Excision HSS-Co Core Drills

Posted by ACL Team on 14th Jun 2024

Excision offers an extensive selection of core drills with a unique geometry that makes drilling easier for longer. A core drill is a specialised tool for drilling through steel. It produces accurate burr-free holes to close tolerances without pre-drilling or step drilling. It can drill a much larger hole and requires less force and time than a standard twist drill bit. As it turns, the drill produces chips from the outside cutting edges and after cutting the hole a ‘slug’ (a round chunk of steel from the centre of the cutter) falls out.

Benefits of the product:

- High-Speed Steel (HSS) material and 5% cobalt composition

- Fast cutting

- Burr-free finish

- Longer Lasting

- Drills harder materials
- Multi Fit - Fits all makes of magnetic based drill including all quick change systems

- Thinner wall construction for faster drilling and less power consumption

FAQ

Q. What is a core drill?

A. A core drill is a specialised tool for drilling through steel. Similar to a hole saw for wood, a core drill only cuts the outside edge of a hole. It produces accurate burr-free holes to close tolerances without pre-drilling or step drilling. It can drill a much larger hole and requires less force and time than a standard twist drill bit. As it turns, the drill produces chips from the outside cutting edges and after cutting the hole a ‘slug’ (a round chunk of steel from the centre of the cutter) falls out.

Q. Why is a core drill better than a jobber drill?

A. It's simply because they have superior hole-making capabilities. They can cut faster because they cut out a circle, rather than a hole. This same reason means that they have to do less work in every cut, meaning that they last longer, and drill holes with less power and torque. They also produce a better finish that is burr-free.

Q. What causes dull or broken core drills?

A. Dull or broken cutters are a common source of frustration with core drill users. It can be caused by multiple things. One cause of broken or prematurely dull core drills is a feed rate that is incorrect. To extend the life of your drill, you need to use the optimum feed rate for the material you’re cutting, the diameter of the cutter and the type of cutter. You should also maintain a firm and steady feed pressure during the cut to optimize performance. You’ll know you’re doing it correctly if you can hear the drill motor working and see long, stringy chips being pulled from the hole, forming a bird's nest around the cutter. On the other hand, if there are blue or purple chips while you’re cutting, it means that you’re not using enough coolant, or you’re pushing too hard.

Q. What is a pin?

A. A Pin is a large pencil-looking object that must be used when using a core drill. Pins go through the centre of the cutter, retracting up into the magnetic drill arbour as the hole is made. These ejector pins last a long time and can be used with multiple sizes of drills.

Q. Do I have to use coolant?

A. The short answer is yes, you should be using coolant with your core drills. That’s because coolant increases the tool life of a core drill dramatically. Coolant removes heat from the cut, but more importantly provides lubrication, reducing friction and allowing the cutting edge to remain sharp and efficient.