Annular Cutter

The annular cutter is a specialized drill bit for drilling steel. Like the hole saw for wood, the annular cutter only cuts the outer edge of the hole. Creates accurate and burr-free holes to narrow tolerances without pre-drilling or step drilling. As the cutter rotates, it produces chips from the outer cutting edges, and when the hole is cut, a chip falls out, which is a circular piece of steel from the center of the cutter. annular drill bits are hollow steel drill bits that cut only the hole diameter needed, as opposed to removing all material from inside the hole like traditional drills. Reducing the amount of material removed allows for quick drilling of heavy steel profiles, the ability to drill steel much faster than ordinary steel drill bits, and faster cleaning.

The Annular Cutting Process explained

Annular cutting, or cutting metal with a hollow drill bit, is an effective way to create holes up to five inches in diameter with an accuracy of +0.004 inches in steel, stainless steel, and so on. Some cutters only cut material around the periphery of the hole to form a solid piece of metal. The wall thickness of the cutter is about a quarter of an inch thick, which means that no matter what size of hole you cut, you only remove a small amount of material around the edge of the hole. Because the cutting face of annular cutters is distributed over many cutting edges, they stay sharper longer and can create 5 to 10 times more holes than conventional annular cutters. The end holes are smooth and burr-free - no reaming is required. Besides, cutting holes with annular cutters does not require pre-drilling or step drilling. annular cutters are commonly used for on-site repair and for making mechanical and through holes in pipes.

What kind of Annular Drill Bit should I use?

When choosing the drill bit type one needs to consider the size of the hole, the width of the cut, and the type of material. A broad variety of annular cutters were designed for cutting materials such as carbon steel, stainless steel, aluminum, titanium, and others. When deciding the size of the annular bit, the depth and diameter of the cutter are determined. If you look at an actual cutter, the depth is greater than it is judged (one-inch cutter is 1-1/4 inch) as this ensures the tool can drill through the hole and allows for extra length to re-sharpen. Let's take a closer look at the most important issues:

Hole size

Annular bits are suitable for holes up to 1/2 inch in diameter. Holes larger than 1/2 inch are better made of annular cutters. annular cutters are available in more accurate diameters-annular cutters in increments of 1/16 inches, while annular cutters are available in increments of 1/32 inches. 

Hole Type

Annular cutters are suitable for blind holes in applications where the hole does not have to move through the object completely. They are also good candidates for making lead holes while tapping as annular cutters are available in more precise fractional sizes. Less friction and drift occur during annular cutting, leaving a more symmetrical and precise hole. Applications with overlapping holes are often simpler to handle with annular cutters.

Hole Location

In addition to the above-mentioned drilling capability offered by portable drills and annular cutters, the location and completion of the hole is another factor. annular cutters drill holes that are otherwise difficult or impossible with twist drills-no pre-drilling or phase drilling is needed. annular cutters are also perfect candidates for applications where a burr-free finished hole is needed. This involves drilling cylinders or cylinders where it is difficult or impossible to use special instruments or hand scratching in the middle of a hard-to-reach cylinder.

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