Hacksaw

Hacksaw

Training For War Work- Chiswick Polytechnic, Turnham Green, 1941 D3792

Hacksaw is a fine-toothed saw, originally and principally made for cutting metal. They can also cut various other materials, such as plastic and wood, depending on the blade selected. Hacksaws consist of a frame that holds a blade under tension, and they are an essential tool in both metalworking and woodworking, although their use in woodworking is less common. The versatility of the hacksaw comes from the wide variety of blades that can be fitted to the saws, allowing them to cut through materials of different hardnesses and densities.

Design and Operation

A typical hacksaw is hand-powered and has a C-shaped frame that holds a blade under tension. The blades are usually made from high-speed steel or bi-metal and have a series of fine teeth with varying tooth pitches to suit different cutting requirements. The user can adjust the blade tension using a screw or a lever on the frame, which ensures optimal cutting performance and blade life. The frame may also allow for the blade to be mounted at different angles, typically 45 or 90 degrees, to facilitate cutting in tight spaces or making flush cuts.

Blade Types and Selection

The selection of the blade for a hacksaw is crucial and depends on the material to be cut and the desired finish. Blades are characterized by their tooth count, measured in TPI (teeth per inch), and their material. A higher TPI blade is used for cutting thinner materials to ensure a smoother cut, while a lower TPI blade is suited for thicker materials. Specialized blades, such as those with raker or wavy tooth set patterns, are designed for specific materials or cutting actions.

Applications

Hacksaws are commonly used in the metalworking industry for cutting pipes, tubes, and bars. They are also used in construction for cutting structural steel, and in plumbing for cutting pipes and fittings. In addition to these industrial applications, hacksaws are a staple in home workshops and are used for a variety of DIY projects and repairs.

Safety Considerations

When using a hacksaw, it is important to wear appropriate PPE, such as safety glasses to protect the eyes from flying debris. The workpiece should be securely clamped to prevent movement during cutting, and the user should apply steady pressure and use consistent strokes to ensure a clean cut and reduce the risk of blade breakage.

Maintenance

To maintain a hacksaw, it is important to regularly check the blade for wear and replace it as needed. The frame and tension mechanism should also be inspected for damage or wear. Proper storage is important to prevent damage to the blade and the saw.

See Also

• Saw
• Metalworking
• Woodworking
• Tool maintenance