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Countersinks are cone-shaped holes drilled into objects to fit screw, bolt, or nail heads. They come in various styles and sizes, with bevel angles ranging from 60 to 120 degrees. Countersinks remove sharp edges and can increase strength in sheet metal applications. Special tools, such as cross hole and slotted countersink cutters, are used for cutting countersinks. Back countersinks are used for hard-to-reach spots.
A countersink is a cone-shaped hole drilled into an object so that the head of a screw, bolt, or nail is flush with the surface. The tool used to cut countersinks is also referred to as a countersink and comes in many styles. Countersinks are very similar to countersinks, where a shallow, round hole is drilled over a smaller hole to fit the head of a bolt. Countersinking can be a very beneficial procedure, because it removes sharp edges caused by the heads of screws, bolts or nails protruding from the surface of an object.
The bevel angles of a countersink can vary, depending on the tool used or the bevel angle of the screw or bolt. Typically, chamfer angles are 60, 82, 90, 100, 110, or 120 degrees, with the angle measured from both ends of the hole opening. Countersinks are typically tapered, which is referred to as a plunge application. Some countersinks have bevelled edges to allow for the intersection of two different planes.
Another type of flaring method is known as form flaring, which is used exclusively in sheet metal applications. This type of countersink effectively increases strength as multiple countersinks are pushed together. The two methods of producing such countersinks are known as modified radius dimples and coin dimples.
Performing a flaring operation requires a special flaring tool. Countersink drill bits come in a wide variety of sizes and angles to fit almost any screw or bolt head, and are typically used on milling machines. These pieces are not unique to the mill, however; countersink bits can also be used on drill presses, drill presses and lathes.
One type of countersink tool is known as a cross hole countersink. This is a conical device with a hole in one side of the cone. This hole is a very important part of the tool, because it not only creates a cutting edge, but also provides an area for spent materials, such as sawdust and metal shavings, to collect. This tool is not fully symmetrical, which prevents the entire cone from rubbing against the chamfer, so the hole can be used as a cutting edge.
The cross hole cutter, however, is not used for most cutting applications. Instead, it is used for finishing work where a sharp tool is not needed. When countersinks are actually being cut, a slotted countersink cutter is the tool that is used. This tool is somewhat similar to a cutter for a milling machine, but has the shape of a cone. The cone itself has a variety of angles, which are typically the six common angles: 60, 82, 90, 100, 110, or 120 degrees.
Another type of tool is the back countersink, which is often used to access hard-to-reach spots. This consists of two components: a rod and the bit itself. The rod is positioned where the flaring procedure is to take place, and then the tip itself is added onto the rod.
