What’s a hollow drill?

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A hollow drill is a mechanical device that uses hollowed out cylindrical bits and is used for the purpose of drilling holes through various objects and surfaces. These spikes can be made from different types of strong metal and come in a variety of shapes and sizes. Hollow bits are used in many industries and for a variety of purposes.

One of the most common types of hollow drill is a paper drill made to “punch” holes through stacks of paper. Typical drill bits are bad to use for this application simply because the paper is delicate and they tear through it rather than making fine holes. The hollow bits used in a paper drill are smooth, hollow, and cylindrical with a razor-sharp edge for cutting paper. These allow paper that has been pulled out of the holes to be easily removed through the hole in the drill bit rather than creating a lot of paper dust. Any number of hollow bits, typically one to six, but possibly more, can be arranged in a row on a hydraulic drill press.

Items needing to be drilled, which can be a stack of paper or cardboard, are then placed in the desired location under the bits. The machine operator will then safely activate the machine to drive the rotating bits down and through the objects. Once completed, the spikes return to an upright position along with the paper that has been pulled out of the holes. When the process is repeated, the waste paper is pushed up through the drill bits and out of the machine into a waste container. Usually a substance such as wax must be applied to the drill bit when it is in use to prevent it from overheating due to friction.

At the opposite end of the spectrum, hollow drills can also be used to drill holes in hard, dense materials like rocks. In this case, the hole in the drill bit exists for the purpose of pumping liquid, such as water, while drilling to preserve the integrity of the hollow drill bit until the desired depth is reached. The purpose of this is typically to create blast holes to blast rocks that need to be cleared from a large area, but there can be many reasons for drilling holes through dense materials.

For science, a hollow drill rod can be used to extract sample material from the ground for study. The drill is dug into the ground or ice, for example, and when it’s mined, a scientist can save the sample for study. This is mostly used when studying the effects of an area over time, as the sample will represent how the dirt composition has changed, perhaps even over millions of years.

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