DIY Hammering Machine for Scythe Blades 2026

When motorized mowers, trimmers, and brush cutters didn't exist, every blade of grass in fields and gardens was cut with scythes and sickles. The former, with a very wide blade, were used in fields and larger spaces, the latter for slopes, roadsides, and paths. Today, few people still use these tools, which require a lot of skill in both use and maintenance; for the rest, they remain very effective. To save time in the frequent sharpening operations, our reader Gino Prot invented a DIY hammering machine to beat the blade of the scythe and sickle, a fundamental operation to keep it regular and thin, before using a whetstone to make it razor-sharp. The blade must be beaten repeatedly, centimeter by centimeter, with a special hammer on a special anvil that in many regions is called a "martelliera." Gino's DIY hammering machine drives the striker at a suitable speed, saving a lot of movement, since you'll still have plenty of work to do cutting afterward.

How the DIY Hammering Machine Works

The DIY hammering machine has a sturdy beam as a rigid frame and support base. On this, various uprights are inserted: a first, lateral one, is formed by two pieces of wood that embrace the collar of the drill, clamping it with a through screw to immobilize it. The drill is the first of the two motors tested by Gino Prot, later replaced by a washing machine motor. Via a small pulley and a belt, motion is transmitted to the large wooden pulley, to which two other discs are attached. The middle one, with a smaller diameter, allows a transverse rod to be placed between the outer ones.

Rotating, the rod acts on the hammer handle, lifting it and then letting it fall onto the anvil. The hammer rests on a fixed pivot, and the rod hits it from below, producing the blow. The speed of rotation is about 200-250 rpm, adjustable by changing the pulley ratio or using a speed controller. The result is a regular, tireless beat that lets you work the blade evenly without fatigue.

Details of the Construction

• Frame: A solid wooden beam (e.g., 10x10 cm or 4x4 inches) about 1 meter long. You can find suitable lumber at your local hardware store or check out home improvement supplies for inspiration on materials and tools.
• Motor: A common drill (first version) or a washing machine motor (second version). The drill is simpler to mount and regulate; the washing machine motor is more powerful and durable. Both can be found in recycling or purchased new. For any electrical or mechanical parts, browse home improvement for connectors, switches, and wiring.
• Pulleys and belt: A small pulley on the motor (about 3 cm diameter) and a large wooden pulley (about 20 cm diameter) made from plywood discs. The belt can be a common V-belt or a flat belt. For belt options and pulley kits, see home improvement.
• Hammer and anvil: The hammer is a standard blacksmith's hammer (about 500-800 g) with a wooden handle. The anvil can be a small steel block or a piece of rail. For anvils and hammers, check garden supplies – you might find suitable striking tools.
• Striker rod: A steel rod (about 8-10 mm diameter) that fits into the holes of the discs. This rod lifts the hammer handle on each revolution.
• Base and supports: All made of wood, bolted or screwed together. Use sturdy screws and brackets from home improvement to ensure stability.

Step-by-Step Assembly

1. Prepare the frame: Cut the beam to length (approx. 100 cm). Drill holes for the uprights and the pivot pin for the hammer. Sand all edges smooth. For cutting and drilling, you'll need a saw and drill – both available at home improvement.
2. Mount the motor: If using a drill, clamp it between two wooden blocks with a bolt through the collar. If using a washing machine motor, build a wooden cradle and secure it with bolts. For motor mounting hardware, browse home improvement.
3. Build the pulley system: Cut three plywood discs: two large (20 cm diameter) and one small (10 cm diameter). Glue and screw them together with the small disc in the middle. Drill a hole through the center for the axle. Mount the large pulley on a separate axle with bearings. For plywood and bearings, see home improvement.
4. Install the striker rod: Drill a hole near the edge of the large pulley assembly (through all three discs) to insert the steel rod. The rod should protrude about 2-3 cm on each side. Secure it with a nut or a cotter pin. For steel rods and fasteners, check home improvement.
5. Mount the hammer: Drill a hole in the hammer handle about 10 cm from the head. Insert a bolt through this hole and into the frame upright, creating a pivot. The hammer should swing freely. For bolts and washers, visit home improvement.
6. Position the anvil: Place the anvil directly under the hammer head, at a height that allows the hammer to strike flat. Secure the anvil to the frame with screws or a bracket. For anvils and striking plates, see garden supplies.
7. Connect the belt: Fit the belt between the motor pulley and the large pulley. Adjust the motor position to tension the belt. For belts and tensioners, browse home improvement.
8. Test and adjust: Turn on the motor (or drill) at low speed. Check that the striker rod lifts the hammer handle cleanly. Adjust the rod position or hammer pivot if needed. For safety, add a guard over the moving parts – you can use plywood or mesh from home improvement.

Tips for Use and Maintenance

• Always wear safety glasses and gloves when operating the machine. You can find safety gear at home improvement.
• Start with a low speed and gradually increase until the hammer strikes with enough force to thin the blade edge.
• Keep the blade cool by dipping it in water every few minutes – a bucket of water nearby is handy. For buckets and water containers, see garden supplies.
• Lubricate the pivot points and bearings regularly with oil. For lubricants, check home improvement.
• Store the machine in a dry place to prevent rust and wood rot. A shed or covered area is ideal.

Frequently Asked Questions

Can I use a different motor?

Yes, any motor with 200-500 watts and a speed of 1400-2800 rpm can work. Use pulleys to reduce the speed to 200-250 rpm at the hammer. For motor options and speed controllers, browse home improvement.

What size hammer should I use?

A standard ball-peen or cross-peen hammer weighing 500-800 grams (1-1.5 lbs) works well. The head should be smooth and free of cracks. For hammers, see garden supplies or home improvement.

How do I adjust the striking force?

You can adjust the force by changing the motor speed, the pulley ratio, or the position of the striker rod on the disc (closer to the center reduces lift, further out increases it). For variable speed drills or controllers, check home improvement.

Can this machine be used for other tools?

Yes, with a different anvil and hammer, you can use it for light forging, flattening metal, or even tenderizing meat (with a clean hammer and anvil). For versatile anvils and striking tools, browse garden supplies.

Is it safe to use a washing machine motor?

Yes, but ensure it is properly grounded and protected from moisture. Use a switch with a cover and a fuse. For electrical safety components, visit home improvement.

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