CNC Drag Knife ⚙️

A CNC (Computer Numerical Control) drag knife is a specialized cutting tool designed for the precise cutting of thin, flexible materials like vinyl, paper, cardstock, and thin plastics. It is commonly used with CNC routers, plotters, and other CNC machines to achieve detailed and intricate cuts. Unlike conventional cutting tools, a drag knife is dragged across the material rather than pushed down, enabling it to cleanly slice through without tearing or bunching.

How a CNC Drag Knife Works

The CNC drag knife features a small swivelling blade mounted on a holder, which attaches to the CNC machine’s spindle or cutting head. As the machine follows a programmed cutting path, the blade swivels automatically to maintain the correct orientation, ensuring smooth and precise cuts, even around curves and intricate shapes. This swivel action is key to preventing damage to delicate materials.

Advantages of Using a CNC Drag Knife

• Precision and Accuracy
  Paired with a CNC machine, drag knives create intricate shapes and detailed patterns with high precision, making them ideal for applications where accuracy is essential.

• Clean Cuts
  The swivelling blade action results in smooth, clean edges without tearing or bunching the material, offering a professional finish.

• Reduced Wear
  Drag knives are optimized for thin, flexible materials, providing greater durability and longevity when used for their intended purpose compared to standard cutting tools.

• Versatility
  CNC drag knives are compatible with various CNC machines and can handle a broad range of materials, making them suitable for industries such as sign-making, stencil creation, and crafting.

Limitations

CNC drag knives are designed specifically for thin, soft materials and are not suitable for cutting harder or thicker materials like wood, metal, or dense plastics. For these tougher materials, tools like end mills, laser cutters, or plasma cutters are more appropriate, as they provide the necessary cutting force.

A CNC drag knife is an essential tool for precision cutting of thin, flexible materials. Its swivelling blade and compatibility with CNC machines make it perfect for detailed, clean cuts in applications like sign-making and crafting. While it excels in cutting delicate materials, it is not suited for thicker or harder substrates.