![]() The main advantage over conventional drill bits is the hole saw's efficiency, because very little of the total material being removed is actually cut, which ultimately reduces the overall power requirement. This type is available in sizes up to 300 mm (1 ft) and larger, and can be used to accurately cut large circles. To cut out a hole of any size, the teeth need only be adjusted to the proper position. By snapping the blades into different grooves on the disc, a hole saw of a wide variety of sizes can be constructed.Ĭircle cutter Hole saw circle cutterĪnother type of adjustable hole saw, also called a circle cutter, is formed by having one, two, or three adjustable teeth on a platform with a pilot bit. Types Adjustable Adjustable hole sawĪn adjustable hole saw consists of a number of thin metal saw blade-like strips, and a flat disc with a large number of grooves in one side and a shank on the other. Diamond hole saws are used to bore holes in brick, concrete, glass, and stone. Saw teeth are used for most materials, such as wood, plastic, soft plaster, and metal. By breaking the core off from time to time and using a shank extension, a diamond core drill can drill to depths many times its length. A 300 mm (12 in) cylinder length is not uncommon, although shorter bits are usual. ![]() The only limit on the length of the cylinder, and thus depth of the hole, is the need to remove the bit from the hole to clear dust. Holes saws for use with portable drills are commonly available in diameters from 6 to 130 mm, or in the US, ¼ to 6 inches. The kerf of the cut is designed to be slightly larger than the diameter of the rest of the hole saw so that it does not get jammed in the hole. The sloping slots in the cylinder wall help carry the dust out. After the first few millimeters of cut, the centering mechanism may no longer be needed, although it will help the bit to bore without wandering in a deep hole. The arbor can carry a drill bit to bore a centering hole. The cutting edge either has saw teeth formed in it or industrial diamonds embedded in it. The saw consists of a metal cylinder, usually steel, mounted on an arbor. (angled-) rooftop constructions also a depth 165 and 300 mm is possible.Ĭutting with a hole saw is analogous to some machining operations, called trepanning in the trade, that swing a cutter analogous to a fly cutter in order to achieve a similar result of annular kerf and intact core. Common hole saw depths are 38, 45 and 60 mm and for drilling through e.g. ![]() ![]() However, longer aspect ratios are available for applications that warrant them. Most hole saws have a fairly short aspect ratio of diameter to depth, and they are used to cut through relatively thin workpieces. The depth to which a hole saw can cut is limited by the depth of its cup-like shape. The same hole can be made faster and using less power. The fact that a hole saw creates the hole without needing to cut up the core often makes it preferable to twist drills or spade drills for relatively large holes (especially those larger than 25 millimetres (1.0 inch). Hole saws typically have a pilot drill bit (arbor) at their center to keep the saw teeth from walking. Tungsten carbide hole saw with arbor A 52 mm (2.0 in) hole saw with pilot bit A 115 mm (4.5 in) diamond hole sawĪ hole saw (also styled holesaw), also known as a hole cutter, is a saw blade of annular (ring) shape, whose annular kerf creates a hole in the workpiece without having to cut up the core material.
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