it shifts to yellow-white, and at temperatures above 1,315°C (2,397°F), it becomes white.
Now, to heat your metal to a white-hot temperature:
- Prepare your forge and ensure you are wearing the appropriate safety gear, such as an apron, goggles, and gloves, as there will be a lot of sparks.
- Place your metal in the forge and heat it until it reaches a white-hot temperature. This usually occurs at around 2800°F.
- Once the metal is white-hot, use your tongs to remove it from the forge and begin the process of shaping it into nails.
It's important to note that heating metal to a white-hot temperature requires extreme caution. Make sure you are working in a well-ventilated area and always prioritize your safety.
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Using a hot cut or hardy tool to shape the nail
To make a metal nail, you need to heat the metal to a white-hot temperature of about 2800°F. The top of the metal should be fluid and have a goopy feeling. You can use a forge to heat the metal. Once the metal is hot enough, you can use a hot cut or hardy tool to shape the nail.
A hot cut is a narrow chisel used to cut into hot metal. The hardy is similar, but it fits into the anvil, so you don't need to hold it. To make the nail, you need to heat the metal in the forge and then use the hot cut or hardy to cut it to the desired length. The metal should be hot enough that it can be cut with relatively little force.
The process of making a nail with a hot cut or hardy tool involves heating the metal to a malleable temperature and then using the tool to cut and shape it. The hot cut or hardy is placed in the hardy hole of the anvil, and the hot metal is placed on the anvil. The hot cut or hardy is then used to cut and shape the nail head and shank.
It is important to have good hammer control and practice to make good, repeatable hand-forged nails quickly. The nail maker must also learn to always orient the shank in the same way so that the first heading blow is always aimed in the same direction. This helps to center the head over the shank.
After shaping the nail with the hot cut or hardy, it is important to let it cool naturally without quenching it. Nails should be a little soft so that they don't break or shatter when hit with a hammer.
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Cooling the nail naturally
Once you've made your nail, it's important to let it cool down naturally. Don't be tempted to quench it, which is when you dip hot metal into a liquid to cool it. This will make the nail too hard, and it will shatter when you try to hammer it. Instead, let it cool slowly and naturally so that it remains a little soft.
The way you cool the metal will affect its properties. For example, round nails that have been quenched tend to punch through wood, causing it to split. A naturally cooled nail will be harder to drive into wood, but it will hold the wood together better.
Blacksmiths have been making nails by hand for centuries. It takes a lot of practice to make good, repeatable nails quickly. The process begins with a bar of salvaged wrought iron, which is heated in a forge and cut using a hot cut or a hardy. The blacksmith then hammers the bar flat and uses the edge of the anvil and precise hammer strikes to define the head of the nail.
A nail-making header can be made from wrought iron with an oval-shaped W1 dome forge welded on top. The wrought iron handle-stock is typically 6 to 8 inches of 1/2 to 3/4-inch round or square iron. A hole is drilled or punched from the back of the header as a pilot hole, and then a rectangular-tapered punch is used to create the required shape for the nail shank's cross-section.
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Using a forge and anvil to make nails
Nail forging is the process of creating nails by hand using a forge and anvil. It is an ancient skill that has been used for centuries to make nails of all shapes and sizes. Forged nails are stronger and more durable than machine-made nails and are considered more aesthetically pleasing.
To forge nails, you will need the following tools and materials: a cut-off tool, nail blanks (pieces of iron or steel), a forge, and an anvil. You can get an anvil from a blacksmith supply store. Heat the nail blank in the forge until it is bright yellow or white-hot. Using a hammer, draw out the shank of the nail by hammering it on the anvil. Create a set down or shoulder at the desired length of the nail and forge the shank so it fits the nail header tool. The header can be made from wrought iron with an oval-shaped dome forge welded on top. Drill or punch a small hole from the back of the header as a pilot hole, then punch it through from the back side to produce the required shape for the nail shank's cross-section. Ensure the hole is larger just below the tip of the header so that the nail doesn't stick.
To start a nail, heat the tip of a nail rod or drawn wire and hammer it out to a point. Using the edge of the anvil, create a shoulder on two sides of the nail. Clean up the taper of the nail on the anvil and draw it down so it slides smoothly into the header and rests on the shoulder. Notch the rod about 1/4" above the shoulder, break it off, and quickly hammer down the head of the nail with four clean strikes on the four corners. If done correctly, the nail should slip free of the header.
It takes practice to make good, repeatable hand-forged nails quickly. It takes an experienced blacksmith about a minute to make a nail, but most people should expect to spend 5-10 minutes on each nail. Forged nails should be allowed to cool naturally and should be a little soft so they don't break or shatter when hammered.
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The importance of hammer control
Hammer control is an essential aspect of nail making. It requires a high degree of precision and practice to forge good, repeatable hand-forged nails quickly. Here are a few reasons why hammer control is crucial in the process of creating metal nails:
Consistency and Quality
The ability to consistently strike the hot metal with the right amount of force in the desired location is vital. Each blow must be aimed accurately and delivered with the appropriate strength to achieve the desired shape and size for the nail shank's cross-section. Inconsistent hammer control can result in uneven nails that may be too thin or thick in certain areas, affecting their overall quality and performance.
Safety
Working with hot metal and powerful tools like hammers and anvils can be dangerous. Proper hammer control helps prevent accidental injuries. A controlled hammer blow ensures that the blacksmith can confidently handle the hot metal without the risk of it flying off in an unexpected direction. It also reduces the chances of the metal shattering or breaking due to an uncontrolled strike, which could lead to sharp metal fragments causing injuries.
Efficiency
By mastering hammer control, a blacksmith can increase their efficiency in nail making. With each precise hammer blow, the nail takes shape faster, reducing the time spent on each nail. While it may take a novice several minutes to create a single nail, an experienced blacksmith with excellent hammer control can significantly reduce that time.
Cost Savings
In the colonial era, blacksmiths sold their nails by weight, and bent nails were often sold at a lower price or straightened at home by cash-poor customers. By improving hammer control, a blacksmith can produce straighter nails, increasing their value and reducing the time spent sorting and straightening bent nails. This leads to cost savings and a more profitable enterprise.
In conclusion, hammer control is a critical skill in the art of nail making. It ensures safety, consistency, and efficiency in the process, ultimately contributing to the overall quality and profitability of the final product.
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Frequently asked questions
You will need a forge, a hammer, an anvil, a nail header, a hot cut, and a hardy.
First, draw the stock to a point and then never hit it again. Think in terms of the cross-section of the nail rod when determining the lengths of stock for the shank and head. Then, determine the length of stock for the shank and shoulder stock on two sides. Next, draw the stock between the shoulder and the point out parallel just enough to fit the header. Learn to do this without checking the fit in the header, as that wastes time and heat. Finally, determine the length of stock needed for the head.
You should let the nails cool naturally without quenching them. Nails should be a little soft so that they do not break or shatter when hit with a hammer.
