What Is a Core Drill?
Core drills are commonly used in construction sites to bore large cylindrical holes in materials such as concrete, plasterboard, mortar, bricks, and more.
Core drills can drill holes in various construction materials by simply changing the cutting edge. They play a crucial role in home construction for tasks like air conditioner installation, water piping, and electrical wiring. These drills can efficiently create large-diameter holes that ordinary drills cannot achieve in a single attempt.
Uses of Core Drills
Drill bits are limited in their ability to drill holes larger than 100 mm in diameter and are restricted to specific materials. Core drills, on the other hand, can be attached to electric hammer drills, allowing for the selection of cutting edges tailored to the material being drilled.
There are various types of core drill cutting edges, including the “multi-type” for diverse materials like reinforced plastic, siding, and PVC pipe, as well as the “for ALC” type, which is hard and features reinforcement striations, making it suitable for challenging materials.
Principles of Core Drills
Core drills are categorized as wet or dry type drills. Dry type drills do not require water and can be used in various environments without the need for curing. Wet processing, on the other hand, utilizes water for high-speed drilling, prolonging blade life, but necessitates proper drainage and curing conditions, along with a separate water supply facility.
In addition to the ALC and multi-type drills mentioned earlier, there are “vibration core drills,” which utilize vibration to drill holes while crushing the material, and “composite core drills,” capable of drilling holes in multiple materials simultaneously, including metal and insulation materials. Vibration drills are ideal for hard-to-machine materials and leave clean holes with minimal cracking.
Composite core drills excel in drilling holes in walls constructed from diverse materials, a task challenging for vibration-type drills, and even in wood containing nails.