Tag: Leathercraft Tools

When punching leather with a pricking iron, many leatherworkers focus only on the tooth spacing and shape of the iron. However, the depth and direction of the holes are also affected by the mallet face, weight, striking position, and condition of the workbench.

Even when using the same pricking iron, the tool may tilt if the mallet strikes away from the center of the head or if the striking face is badly worn. In a leather workshop, a mallet should not be treated simply as a tool for hitting hard. It should be selected for its ability to transfer the required force accurately to the pricking iron.

Inspect the Face of a Leathercraft Mallet First

A mallet used with pricking irons and punches must have a flat striking face. If one side is worn or the center has developed a deep indentation, the force will not be transferred evenly to the head of the tool. Even when the pricking iron is held upright, an uneven impact can push it to one side and cause the teeth to enter the leather at an angle.

Repeatedly striking a metal pricking iron with a metal hammer can deform the head or spread its edges. Unless the tool is specifically designed to be struck with metal, it is better to use a mallet face made of nylon, urethane, rawhide, or another material that absorbs some of the impact. Before beginning work, check the striking face for cracks and deep grooves.

A Heavier Mallet Is Not Always Better

If the mallet is too light, the same position may need to be struck repeatedly, increasing the possibility that the leather or pricking iron will move. A mallet that is too heavy can drive the iron deeper than necessary and place unnecessary strain on the wrist and arm.

The appropriate weight depends on the thickness and number of leather layers, the number of teeth on the pricking iron, and the firmness of the punching board. Before working on the actual piece, make test holes in a scrap of the same leather to determine how much force is required. To learn how to test cutting, bonding, and hand-stitching conditions in advance, see [Why Leathercraft Test Scraps Matter: Checking Cutting, Bonding, and Hand-Stitching Conditions]for more details.

Strike the Center of the Pricking Iron Head

When the mallet strikes the edge of the pricking iron head, the impact moves away from the tool’s central axis. If this happens repeatedly, the iron can tilt to one side, causing the holes on the front and back of the leather to become misaligned. Before striking, check that the mallet will come down on the center of the pricking iron head.

The No. 7 pricking iron used in the workshop has approximately 3.8 mm tooth spacing, while the No. 9 iron has approximately 3.0 mm spacing. Two-tooth and seven-tooth irons have different head widths, but the striking principle remains the same. Even with a wide seven-tooth iron, the force should be directed to the center of the head rather than alternated between its two ends.

Keep the Pricking Iron at 90 Degrees While Striking

The pricking iron must be held at a 90-degree angle in both the front-to-back and side-to-side directions. Even if it appears vertical from the front, a sideways tilt can cause the holes on the back of the leather to move away from the divider line.

When using a European-style pricking iron, align the divider line with the right side of the iron and hold the tool vertically. Set the direction of the pricking iron before raising the mallet. For details on the spacing and correct positioning of No. 7 and No. 9 pricking irons, see How to Use European-Style Pricking Irons: No. 7 and No. 9 Spacing and Correct Punching Positionwhere they are explained in detail.

Do Not Change the Position of the Pricking Iron Between Strikes

When working with thick leather or bonded layers, a single strike may not drive the pricking iron deep enough. Instead of using excessive force, keep the iron in the same position and maintain its vertical angle while dividing the force across the required number of strikes.

If the pricking iron moves after the first strike, do not strike it again immediately. Check and correct its position first. Continuing to strike after the tool has shifted can enlarge the holes or tear their entry and exit points. After punching, pull the iron vertically out of the leather without twisting it.

The Punching Board and Workbench Must Absorb the Impact

The force from the mallet travels through the pricking iron, leather, punching board, and workbench. If the workbench moves or the punching board is too thin, the impact will be lost downward and the same area may need to be struck repeatedly. If the supporting surface is too hard, the teeth can hit it forcefully and become damaged.

The punching board should be placed on a flat, stable workbench so that it does not move during use. If the surface has developed deep grooves, it will no longer support the leather evenly and should be repositioned or replaced. For guidance on arranging the supporting layers to protect pricking iron teeth and reduce noise, see How to Use a Leathercraft Punching Board: Protecting Pricking-Iron Teeth and Reducing Noisefor more details.

Rotate the Workpiece When Punching Curves

Constantly changing the direction of the wrist and mallet while punching a curve makes it difficult to keep the pricking iron vertical. A more stable method is to keep the mallet moving in the same direction while gradually rotating the workpiece to follow the punching line.

On a tight curve, make one set of holes with a two-tooth pricking iron and then rotate the workpiece slightly along the punching line. Turning the curve too sharply in a single movement may make the spacing appear correct on the front while creating irregular holes on the back. Check both the vertical position of the iron and the placement of the next hole before every strike.

Check the Mallet Face and Handle for Wear

The striking face gradually wears with use. If deep grooves develop or one side becomes unevenly worn, the face may no longer meet the pricking iron head correctly. Check the face by hand to make sure it remains flat, and consider replacing it if it is cracked or pieces have broken away.

The connection between the handle and mallet head should also be inspected. If it is loose, the head can move at the moment of impact and change the direction of the force. When not in use, store the mallet away from moisture and separately from pricking irons so that the tools do not strike each other.

A Mallet Is a Tool for Transferring Force Accurately

For a leathercraft mallet, transferring the required force in a consistent direction is more important than producing maximum impact. A flat striking face, appropriate weight, and accurate contact with the center of the pricking iron head are all required to create holes with consistent depth and direction.

If the punched holes are irregular, check the mallet face and weight as well as the condition of the punching board and workbench before replacing the pricking iron. Stable hand stitching begins by treating the mallet, pricking iron, supporting surface, and working posture as one complete set of working conditions.

A leathercraft punching board is placed beneath the workpiece when punching leather with a pricking iron or leather punch. It does more than protect the workbench. It prevents the tool’s cutting edges from striking a hard surface directly and helps reduce rebound and noise during punching.

Even when the same pricking iron is used, the material and condition of the punching board, the levelness of the workbench, and the support beneath the board can affect the depth and position of the holes on the back of the leather. If the board is too soft or tilted to one side, the tool may move during punching even when it is initially held at 90 degrees.

Creating accurate hand-stitching holes requires more than checking the pricking iron. The entire setup, from the workbench to the punching board, must absorb impact steadily, and the depth at which the teeth enter the board must remain consistent.

Why a Leathercraft Punching Board Is Necessary

After the teeth of a pricking iron pass through the leather, they reach the supporting surface beneath the workpiece. Punching directly on a wooden workbench, metal plate, stone slab, or another hard surface can dull or damage the tips of the teeth.

A punching board absorbs the impact while allowing the tips of the teeth to enter its surface slightly. This protects both the pricking iron and the workbench while reducing rebound during striking.

However, driving the pricking iron unnecessarily deep into the board is not recommended. If the teeth become deeply embedded, the tool can be difficult to remove. Rocking it from side to side may enlarge the holes in the leather or bend the teeth.

The strike should stop once the leather has been completely pierced and the tips of the teeth have entered the punching board only slightly.

Cutting Mats and Punching Boards Serve Different Purposes

A cutting mat provides a surface for cutting leather with a knife, while a punching board absorbs the impact of a pricking iron or leather punch. Even when the two products look similar, they may require different thicknesses and impact-absorbing properties.

If a thin cutting mat is used as a punching board, the teeth may pass through it and strike the hard surface underneath. On the other hand, an excessively soft mat may compress and rebound during striking, causing the pricking iron to move away from its vertical position.

Before using a cutting mat for punching, check whether the product is also designed for impact work. If its intended use is unclear, it is safer to use separate surfaces for cutting and punching.

The Support Beneath the Punching Board Must Be Firm and Level

A punching board requires a firm, flat, and stable base. If the workbench is weak or the center of the tabletop vibrates, the striking force may disperse and require several blows in the same position.

Even when using a heavy stone slab or rigid base, never place the leather directly on that hard surface for punching. Place the punching board on the rigid base and then position the leather on top of the punching board.

A rubber pad or vibration-control mat may be used to reduce noise and vibration from the workbench. The soft layer should be placed beneath the rigid base rather than directly beneath the leather.

The basic layering order is as follows.

1. A stable workbench
2. A rubber pad or vibration-control mat
3. A firm, level supporting base
4. A punching board that receives the tips of the pricking iron
5. The leather to be punched

Not every working environment requires exactly the same arrangement. The important points are that the punching board remains level and stable and that the entire workbench does not resonate excessively when struck.

The Punching Board Must Fully Support the Workpiece

When a large workpiece is placed on a small punching board, part of the leather may hang over the edge. Even if the section being punched is on the board, sloping leather around it can make it difficult to check the position and angle of the pricking iron accurately.

Use a punching board large enough to keep the punching area and the surrounding leather flat. When working on a large bag panel, move the workpiece as necessary while keeping the section being punched on a flat part of the board.

Working near the edge of the punching board may cause it to lift or move when struck. Whenever possible, position the punching area near the center of the board.

Check How Deeply the Teeth Enter the Board

The appropriate thickness of a punching board depends on the pricking iron and the thickness of the leather. Instead of treating one specific thickness as correct for every situation, confirm that the teeth do not reach the hard supporting surface beneath the board after passing through the leather.

Before using a new punching board on a finished piece, test it on a scrap of the same leather. Hold the pricking iron at 90 degrees, strike it with appropriate force, and check the following points.

• Check whether the holes on the front and back of the leather are aligned.
• Check whether the tips of the teeth struck the hard surface beneath the punching board.
• Check whether the board compressed excessively or rebounded during punching.
• Check whether the pricking iron can be removed without rocking it significantly from side to side.
• Check whether the punched holes opened wider than necessary.

Rather than using excessive force in a single blow, apply force vertically while checking the thickness of the leather and the progress of the holes. Remove the pricking iron by lifting it vertically instead of twisting it sideways.

For more information about tooth spacing and the correct 90-degree punching position, see How to Use European-Style Pricking Irons: No. 7 and No. 9 Spacing and Correct Punching Positionfor detailed guidance.

Keep the Pricking Iron Vertical on Both Straight Lines and Curves

For a straight section, place the workpiece flat on the punching board and hold the pricking iron at 90 degrees to the leather surface. Check the actual position of the teeth where they touch the leather instead of looking only at the handle, and then strike vertically.

Each time the tool is moved to the next position, check that the leather remains on a flat area of the board. Even when one tooth is placed in an existing hole, make sure that grooves or depressions in the board do not cause the tool to tilt.

When following a curve, rotate the workpiece instead of tilting the pricking iron in the direction of the curve. Keep the tool vertical and turn the leather gradually to follow the divider line.

For a tight curve, punch one step at a time with a two-tooth pricking iron and rotate the workpiece slightly after each strike. Adjust the positions of both the workpiece and the punching board so that the punching area remains near the center of the board.

Do Not Repeatedly Use Only One Area of the Board

Repeatedly striking the same area creates concentrated holes and deep grooves in the surface. Leather will no longer lie flat over a deeply worn section, and the teeth may slip into existing marks.

Move the working position gradually so that the entire board wears evenly. If the product is designed for double-sided use, it may be turned over after both surfaces have been inspected.

However, if the board is warped or deep grooves on one side affect the opposite surface, it is safer to replace the board rather than continue using it after turning it over.

When to Replace a Punching Board

A punching board is a consumable work surface that receives the tips of punching tools. Visible marks alone do not mean that it must be replaced immediately, but an uneven surface can affect punching accuracy.

Consider replacing the punching board if any of the following conditions appear.

• Deep grooves prevent the leather from lying flat.
• The center of the board has sunk or the entire board has warped.
• The teeth repeatedly slip into existing holes or grooves.
• Parts of the surface have hardened or cracked.
• The board has become thin enough for the teeth to reach the supporting surface underneath.
• Rebound and impact noise have increased compared with previous use.

Placing a new punching board beside the used one makes it easier to compare their surface condition and thickness from the side.

How to Reduce Punching Noise and Vibration

Leathercraft punching noise is not determined by the punching board alone. If the workbench moves or has a hollow tabletop, impact noise and vibration may travel more easily through the structure.

A heavy and stable base helps prevent the striking force from dispersing. Placing a vibration-control mat beneath that base can help reduce the vibration transmitted to the workbench or floor.

Stacking several soft mats directly beneath the leather may appear to reduce noise, but it can cause the tool to rebound or tilt. To maintain punching accuracy, place a suitable punching board directly beneath the leather and position vibration-control material beneath the rigid base.

It is difficult to eliminate punching noise completely. Instead of striking excessively hard simply to reduce the number of blows, transfer the necessary force accurately through a stable supporting setup.

How to Choose a Leathercraft Punching Board

When selecting a punching board, consider the tools and the size of the workpieces you use rather than looking only at the price or dimensions.

First, confirm that the material is intended for punching and will not break easily when struck by a pricking iron.

Second, the board must be thick enough to prevent the tips of the teeth from reaching the hard base underneath.

Third, choose a size that allows the leather parts you make most often to lie flat.

Fourth, the surface must be flat, and the board should not slide easily on the workbench.

Fifth, a product that can be replaced easily with the same size is more convenient to maintain over time.

A board that is too hard may damage the tips of the teeth, while one that is too soft may allow both the leather and the tool to move. If the product description is insufficient, judge its suitability by testing it on scrap leather.

How to Maintain and Store a Punching Board

After punching, remove leather dust and debris from the board. Fragments trapped in deep grooves may prevent the next workpiece from lying flat.

Store the punching board flat and away from strong heat and direct sunlight. Leaning it against a wall or placing uneven weight on part of it may cause it to warp.

Using separate boards for cutting and punching prevents knife cuts and punching marks from accumulating on the same surface. Follow the product’s care instructions instead of heating the board or cleaning it with strong solvents.

Common Mistakes Made by Beginners

The first mistake is punching leather directly on a wooden workbench or stone slab. The tips of the teeth may strike the hard surface and become damaged.

The second mistake is using a thin cutting mat as a punching board. The teeth may pass through the mat and strike the supporting surface underneath.

The third mistake is stacking several excessively soft mats directly beneath the leather to reduce noise. Rebound may cause the pricking iron to move and shift the positions of the holes on the back.

The fourth mistake is repeatedly using the same part of the punching board. When punching over a deep groove, the leather can sink and the teeth may slip sideways.

The fifth mistake is driving the pricking iron too deeply into the board. Once the leather has been pierced, the tips should enter the board only slightly, and the tool should be removed vertically.

Punching Accuracy Depends on Both the Tool and the Board

Creating accurate hand-stitching holes requires checking not only the spacing and angle of the pricking iron but also the condition of the punching board beneath the leather.

A punching board protects the tool and the workbench while absorbing impact. Place it on a firm and stable base, and add a vibration-control mat beneath the rigid base when necessary.

Keep the workpiece flat on the punching board and hold the pricking iron at 90 degrees throughout the process. On curves, rotate the workpiece instead of tilting the tool.

Replace the punching board when deep grooves or warping prevent it from supporting the leather evenly. Consistent hand-stitching lines depend on checking the levelness and wear of the punching board as carefully as the pricking iron and the leather.

A leathercraft needle is not simply a tool for carrying thread through leather. If the needle thickness, eye size, and tip shape do not match the thread and stitching holes, unnecessary resistance occurs with every stitch. This can wear the thread or enlarge the holes in the leather.

Even with the same leather and thread, the choice of needle affects the resistance felt by the hands, stitching speed, and stitch alignment on both the front and back. Choosing a good needle is not about buying the most expensive product. It is about finding the right combination for the thread and stitching holes being used.

the reason saddle stitching lasts longer than machine stitching—the answer lies in its structure, where two needles attached to opposite ends of a single thread cross through the same hole. Both needles must therefore pass steadily through the same hole without piercing the thread already inside it.

Leathercraft Needles Are Not Designed to Create New Holes

Ordinary fabric-sewing needles have sharp points that pass directly between woven fibers. In contrast, leathercraft needles used for saddle stitching carry the thread through holes that have already been made with a pricking iron or awl.

If the needle tip is too sharp, it may leave the existing hole and create a new path through the leather. It may also pierce the thread that has already passed through from the opposite side. When the thread is pierced, moving to the next stitch becomes difficult, and pulling it by force can damage its surface.

For leather hand-stitching, a needle with a rounded and smoothly finished tip is generally suitable. The rounded tip follows the direction of the existing stitching hole while reducing damage to the leather fibers and thread.

A Rounded Needle Tip Must Still Have a Smooth Surface

Not all round-tipped needles have the same quality. Fine scratches or rough areas on the tip or shaft can scrape the thread and leather as the needle passes through the hole.

Slowly run your fingers along the needle tip and shaft to check for rough spots. If the needle catches fibers when lightly passed through a soft cloth, its surface may contain a small scratch or burr.

Continuing to use a needle with a bent or flattened tip repeatedly presses against one side of the stitching hole. If the needle keeps moving in an unintended direction inside the leather or the thread frays without an obvious reason, inspect the needle surface and tip first.

The Needle Eye Must Match the Thread Thickness

When Considering Leathercraft Thread Thickness and Pricking-Iron Spacing—once this has been determined, check whether the thread passes through the needle eye without excessive force.

If the needle eye is too small, threading becomes difficult and the thread rubs against the edge of the eye every time it passes through. When the thread is pierced to lock it onto the needle, the secured section becomes two or more layers thick and takes up more space during actual stitching.

If the needle eye is excessively large, the needle shaft is often thicker as well. Repeatedly passing a thick needle through small stitching holes can enlarge them and place unnecessary pressure along the stitch line.

After attaching the thread to the needle, check that the secured section does not protrude far beyond the thickness of the needle shaft. A smooth transition from the needle to the thread reduces resistance as it passes through the stitching hole.

The Needle Must Not Be Thicker Than the Stitching Hole

Why awl holes determine stitch quality—the size and direction of the passage followed by the needle and thread determine where each stitch is positioned.

A properly selected needle should pass through with reasonable hand pressure without enlarging the stitching hole. A tool may occasionally be needed around an especially thick section, but if pliers are required for every hole, recheck the relationship between the needle and hole size.

If the leather surface lifts or the hole expands into a round shape every time the needle passes through, the needle may be too thick. If the needle is too thin and flexible, it may bend while passing through several layers and make it difficult to emerge accurately through the hole on the back.

Needle thickness should not be determined in isolation. Consider the total assembled leather thickness, the size and shape of the stitching holes, the thread thickness, and the stability of the needle when it is held and pushed through the leather.

Thick Leather Does Not Always Require a Thick Needle

Where several leather layers are joined, the needle must travel through a longer passage and encounters greater internal friction. Replacing it with a thicker needle simply because it does not pass easily may enlarge the stitching holes even further.

First confirm that the holes on the front and back are connected in the same direction. If the components shifted during gluing or the awl was tilted, even a thin needle will not pass through naturally.

In a thick joint, it is safer to realign the existing passage with an awl before inserting the needle than to force the hole wider with the needle itself. The goal is not to create a new hole, but to ensure that the existing holes on the front and back form one continuous passage.

Thicker leather does not automatically require a thicker needle. What is needed is a needle with enough rigidity to resist bending while remaining thin enough not to enlarge the existing holes.

Problems Caused by Needles That Are Too Thick or Too Thin

A needle that is too thick can cause the following problems:

• Excessive force is required to pass through the hole.
• The stitching hole becomes larger than its original size.
• The leather surface lifts as the needle passes through.
• The stitch line becomes distorted around curves or corners.
• The hole remains visibly large even after the thread has been tightened.
• Finger and wrist fatigue increases during long stitching sessions.

A needle that is too thin can cause the following problems:

• The needle bends easily while passing through several leather layers.
• It becomes difficult to maintain a stable direction while locating the hole on the back.
• A small needle eye creates friction against thick thread.
• The needle shaft may deform when the needle is pulled forcefully.
• The narrow gripping area may make the needle more difficult to control.

Needle thickness cannot be judged by the product number alone. Numbering systems and actual dimensions vary between manufacturers, so the needle must be tested with the thread and stitching holes that will be used.

The Inside of the Needle Eye Must Also Be Inspected

Even if the outside of the needle eye appears smooth, a rough inner edge can scrape the same section of thread with every stitch. The problem may not be visible at first, but along a long stitch line the thread surface can gradually fray and its twist may loosen.

Before using a new needle, insert a short piece of thread through the eye and move it back and forth several times. If a particular section of thread begins to fray or lose color, inspect the finish inside the needle eye.

A needle with a deformed eye or visible rust should not remain in use. It may leave metal marks on the leather surface or stain light-colored thread.

The Thread Attachment Must Be Compact and Smooth

For saddle stitching, the thread is often pierced and locked onto the needle so that it does not slip out of the eye. Overlapping the thread too many times or creating a large knot makes the section behind the needle excessively thick.

A bulky attachment rubs against the leather every time it passes through a hole and may disturb the thread’s twist. On light-colored leather, wax and thread residue may also collect around the stitching holes.

The thread should be secured firmly enough not to slip from the needle, while the transition from the needle shaft to the thread remains as flat as possible. Even a stable bonded thread such as Vinymo MBT can create excessive resistance if the attachment around the needle is too bulky.

When using wax, do not concentrate a large amount in one area. Apply only the necessary amount in a thin, even layer to prevent buildup on the thread surface and around the needle eye.

Saddle Stitching Requires Two Needles in the Same Condition

Saddle stitching uses a needle on each end of a single thread, with both needles crossing through the same hole. The two needles should therefore have the same thickness, length, and tip condition so that hand movement and passing resistance remain consistent on both sides.

If one needle is new while the other is bent or worn, they may follow different paths even when the same force is applied. When replacing needles, inspect both together and replace them as a pair when their conditions differ significantly.

If a needle bends during work, repeatedly forcing it back in the opposite direction can cause metal fatigue and sudden breakage. Replace the needle if the tip is damaged or the shaft shows visible deformation.

Choose the Needle After Test-Stitching the Actual Materials

Do not make the final needle choice based only on the number printed on the package. Prepare a test piece using the leather, reinforcement, and lining in the same order and combined thickness as the actual project.

Check the combination in the following order:

1. Determine the thread thickness and pricking-iron spacing for the project.
2. Choose a needle whose eye accepts the thread without excessive force.
3. Attach the thread to the needle using the same method that will be used during stitching.
4. Make stitching holes of the same size as those planned for the project.
5. Check whether the needle passes through without enlarging the holes.
6. Inspect both the front and back to confirm that the stitches sit consistently.
7. Sew at least ten stitches and check for thread wear and hand fatigue.
8. Bend the test piece and check whether the holes stretch or the thread rises above the surface.

A needle may appear to pass smoothly during a short test, while hand fatigue and thread wear accumulate along a longer stitch line. When stitching a long perimeter such as that of a bag, consider not only how easily the needle passes but also whether it maintains the same performance throughout the work.

A Good Needle Works Invisibly Between the Thread and Hole

A properly selected needle does not force the stitching holes wider or damage the thread. It follows the intended passage and connects the front and back consistently.

If stitching requires excessive force, the thread repeatedly frays, or the needle continues to bend, do not assume that hand technique is the only cause. Recheck the needle thickness, eye size, tip shape, and relationship between the thread and stitching holes.

The key to choosing leathercraft needles is not memorizing a particular size number or brand. It is finding a combination in which the thread is secured properly in the eye, the needle does not distort the stitching holes, and both needles move with the same resistance.

The needle is not visible in the finished piece, yet it passes through every stitch. When the needle, thread, and stitching holes are properly balanced, the rhythm of hand-stitching becomes stable and only the intended stitch line remains on the leather surface.