Using Core Drills: Key Details to Understand

Those who work in certain sectors know well the value of core drills, precision tools that allow you to create holes and export the resulting material that presents itself in cylindrical form and not with the classic condition of chips. In the images below, taken from the official Krino catalog, you can perfectly understand the advantage and the machining mechanism.

The structure of the core drills (or core drill bits) is clear: there is a cylindrical body that performs the cutting thanks to teeth in HSS with cobalt percentage or TiAIN (titanium nitride and aluminum coating) depending on technical requirements and the material to be drilled.

Why are core drills useful?

They are tools that allow you to work with extreme precision and cleanliness. Most importantly, core drills are very efficient on large diameters. This is because the tool removes only the outer ring of the material you are working on. A condition that automatically requires less power and generates a lower amount of heat compared to traditional drill bits.

Which tools to use these drill bits?

On the core drill bits we have the shank, which as with Krino models can be a Weldon solution, with two flat sections that allow the drill bit to stop both on dedicated machines and on column drills thanks to a specific adapter.

In any case, to work best with these core drill bits, we have specific drills like those from Krino, which accommodate diameters from 12 to 32 millimeters, and allow you to adjust the speed with rotation reversal. On the other hand, with the right adapters you can also use tapping drills, standard drill bits for drilling metal, countersinks.

How to use core drills

For advice on how to use these tools, just take a look at this Krino video that highlights a drilling activity with the drill tips of the core drill bit series of 30 and 50 millimeters length. The alternating roughing and finishing teeth allow you to get the best possible result in terms of precise and clean drilling. Even on thick materials.

To start your drilling activity with these extreme precision tools you must fix the attachment to the machine with the two screws. Start the rotation and descend vertically with the right speed for your work on surfaces of different thickness.

If the drill bit requires it, use the right emulsion oil to simplify the work and obtain a result done according to the rules without putting the drill bit under unnecessary stress. By the way, if you don't like the complexity of the Weldon attachment, you can opt for the simplified fitting solution: very practical and fast. You find everything in the Krino catalog, choose the best drill bits for your precision drilling work.